An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Velu Govindan; Sikiru Atanda; Ravi P. Singh; Julio Huerta‐Espino; Leonardo Abdiel Crespo‐Herrera; Philomin Juliana; Suchismita Mondal; Arun K. Joshi; Alison R. Bentley
Triticum aestivum; biofortification; corn; crossing; cultivars; genetic correlation; genetic improvement; grain yield; iron; spring wheat; transgressive segregation; yield components; zinc; South Asia
Abstract:
... Estimation of the rate of genetic gain over time allows quantification of breeding progress. Here we report on the rate of grain yield and zinc (Zn) concentration increase over 11 yr of targeted wheat (Triticum aestivum L.) biofortification breeding at the International Maize and Wheat Improvement Center (CIMMYT). Data from yield trials evaluated across multiple locations in South Asia and beyond ...
... The chrysanthemum is one of the most economically important ornamental plants in the Asteraceae family. Unfortunately, the efficacy of breeding through the traditional crossing in this species is highly limited due to inefficient seed setting. Therefore, this study aimed to investigate the effect of parental components and crossing frequency on the set and germination of chrysanthemum seeds. For t ...
... Conventional crossing of stenospermocarpic grapes for the obtainment of seedless cultivars presents some technical constraints causing embryo abortion in the early berry developmental stages. Embryo rescue technique partially overcomes these limitations, but the obtainment of viable plantlets relies on the optimization of several genetic and methodological issues. This work aimed to regenerate via ...
... Crop wild relatives (CWRs) are an important source of genetic diversity for crop improvement. The aim of this study was to assess the usefulness of deploying CWRs in durum wheat [Triticum turgidum L. subsp. durum (Desf.) van Slageren] breeding. A set of 60 accessions was selected to include cultivars from nine countries, top lines obtained via elite‐by‐elite crossing, and CWR‐derived lines. These ...
Long Thien Tran; Anh Tuan Nguyen; Minh Hong Nguyen; Long Tien Nguyen; Minh Thi Nguyen; Lai Thi Trinh; Dieu-Thuy Thi Tran; Sang Viet Ta; Ken Hoshikawa; Koichi Sugimoto; Hiroshi Ezura
brix; crossing; cultivars; fruit weight; fruit yield; leaves; mutants; mutation; parthenocarpy; pericarp; pollen; potatoes; self-pollination; tomatoes
Abstract:
... A number of different strategies have been utilized to introduce parthenocarpy into tomato commercial cultivars. In this study, we evaluated three segregating populations (F₂, F₃, and F₄) derived from conventional crossing between iaa9-3 mutant in Micro-Tom and an inbred pure tomato line V62. The mutation caused potato leaf style and high parthenocarpic fruit set ratio (nearly 90%). Introducing ia ...
... KEY MESSAGE: SSRs related to parent selection of D. kaki were validated by transcriptome sequencing, and genetic diversity of these markers among 76 persimmon germplasm resources was additionally investigated. The selection of hybrid parents is critical in cross-breeding plants for germplasm innovation and cultivating improved varieties. This study used a published RNA-Seq database of a persimmon ...
... Hippeastrum sp. is a popular cut flower and a popular potted plant, currently occupying the 11ᵗʰ position among cut flowers sold on the Dutch flower auctions. Hippeastrum × chmielii was bred by Henryk Chmiel at the Warsaw University of Life Sciences (WULS), Poland. The aim of this study was designed to test the ability of two clones of H. × chmielii to reproduce generatively by pollinating by thre ...
... Faba bean (Vicia faba L.) is a grain legume widely cultivated in many countries for food and animal feed. The faba bean stem borer (Lixus algirus L.) (Coleoptera: Curculionidae) is considered one of the major biotic stresses of faba bean in some Mediterranean areas, including Morocco. The use of genetic resistance is the most economical and environmentally friendly control method of insect pests. ...
Glycine max; agronomy; cluster analysis; crossing; cultivars; discriminant analysis; genetic background; genetic traits; genetic variation; genome; genotyping; grain yield; multidimensional scaling; population structure; single nucleotide polymorphism; soybeans; Sub-Saharan Africa
Abstract:
... Soybean productivity in sub-Saharan Africa (SSA) is less than half of the global average yield. To plug the productivity gap, further improvement in grain yield must be attained by enhancing the genetic potential of new cultivars that depends on the genetic diversity of the parents. Hence, our aim was to assess genetic diversity and population structure of elite soybean genotypes, mainly released ...
