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You searched for: Publication year rev 8022-1978 Remove constraint Publication year rev: 8022-1978 Subject hybrids Remove constraint Subject: hybrids
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1. Analysis of a hybrid swarm between Acacia brachybotrya and A. calamifolia (Leguminosae)

Author:
LEACH, G.J.; WHIFFIN, T.
Source:
Botanical journal of the Linnean Society 1978 v.76 no.1 pp. 53-69
ISSN:
0024-4074
Subject:
Acacia; backcrossing; flavonoids; hybridization; hybrids; parents; plant ecology; pollen
Abstract:
... A hybrid swarm between Acacia brachybotrya and A. calamifolia, involving plants referable to A. grayana, was studied in detail. Plants representing the range of variation found within the hybrid swarm were examined morphologically, chemically and ecologically in an attempt to document hybridisation and to determine their status. Plants referable to A. grayana are confirmed as hybrids, and other in ...
DOI:
10.1111/j.1095-8339.1978.tb01498.x

2. Breeding Potentials of Noncultivated Cottons. IV. Location and Parental Effects on Agronomic Characters and Fiber Properties in Hybrids

Author:
F. D. Wilson; R. L. Wilson
Source:
Crop science 1978 v.18 no.3 pp. 467-471
ISSN:
0011-183X
Subject:
Gossypium hirsutum; Pectinophora gossypiella; agronomic traits; bolls; cotton; cultivars; fiber quality; genetic variation; heterosis; hybrids; inheritance (genetics); insecticides; Arizona
Abstract:
... We studied the inheritance of six agronomic characters and five fiber properties in Ft hybrids between two cultivars and eight primitive race stocks of cotton, Gossypium hirsutum L., in 1975 and between the same two cultivars and four other race stocks in 1976. Plants were grown at Phoenix, Ariz., where insecticides were applied as needed for control of pink bollworm, Pectinophora gossypiella (Sau ...
DOI:
10.2135/cropsci1978.0011183X001800030028x

3. Evaluation of Cassava Germplasm for Productivity

Author:
Kazuo Kawano; Pablo Daza; Alvaro Amaya; Mario Rios; Wania M. F. Goncalves
Source:
Crop science 1978 v.18 no.3 pp. 377-380
ISSN:
0011-183X
Subject:
Manihot esculenta; Oxisols; carbohydrates; cassava; climate; drought; farms; genetic improvement; germplasm; harvest index; hybrids; irrigation; rain; savannas; soil fertility; Colombia; Latin America
Abstract:
... A yield evaluation in single-row plots were made in Colombia of approximately 1,900 accessions of cassava (Manihot esculenta Crantz), collected throughout Latin America and 4,700 hybrid lines from crosses within the same germplasm. Superior genotypes were selected on the basis of harvest index (proportion of root weight to total plant weight) and root yield in single-row plots and then evaluated i ...
DOI:
10.2135/cropsci1978.0011183X001800030006x

4. Growth and Yield of Maize as Affected by Early-Season Defoliation

Author:
R. R. Johnson
Source:
Agronomy journal 1978 v.70 no.6 pp. 995-998
ISSN:
0002-1962
Subject:
Zea mays; corn; corn ears; defoliation; field experimentation; grain protein; grain yield; hybrids; leaf area; leaves; plant height; pollen; Corn Belt region; Illinois
Abstract:
... Complete defoliation of maize (Zea mays L.) at the five-leaf stage has been reported to increase the grain yield of early-season hybrids in the northern U.S. corn belt while similar treatments have generally reduced yields of full-season hybrids. The objective of this study was to extend this research to the central corn belt by measuring the effect of defoliation at the five-leaf stage on grain y ...
DOI:
10.2134/agronj1978.00021962007000060026x

