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... SynopsisShoot and root development of Coastal Bermuda rhizomes was superior to that of Suwanee bermuda. IBA (3-indolebutyric acid) improved shoot development and rooting of Suwanee. IBA increased rooting of Coastal but had no effect on shoot development of Coastal or Midland bermuda. ...
... Establishment of newly planted grasses for turf is influenced by weed competition. Since herbicides may reduce weed competition during the establishment period, an experiment was initiated to determine the effects of minimal vs. no herbicide treatment during the establishment of four turfgrass varieties and species. Herbicides as preemergence treatments were applied immediately after sprigging to ...
... Perennial grasses can be grown in subtropical areas of the world having little frost damage, but, in many areas low temperatures (1 to 10 C) at higher elevations and lack of moisture may restrict growth of most subtropical forages and create critical feed shortages for livestock. A study of the seasonal distribution of forage production of subtropical grasses was conducted to determine production ...
... Livestock production potentials in tropical areas are often unattainable because of limited availability of good quality herbage. Rates of herbage growth and lignification are high resulting in production of poor quality herbage during the rainy season and severe herbage scarcity during the dry season. Factors other than depleted soil moisture, which may contribute to the decreased production in t ...
... Annual bluegrass (Poa annua L.) is a major weed in bermudagrass (Cynodon spp.) golf greens overseeded with cool-season grasses. Herbicides are often ineffective or may injure the overseeded grass. This study was initiated to determine the effects of sequential vertical mowing and ethofumesate [(±)-2-ethoxy-2,3-dihydro-3,3-dimethyl- 5-benzofuranyl methanesulfonate)] treatments on a bermudagrass gre ...
... Near infrared reflectance spectroscopy (NIRS) has been used for the rapid chemical analysis of feed. This research investigated the use of NIRS to analyze total nonstructural carbohydrate (TNC) concentration in stem bases and roots of Cynodon, Hemarthria, Digitaria, and Paspalum tropical grasses from six experiments. Conventional TNC analysis was conducted and NIRS equations were developed from se ...
... Chilling temperatures (10 to 15 °C down to 0 °C) disrupt photosynthesis, reduce growth, and discolor bermudagrass (Cynodon spp.) turf. We studied the effects of chilling in controlled environments on the CO₂ exchange rate (CER), total nonstructural carbohydrate (TNC) content, amylolytic enzyme activity (AEA), chlorophyll content, and turf color in two bermudagrasses to determine the influence of i ...
... Root hairs have been shown to absorb water and nutrients; thus, it may be important to characterize their quantity, size, and viability when studying components of drought resistance. The first objective was to find the most effective and precise vital stain for root hairs of warm-season perennial grasses. Sprigs of 12 genotypes representing six species were grown in sand culture in the greenhouse ...
... Spring dead spot (SDS) (Gaeumannomyces graminis (Sate.) Arx & Olivier var. graminis) is a serious disease of intensively managed bermudagrass (Cynodon spp.) turf throughout much of the world. Research was undertaken in North Carolina to determine (i) if exposure of previously G. graminis infected turf to low temperatures would result in the reduced bermudagrass regrowth; and (ii) if shoot regrowth ...
... A reliable technique is needed to facilitate the identification of cultivars of turf-type Cynodon species because of difficulties encountered using morphological traits alone. This study was conducted to determine the potential for using starch gel electrophoresis to identify 21 Cynodon genotypes. Six enzyme systems (aconitase, alcohol dehydrogenase, phosphoglucomutase, phosphoglucoisomerase, shik ...
... Triazines have potential for use as slow-release N fertilizers. Their degradation by microbial activity and subsequent N mineralization rate is reduced in less microbially active soils. The objective of this study was to determine the influence of Pseudomonas inoculant on the efficacy of triazine fertilizers. Turf response to ammeline (4,5-diamino-1,3,5-triazin-2(lH)-one) and melamine (1,3,4-triaz ...
... Simple and cost-effective procedures for predicting forage quality are needed. The objective of this study was to determine if dry matter concentration (DMC) could be used as an index of in vitro dry matter disappearance (IVDMD)in bermudagrass (Cynodon spp.). Data were from two bermudagrass trials at Tifton, GA. The 1983 and 1985 trials contained 32 and 28 entries replicated five times. Plots were ...