... Ethiopia is one of the centers of genetic diversity of sesame (Sesamum indicum L.). The sesame genetic resources present in the country should be explored for local, regional, and international genetic improvement programs to design high-performing and market-preferred varieties. This study’s objective was to determine the extent of genetic variation among 100 diverse cultivated sesame germplasm c ...
... Sclerotinia stem rot is one of the utmost important disease of mustard, causing considerable losses in seed yield and oil quality. The study of the genetic and proteomic basis of resistance to this disease is imperative for its effective utilization in developing resistant cultivars. Therefore, the genetic pattern of Sclerotinia stem rot resistance in Indian mustard was studied using six generatio ...
... Lettuce (Lactuca sativa) is one of the most economically important vegetables in the United States, with approximately 50% of the domestic production concentrated in the Salinas Valley of California. Verticillium wilt, caused by races 1 and 2 of the fungal pathogen Verticillium dahliae, poses a major threat to lettuce production in this area. Although resistance governed by a single dominant gene ...
... BACKGROUND: In temperate rice cultivation regions, japonica rice cultivars are grown preferentially because consumers deem them to have good eating quality, whereas indica rice cultivars have high grain yields and strong heat tolerance but are considered to have poor eating quality. To mitigate the effects of global warming on rice production, it is important to develop novel rice cultivars with b ...
Triticum aestivum; agronomic traits; ancestry; chromosomes; concerted evolution; crops; crossing; cultivars; diploidy; domestication; early development; genes; genomics; genotyping; geographical distribution; haplotypes; intergenic DNA; landraces; single nucleotide polymorphism; single nucleotide polymorphism arrays; tetraploidy; wheat; China
Abstract:
... Common wheat (Triticum aestivum L.) is one of the most important crops because it provides about 20% of the total calories for humans. T. aestivum is an excellent modern species for studying concerted evolution of sub-genomes in polyploid species, because of its large chromosome size and three well-known genome donors. Establishment of common wheat genome reference sequence and development of high ...
... Fruit shape index (round shape) and seed size have important effects on pumpkin yield. To investigate these traits and to create the most desirable state, a cross was made between two pumpkin cultivars. This study aimed to estimate the main gene effects (additive, dominant and di-genic epistasis) and to determine the mode of inheritance for fruit shape and seed size by generation mean analysis. Si ...
... The low phytic acid (lpa) rice mutant Os-lpa-XS110-2, exhibiting OsMRP5 mutation-induced metabolic features (i.e. decreased levels of phytic acid and raffinose, and increased levels of amino acids and biogenic amine GABA), was crossed with two commercial rice cultivars. The inferior field emergence rate of the lpa mutant was significantly improved upon cross-breeding. The GC/MS-based metabolomics ...
Dichanthium annulatum; abiotic stress; agricultural sciences; crossing; cultivars; drought tolerance; forage; forage yield; genetic variation; germplasm; germplasm conservation; grasses; Australia; China; Cuba; Fiji; Haiti; India; New Guinea; Northern Africa; Puerto Rico; South East Asia
Abstract:
... Dichanthium annulatum is one of the dominant grasses of India, North Africa, Southeast Asia, China, Australia, Fiji, New Guinea, Cuba, Haiti and Puerto Rico. This drought-tolerant grass is an excellent fodder in mixed pastures. Developing varieties with improved quality and tolerance to various abiotic stresses is hampered due to its apomictic nature. Germplasm collection, characterization, geneti ...
Ziziphus jujuba; crossing; cultivars; fruit morphology; fruits; probability
Abstract:
... The embryo abortion rate of Ziziphus jujuba Mill. ‘Zhongqiusucui’ is high, which hinders cross-breeding. Research to identify the causes of embryo abortion is urgently required. To determine the embryo abortion pattern and create a foundation for further research, the embryo abortion characteristics of Z. jujuba Mill. ‘Zhongqiusucui’ were observed during this study. The results indicated that Z. j ...
... The aim of this research was to overcome abortion postzygote incompatibility, and rescuing of hybrid embryos of early and mid-ripening plum cultivars, obtained from interspecific crossing between two plum cultivars (P. salicina L.) as female parents with four apricot cultivars (P. armeniaca L.) as male parents. The effects of cultivar, embryo developmental stage, plant growth regulators (PGRs), co ...