5. Heterosis in Maize as Measured by K Uptake Properties of Seedling Roots

Author:
Hugh Frick; Loyal F. Bauman
Source:
Crop science 1978 v.18 no.1 pp. 99-103
ISSN:
0011-183X
Subject:
Zea mays; aeration; dent corn; heterosis; hybrids; seedlings
Abstract:
... The capacity of the primary root of maize (Zea mays L.) seedlings to rapidly alter K uptake rates appears to be of adaptive value to the plant, and is related physiologically to dent corn hybrid vigor. A causal relationship is not implied. K⁺(⁸⁶Rb) uptake rates of seedling roots were measured in freshly excised segments (basal K⁺ uptake rates) and in segments after 2 hours aeration in buffer (augm ...
DOI:
10.2135/cropsci1978.0011183X001800010026x

6. Interspecific Hybridization in Trifolium L. Section Trifolium Zoh. III. Partially Fertile Hybrids of T. sarosiense Hazsl. ✕ 4x T. alpestre L.

Author:
K. H. Quesenberry; N. L. Taylor
Source:
Crop science 1978 v.18 no.4 pp. 536-540
ISSN:
0011-183X
Subject:
Trifolium pratense; autotetraploidy; backcrossing; diploidy; florets; germination; greenhouses; hybrids; interspecific hybridization; pollen viability; pollination
Abstract:
... Interspecific hybrids of Trifolium sarosiense Hazsl. ✕ 2x and 4x T. alpestre L. were produced by hand pollination in a greenhouse. Pollinations of 530 florets of T. sarosiense (2n = 6x = 48) ✕ T- alpestre (2n = 2x = 16) and 806 florets of the reciprocal produced only five and 10 seeds, respectively. Plants grown from these seeds were weak and chlorotic, and all putative hybrids died before floweri ...
DOI:
10.2135/cropsci1978.0011183X001800040002x

7. Mating behaviour of glossina pallidipes austen (diptera, glossinidae): genetic differences in copulation time between allopatric population

Author:
JAENSON, THOMAS G.T.
Source:
Entomologia experimentalis et applicata 1978 v. no. pp. 100-108
ISSN:
0013-8703
Subject:
Glossina pallidipes; X chromosome; allopatry; autosomes; backcrossing; copulation; forests; genetic variation; hybrids; males; parents; Kenya
Abstract:
... Copulation duration of Glossina pallidipes from Lambwe Valley (0° 35′ S, 34° 15′ E) and Kibwezi Forest (2° 27′ S, 37° 55′ E) in Kenya, was investigated in the laboratory. The difference in mean copulation time between the populations was highly significant. Reciprocal copulations showed that the trait is predominantly or only determined by the male. F₁ and F₂ male hybrid durations were similar and ...
DOI:
10.1111/j.1570-7458.1978.tb02760.x

8. Minimum Sample Size for Estimating Progeny Mean and Variance

Author:
Kuo Kao Wu; Don J Heinz; Hans K. Meyer; Sheldon L. Ladd
Source:
Crop science 1978 v.18 no.1 pp. 57-62
ISSN:
0011-183X
Subject:
Saccharum; hybrids; progeny; refractive index; sample size; sugarcane; variance
Abstract:
... Minimum sample size is defined as the minimum number of individuals necessary to estimate, with reasonable precision, mean and variance of a trait in a population. Repeated random samples for various sample sizes were taken for each of four yield components in five sugarcane (Saccharum sp.) hybrid populations grown in two contrasting environments over 2 years in three selection stages. Means and v ...
DOI:
10.2135/cropsci1978.0011183X001800010016x

9. A New Approach to Soil Testing: III. Differential Adsorption of Potassium

Author:
W. L. Stout; D. E. Baker
Source:
Soil Science Society of America journal 1978 v.42 no.2 pp. 307-310
ISSN:
0361-5995
Subject:
Zea mays; adsorption; corn; exchangeable potassium; hybrids; potassium; regression analysis; soil; soil analysis
Abstract:
... Donnán type ratios were used to develop an index to account for the differential adsorption of K in two widely different soils of the Rayne and Hublersburg series. This index was used to calculate an adjusted K requirement for the soils using the approach of Baker. Three corn hybrids (Zea mays L.) were grown in the two soils treated with different levels of K and multiple regression analysis was u ...
DOI:
10.2136/sssaj1978.03615995004200020021x