Cynodon; Agrostis stolonifera var. palustris; Stenotaphrum secundatum; lawns and turf; salt tolerance; screening; nutrient solutions; salinity; culture media; sodium chloride; in vitro culture; cultivars; germplasm
Abstract:
... New methods for assessing salinity responses of turfgrass lines are required to identify selections for use on marginal sites. This study was conducted to quantify whole turfgrass plant responses to salt in solution-culture and microculture test environments, and to evaluate the latter as an alternative system for identifying salt-resistance characteristics. Paired cultivars of bermudagrass (Cynod ...
... Bermudagrass (Cynodon spp.) putting greens are overseeded with cool-season grasses in the fall to maintain a high-quality putting turf throughout the southern USA. Perennial ryegrass (Lolium perenne L.) has been the predominant grass used for overseeding until recently, when roughstalk (Poa trivialis L.) has been increasingly used for overseeding. Annual bluegrass (Poa annua L.) is a problem winte ...
potassium fertilizers; hybrids; crop quality; application timing; Cynodon transvaalensis; Cynodon dactylon; nitrogen; chemical constituents of plants; carbohydrates; lawns and turf; potassium; color; rhizomes; phosphorus; application rate; leaves; nitrogen fertilizers
Abstract:
... Late-season application of N to bermudagrass (Cynodon dactylon x transvaalensis Burtt-Davey) putting greens are often made in an attempt to extend turfgrass growth and color. Research was conducted to evaluate the physiological and morphological response of bermudagrass to late-seasoanp plicatioonf N and K. Application of 0, 4.9, and 9.8 g Nm⁻¹ in factorial combination with 0, 4.1, or 8.2 g Km⁻¹ w ...
... We have used DNA amplification fingerprinting (DAF) to study the genetic variation of bermudagrass (Cynodon) species and cultivars of interspecific crosses that exhibit leaf-blade textural characteristics ranging from coarse to fine. Arbitrary octamer primers produced complex and reproducible amplification profiles with high levels of polymorphic DNA. Phylogenetic analysis using parsimony (PAUP) a ...
... Widespread use of relatively few clonally-propagated turf bermudagrass (Cynodon spp. Rich.) cultivars in the USA creates a high risk for extensive damage from new pests. Knowledge of the genetic diversity within Cynodon, and access to that diversity would be important in counteracting pest epidemics. This paper reviews information on the distribution and cytotaxonomic diversity of Cynodon turfgras ...
... Water-use data obtained under the climatic and soil conditions typical of the southeastern USA are very limited. Seven of the most commonly used turfgrasses in the Piedmont region of the humid Southeast were evaluated in a field study under edaphic stresses common to the region for seasonal evapotranspiration (ET) and development of Class A weather pan coefficients (kp) and FAO Penman crop coeffic ...
... Degree-day modeling applications in turfgrass management have recently seen increased interest. The predictive capacity of any degree day model is dependent on an accurate determination of the basal growth temperatures for the species under consideration. The objective of this study was to determine basal growth temperatures and growth rate constants for eight warm season turfgrasses (five species ...
potassium fertilizers; hybrids; cultivars; correlation; application rate; Cynodon dactylon; chemical constituents of plants; Cynodon transvaalensis; stolons; carbohydrates; air temperature; seasonal variation; rhizomes; roots; shoots; Alabama
Abstract:
... Stored nonstructural carbohydrates are a primary source of reserve energy in vegetative organs of warm-season grasses. Research is needed concerning the influence of potassium on carbohydrate levels in turfgrasses. Four K rates ranging from 24 to 390 kg ha⁻¹ per growing month were applied twice monthly from 1992 to 1994 to ‘Tifdwarf’ and ‘Tifway’ bermudagrasses [Cynodon dactylon (L.) Pers. × C. tr ...
... Sodium dodecylsulfate (SDS) polyacrylamide gel electrophoresis (PAGE) and fluorography of in vivo radiolabeled proteins has revealed that protein synthesis in crowns of ‘Midiron’ and ‘Tifgreen’ bermudagrasses (Cynodon dactylon L. Pers. × C. transvaalensis Burtt-Davy) is altered in association with cold acclimation (CA). Increased synthesis of some proteins in association with CA in Midiron crowns ...