... Potato (Solanum tuberosum L.) and sweetpotato (Ipomoea batatas L.), which are nutritionally and commercially important tuberous crops, possess a perplexing heredity because of their autopolyploid genomes. To reduce cross‐breeding efforts for selecting superior cultivars from progenies with innumerable combinations of traits, DNA markers tightly linked to agronomical traits are required. To develop ...
... Potato virus Y (PVY) disrupts healthy seed potato production and causes tuber yield and quality losses globally. Its subdivisions consist of strain groups defined by potato hypersensitive resistance (HR) genes and whether necrosis occurs in tobacco, and phylogroups defined by sequencing. When PVY isolate PP was inoculated to potato cultivar differentials with HR genes, the HR phenotype pattern obt ...
... Horseradish cultivars are highly heterozygous clones and are maintained through asexual propagation, using root cuttings. For many years, horseradish was believed to be sterile and therefore impossible to improve by traditional sexual crosses. Prior to the 20th century, the only way to improve horseradish was to select and plant root cuttings from the most desirable plants. Moreover, the developme ...
Ramon de Moraes; Marcelo Vivas; Derivaldo Pureza da Cruz; Renato Santa-Catarina; Rafael Nunes de Almeida; Yure Pequeno de Souza; Rogério Figueiredo Daher; Alexandre Pio Viana; Messias Gonzaga Pereira
... Papaya has a narrow genetic base concerning disease resistance, with few genetically distinct cultivars for planting in the world. Losses in crop production caused by fungal and viral diseases, added to the absence of resistant cultivars available to producers, have reduced the competitiveness of crops. Therefore, this study aimed to select promising individuals for resistance to phoma spot and bl ...
... Previously we identified a major cotton fiber strength QTL (qFS-c7-1) on chromosome A07 using a multi-parent advanced generation intercross (MAGIC) population. To assess the stability and transferability of this QTL and its utility in cotton breeding, we made ten new populations. These populations were developed from crosses between MAGIC recombinant inbred lines, or between cotton cultivars that ...
... Pathogens and pests are one of the major threats to agricultural productivity worldwide. For decades, targeted resistance breeding was used to create crop cultivars that resist pathogens and environmental stress while retaining yields. The often decade-long process of crossing, selection, and field trials to create a new cultivar is challenged by the rapid rise of pathogens overcoming resistance. ...
... Intensive breeding programmes have been carried out to obtain high‐quality seedless grape cultivars. Seedless grape cultivars were used as pollinizer parents, but the number of hybrid seeds and the viability of the seed obtained could differ greatly. In this study, carried out over 3 years, the results obtained from crossing with some pollinizer cultivars belonging to different Vitis species were ...
... Background. The presented information refers to the completed stage of the breeding process carried out at the Institute of Agrobiotechnologies (Syktyvkar) that led to the development of a new mid-early table potato variety – ‘Vychegodsky’. This cultivar was obtained from controlled crossing of cvs. Svitanok Kievsky × Amadeus. The new variety underwent a comprehensive assessment for the main agron ...
... Powdery mildew is a fungal disease that threatens wheat production throughout the world. Breeding resistant cultivars is an effective way to reduce harm caused by powdery mildew. In this study, 35 wheat-Psathyrostachys huashanica-derived lines were developed by crossing common wheat and P. huashanica Keng (2n = 2x = 14, NsNs) using embryo culture. Resistance to powdery mildew in the derived lines ...
... Fruit-tree breeding is a lengthy process with many limitations. Classical breeding strategies using conventional cross-breeding and induced mutations have played an important role in the development of new cultivars in fruit trees. Precise genome editing could be a very useful supplementary tool for the improvement of crop plants. Various genome editing techniques including ZFNs, TALENs, and most ...
agricultural research; crossing; cultivars; fruits; hybrids; research institutions; tomatoes
Abstract:
... Tomato is the most common vegetable species of the Solanaceae family both in the World and in Turkey. The Aegean Agricultural Research Institute's tomato breeding program is carried out for developing new processing tomato cultivars. Processing tomato breeding lines resistant to some diseases and pests have been obtained by taking into account the demands of tomato processing companies, farmers of ...
... The breeding of new stenospermocarpic seedless grape cultivars is of particular importance to the growing table grape market and grape processing industry. However, the developmental and genetic architectures of soft‐seed and seedlessness traits are unclear. In this study, we performed anatomical, histochemical and gene expression analyses to characterize the morphological and genetic basis of the ...
... BACKGROUND: Productivity of cowpea [Vigna unguiculata (L.) Walp] in sub-Sahara Africa is curtailed by a lack of farmer-preferred and improved cultivars and modern production technologies. The objectives of the study were to determine the extent of genetic diversity present among a collection of cowpea accessions from Zambia and Malawi using phenotypic traits and single nucleotide polymorphism (SNP ...
... Alfalfa is planted in more than 30 million hectares worldwide, but despite its popularity in temperate regions, it is not widely grown in subtropical agroecosystems. It is critical to improve alfalfa for such regions, considering current predictions of global warming and the increasing demands for animal-based products. In this study, we examined the diversity present in subtropical alfalfa germpl ...
crossbreds; crossing; cultivars; fruiting bodies; internal transcribed spacers; mitochondrial DNA; mushrooms; polymerase chain reaction; restriction fragment length polymorphism; East Asia
Abstract:
... Pleurotus tuoliensis (Bailinggu) is a precious mushroom species cultivated industrially in eastern Asia. The long cropping cycle, high deformity rate, and low yield are the major bottlenecks for its widespread cultivation. There is thus a need for improved P. tuoliensis cultivars. In the present study, interspecific crossing of monokaryons between P. tuoliensis and P. eryngii was carried out. Six ...
... Grape ripe rot is a fungal disease, which is almost inextinguishable particularly before and after harvest in most vineyards. The management of this disease largely depends on the breeding of resistant varieties. Thus, the search for resistant varieties should parallel the molecular analysis of the markers associated with disease resistance. Here, we tested the leaf inoculation assay of Colletotri ...
Oryza rufipogon; Oryza sativa; alleles; amino acids; breeding programs; crossing; cultivars; direct seeding; genetic variation; genotyping; germination; haplotypes; isogenic lines; parents; plant breeding; production technology; quantitative trait loci; rice; temperature
Abstract:
... BACKGROUND: Rice (Oryza sativa L.) is generally sensitive to low temperatures, and in production systems that use direct-seeding, low-temperature germinability (LTG) is a desired trait. Previously, the QTLs, qLTG1 and qLTG3, that control LTG, were mapped using the BC₄F₈ population, which is a cross of Korean elite cultivar Hwaseong and O. rufipogon (IRGC 105491). We have characterized and analyzed ...
Cydonia oblonga; Erwinia amylovora; breeding programs; control methods; crossing; cultivars; disease resistance; fire blight; fruit growing; genotype; germplasm; greenhouses; plant breeding; quinces; rootstocks; statistical analysis; virulence; Turkey (country)
Abstract:
... Fire blight (Erwinia amylovora) is one of the biggest challenges in the production of quince (Cydonia oblonga Mill.) in Turkey, and the lack of effective control methods emphasizes the need for resistant varieties of this species; therefore, testing the susceptibility levels of the germplasm is necessary to create breeding programs that ensure resistance to this disease. The aim of our study was t ...
... Pea (Pisum sativum) is an important grain legume worldwide whose cultivation is severely constrained by the root parasitic weed crenate broomrape (Orobanche crenata), which is widespread in the Mediterranean Basin and Middle East. No resistance is available in commercialized cultivars but some levels of incomplete resistance has been reported in pea landraces and Pisum spp. relatives. In this pape ...
... KEY MESSAGE: A fluorescent protein visualized distributions of cell layers in floral organs of chrysanthemum using transgenic periclinal chimeras carrying a gene encoding a fluorescent compound. Plant meristems have three cell layers: the outermost layer (L1), the second layer (L2), and the inner layer (L3). The layers are maintained during development but there is limited knowledge of the details ...
Luís Guilherme F. de Abreu; Maria Carolina B. Grassi; Lucas M. de Carvalho; Jovanderson J.B. da Silva; Juliana V.C. Oliveira; José A. Bressiani; Gonçalo A.G. Pereira
... Sugarcane (Saccharum spp.) grows in all tropical and subtropical regions of the world, being cultivated in more than 100 countries. Modern cultivars are the results of interspecific crosses, having S. officinarum as the main genetic source, which results in high sucrose production. Energy cane is still a less rigorous definition, applied to cane cultivars that have higher biomass, although lower s ...