Eremochloa ophiuroides; wilting; hybrids; Zoysia japonica; Festuca arundinacea; crop quality; Cynodon dactylon; Cynodon transvaalensis; spatial distribution; drought tolerance; lawns and turf; chlorosis; Stenotaphrum secundatum; roots; shoots; Southeastern United States
Abstract:
... Knowledge of relative drought resistance is important for selecting turfgrasses that persist during drought stress. Seven of the most commonly used turfgrasses in the Piedmont region of the humid Southeastern USA were evaluated in a field study under edaphic stresses common to the region for drought resistance and spatial rooting responses as a component of drought avoidance. Grasses were ‘Tifway’ ...
... Applications of high rates of potassium are often made in an attempt to increase winter hardiness of bermudagrass [Cynodon dactylon (L.) Pers.] turfs. Research was conducted to evaluate two bermudagrass cultivars field-grown on a high sand based soil mix and a native soil for the influence of applied K on cold resistance. A field study with six K rates ranging from 0 to 390 kg ha⁻¹ growing month⁻¹ ...
Cynodon; genetic distance; nucleotide sequences; DNA fingerprinting; cultivar identification; genetic polymorphism; Australia
Abstract:
... Arbitrary primed polymorphic DNA was employed to investigate relationships among 18 Cynodon cultivars available in Australia. Thirteen out of the 20 random primers screened gave reproducible banding patterns for all samples. The cultivars showed a high level of polymorphism. Each cultivar was readily distinguishable with a combination of primers. One primer was able to discriminate between all the ...
Cynodon; cultivars; hybrids; clonal variation; ancestry; lawns and turf; genetic stability; DNA fingerprinting; interspecific hybridization
Abstract:
... DNA amplification fingerprinting (DAF) with arbitrary oligonucleotide primers can specify genetic relationships between closely related plant accessions. In this study, DAF was used to characterize bermudagrass (Cynodon) species and cultivars of interspecific crosses, evaluate genetic diversity and origin of bermudagrass off-types, and certify authenticity of cultivar stocks. Arbitrary octamer pri ...
... Rooting characteristics of ‘Midlawn’ bermudagrass [Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt-Davy], ‘Prairie’ buffalograss [Buchloe dactyloides (Nutt.) Engelm.], ‘Meyer’ zoysiagrass (Zoysia japonica Steud.), and ‘Mustang’ tall rescue (Festuca arundinacea Schreb.) are not well documented, but likely contribute to drought avoidance. Experiments were conducted between 1993 and 1995 to det ...
... Natural reseeding of subterranean clover (Trifolium subterraneum L.) grown with a warm-season grass in the southern USA depends on the proper softening rate of hard seed. Three experiments were each conducted over 2 yr to determine (i) the rate of seed softening, (ii) the cause of reduction in seed softening over time, and (iii) the effect of clipping management on seed softening. In all experimen ...
... New polymer coatings have been developed and used to coat sulfurcoated urea (SCU) and other core N materials. These polymer-coated S-coated ureas (PCSCU) and polymer-coated S-coated N-P-K fertilizers (PCSCF) require evaluation for their N-release properties turfgrass culture. Also, N carriers from three different classes of N sources were included: polymer-coated urea (PCU), ureaformaldehyde (UF) ...
... Field and greenhouse studies were conducted to evaluate the resistance of seed- and vegetatively propagated bermudagrass entries (Cynodon spp.) to spring dead spot caused by Ophiosphaerella herpotricha. In Kansas greenhouse studies, O. herpotricha caused root discoloration and root weight reductions in all entries tested. However, in Kansas field plots, root weight reductions were not different am ...
... The genus Cynodon (Gramineae), comprised of 9 species, is geographically widely distributed and genetically diverse. Information on the amounts of molecular genetic variation among and within Cynodon taxa is needed to enhance understanding of phylogenetic relations and facilitate germplasm management and breeding improvement efforts. Genetic relatedness among 62 Cynodon accessions, representing ei ...
... Multispectral radiometry provides a method for assessing plant light reflectance in the visible and near-infrared ranges. Reflectance of narrow wavelength ranges as well as ratios of different ranges have been highly correlated with absorbency of photosynthetically active radiation, leaf area index (LAI), and plant response to stresses. The objectives of this research were to determine if data obt ...