Adriano dos Santos; Antônio Teixeira do Amaral Júnior; Samuel Henrique Kamphorst; Gabriel Moreno Bernardo Gonçalves; Pedro Henrique Araújo Diniz Santos; Janieli Maganha Silva Vivas; Gabrielle Sousa Mafra; Shahid Khan; Fabio Tomaz de Oliveira; Kátia Fabiane Medeiros Schmitt; Divino Rosa dos Santos Junior; Freddy Mora
... The global boom in agricultural production has been associated with the exponential increase of nitrogen (N) fertilizer application. This heavy use of nitrogen in agriculture has caused negative impacts on the environment. Therefore, new alternatives are needed to maintain or increase maize yield but reduce the environmental impact. For this purpose, one possibility is to plant N-use efficient (NU ...
... BACKGROUND: Brassica napus provides approximately 13–16% of global vegetable oil for human consumption and biodiesel production. Plant height (PH) is a key trait that affects plant architecture, seed yield and harvest index. However, the genetic mechanism of PH in B. napus is poorly understood. RESULTS: A dwarf mutant df59 was isolated from a large-scale screening of an ethyl methanesulphonate-mut ...
Bayesian theory; Rubus occidentalis; chromosome mapping; chromosomes; crossing; cultivars; factor analysis; fruit quality; genes; genetic analysis; genetic improvement; genetic variation; genome assembly; genomics; genotype; genotype-environment interaction; genotyping by sequencing; germplasm; horticulture; pedigree; plant breeding; quantitative trait loci; United States
Abstract:
... U.S. black raspberry (BR) production is currently limited by narrowly adapted, elite germplasm. Improved understanding of genetic control and genotype-by-environment interactions (GEI) of pomological traits will inform the development of improved BR germplasm and cultivars. To this end, analysis of a multi-environment trial of two BR mapping populations derived from crosses of commercial cultivars ...
... True seed of shallot (TSS) from open pollination crossing are in the heterogenous as a result of the heterozygous parents. This condition gives the opportunity to obtain new selected accession through the genetic variations of their seedlings. Five TSS cultivars of Biru Lancor, Pancasona, Tuk-Tuk, Lokananta, Sanren were used as planting materials to be evaluated the growth and bulb yield performan ...
... Powdery mildew (Blumeria graminis) is a major fungal disease of barley causing economical yield losses worldwide. Breeding for resistance to this disease is crucial due to the rapid change in pathotype patterns of B. graminis in fields. In the present work, powdery mildew-resistant barley germplasm was developed by crossing four cultivars currently used in Europe and West Asia. Out of 265 doubled ...
... BACKGROUND: Rice sheath blight (ShB) disease, caused by the pathogenic fungus Rhizoctonia solani, causes significant yield losses globally. US weedy rice populations, which are de-domesticated forms of indica and aus cultivated rice, appear to be more resistant to ShB than local japonica cultivated rice. We mapped quantitative trait loci (QTL) associated with ShB resistance using two F₈ recombinan ...
... To locate quantitative trait loci (QTLs) resistant to powdery mildew (Erysiphe), a major disease of red clover, 151 red clover hybrids from crosses between genotypes from a resistant (Ganong PR1) and a susceptible (Minshan) cultivar were used as the mapping population. A genetic linkage map of red clover was constructed, and 30 plants with disease severity levels on a scale of one to nine, were us ...
... An unusual 5-Small Leaflet mutant plant was found within the 'Georgia Green' runner-type peanut (Arachis hypogaea L.) cultivar. Subsequent selfing has not established a true-breeding 5-Small Leaflet genotype. It continues to segregate normal and 5-Small Leaflet plants but with a reduced number of normal leaf plants upon selection for 5-Small Leaflet phenotypes after several self-generations. F1, F ...
... Hybrid vigor has been demonstrated in the early 20th century after hybrid corn was invented. Procedures to breed hybrid cultivar are more complex than breeding open-pollinated cultivars or pure lines. Hybrid cultivars are most often based on the crossing of two true breeding lines that should genetically complement each other. This complementarity of genotypes of genetically different parental lin ...
... Water deficit (WD) leads to significant phenotypic changes in crops resulting from complex stress regulation mechanisms involving responses at the physiological, biochemical and molecular levels. Tomato growth and fruit quality have been shown to be significantly affected by WD stress. Understanding the molecular mechanism underlying response to WD is crucial to develop tomato cultivars with relat ...