... Seashore paspalum (Paspalum vaginatum Swartz) displays wide intraspecific diversity and exhibits tolerance to numerous abiotic stresses. In addition, comparatively low fertility requirements and high quality growth characteristics of many ecotypes render this grass a prospective candidate for use on golf courses, athletic fields, and landscaped areas in warm climates worldwide. The objectives of t ...
manganese; turgor; hybrids; lignocellulose; hemicellulose; Cynodon transvaalensis; Cynodon dactylon; Paspalum vaginatum; cellulose; magnesium; mechanical damage; water content; potassium; field experimentation; chemical constituents of plants; traffic; lignin; shoots; Georgia
Abstract:
... Traffic causes shoot injury to turfgrass, with resulting inhibition of growth and reduction of quality. Turfgrasses in high traffic venues are generally selected for tolerance to traffic or for an ability to quickly outgrow the injury. However, limited knowledge exists on the mechanisms that impart wear tolerance to turfgrass, particularly for warm-season grasses. This field research was undertake ...
... Turfgrass fertilizers often contain approximately one-half as much potassium (K) as nitrogen (N), on a weight basis. Since K fertilization has been shown to be very beneficial for turfgrass appearance and growth, higher rates of K fertilization, relative to N, have been suggested. The effect of K/N fertilization ratios on 'Tifgreen' bermudagrass [Cynodon dactylon (L.) Pers. X C. transvaalensis Bur ...
... Research on the gibberellic acid (GA)-inhibiting plant-growth regulator (PGR) trinexapac-ethyl (TE) regarding seasonal effects of single vs. multiple applications of this product on turfgrass quality and tissue production has not been reported. Research was conducted at North Carolina State University on 'Tifway' bermudagrass [Cynodon dactylon (L.) Pers. X Cynodon transvaalensis (Burtt-Davy)] to c ...
... Long-term maintenance of genetic fidelity of clonally propagated bermudagrass (Cynodon spp.) cultivars is difficult. Contamination may arise through mechanical mixtures, the presence of viable seed, and somatic mutations. DNA amplification fingerprinting (DAF) was used to compare genetically putative 'U-3' bermudagrass [Cynodon dactylon (L). Pers.] selected in the early 1930s with bermudagrass cur ...
... Irrigation scheduling systems which estimate actual evapotranspiration (ETa) by adjusting reference evapotranspiration (ETo) with crop coefficients (K(c)s) have been suggested as a means of improving irrigation management of turfgrass in the desert southwest. The objective of this study was to develop turfgrass K(c)s for use with ETo computed by the Penman Monteith Equation recommended by the Unit ...
cultivars; application timing; Cynodon transvaalensis; Cynodon dactylon; relative humidity; mowing; Lolium perenne; air temperature; heat; seasonal variation; propyzamide; plant competition; field experimentation; golf courses; density; ammonium nitrate; mortality; North Carolina
Abstract:
... Turfgrass managers in the southeastern United States often overseed 'Tifway' bermudagrass [Cynodon transvaalensis Burtt-Davey x C. dactylon (L.) Pers.] with perennial ryegrass (Lolium perenne L.) to provide a dense green turf during winter months. Although overseeding provides benefits, the spring transition from perennial ryegrass to bermudagrass can be troublesome and inconsistent. Perennial rye ...
... Bermudagrasses, Cynodon spp., periodically sustain winter injury in the transition zone between warm- and cool-season turfgrasses. Our objective was to determine relative freeze tolerance levels of advanced lines, recently released cultivars, and standard varieties by means of laboratory-based methodology. Freeze tolerance evaluations were divided into three groups on the basis of intended use. Th ...
Cynodon; cultivars; seeds; vegetative propagation; frost resistance; sexual reproduction; genotype
Abstract:
... Bermudagrasses, Cynodon spp., periodically sustain winter injury in the transition zone between warm- and cool-season turfgrasses. Our objective was to determine relative freeze tolerance levels of advanced lines, recently released cultivars, and standard varieties by means of laboratory-based methodology. Freeze tolerance evaluations were divided into three groups on the basis of intended use. Th ...