10. Protein and Lysine Contents of Endosperm and Bran of the Parents and Progenies of Crosses of Common Wheat

Author:
K. P. Vogel; V. A. Johnson; P. J. Mattern
Source:
Crop science 1978 v.18 no.5 pp. 751-754
ISSN:
0011-183X
Subject:
Triticum aestivum; wheat; hybrids; transgressive segregation; progeny; cultivars; endosperm; wheat bran; protein content; amino acid composition
Abstract:
... Grain samples from parent and progeny rows of the common wheat (Triticum aestivum L.) crosses, ‘Nap Hal’/ ‘Atlas 66’ and Nap Hal/‘Super X’, were fractionated into their starchy endosperm and bran components to determine the within-kernel site of their variation in protein and lysine concentration. Nap Hal and Atlas 66 are highprotein wheats. Nap Hal also has elevated grain lysine content. Super ✕ ...
Handle:
10113/27634
DOI:
10.2135/cropsci1978.0011183X001800050014x

11. Seed Damage by Pink Bollworm to Race Stocks, Cultivars, and Hybrids of Cotton

Author:
F. D. Wilson; R. L. Wilson
Source:
Crop science 1978 v.18 no.3 pp. 465-467
ISSN:
0011-183X
Subject:
Gossypium hirsutum; Pectinophora gossypiella; antibiosis; cotton; cultivars; diet; genes; harvest date; hybrids; seed damage; Texas
Abstract:
... Noncultivated race stocks of cotton (Gossypium hirsutum L.) previously selected via diet bioassays for antibiosis to pink bollworm (Pectinophora gossypiella Saunders), were field-tested for resistance along with cultivars and race stock ✕ cultivar F₁ hybrids. No race stock or hybrid was consistently more resistant than the cultivars in 1975. In 1976, one race stock, Texas 40, and two hybrids showe ...
DOI:
10.2135/cropsci1978.0011183X001800030027x

12. Seed Size and Germination of Hulled and Unhulled Bermudagrass Seeds

Author:
Robert M. Ahring; Glenn W. Todd
Source:
Agronomy journal 1978 v.70 no.4 pp. 667-670
ISSN:
0002-1962
Subject:
Cynodon dactylon; environmental factors; germination; hybrids; potassium nitrate; seed set; seed size; seed yield; seeds; temperature; viability
Abstract:
... Germination procedures used for testing bermudagrass [Cyndon dactylon (L.) Pers.] seed were developed primarily from studies with “common”. Seed of strains other than common, produced under different environmental conditions, may have different germination requirements. Nine strains and five hybrids of bermudagrass, were examined for: 1) differences in seed size, 2) germination capacity in eight d ...
DOI:
10.2134/agronj1978.00021962007000040033x

13. Sex pheromone specificity in Heliothis

Author:
Tingle, F.C.; Mitchell, E.R.; Baumhover, A.H.
Source:
Journal of chemical ecology 1978 v.4 no.4 pp. 471-479
ISSN:
0098-0331
Subject:
Heliothis subflexa; Heliothis virescens; Helicoverpa zea; sex pheromones; sex attractants; trapping; pheromone traps; backcrossing; hybrids; mating behavior; olfactometry; wind tunnels; nocturnal activity
Abstract:
... Electric grid traps baited with Heliothis subflexa (Guenée), H. virescens (F.), or H. zea (Boddie) females captured conspecific males with few exceptions.Heliothis subflexa females reduced the attraction ofH. virescens and H. zea males when used as bait simultaneously with females of either of these two species. Backcrosses were made with H. virescens males and female hybrids from a cross between ...
Handle:
10113/23301
DOI:
10.1007/BF00989503

14. Studies of Ethephon as a Possible Selective Male Gametocide on Tef

Author:
Tareke Berhe; Dwane G. Miller
Source:
Crop science 1978 v.18 no.1 pp. 35-38
ISSN:
0011-183X
Subject:
Eragrostis tef; chemical treatment; embryo sac; ethephon; female fertility; florets; gametogenesis; histology; hybrids; males; phosphorous acid; phytotoxicity; pollen; pollination; seed set
Abstract:
... The gametocidal effect of ethephon (2-chloroethyl phosphonic acid) was studied in two varieties of tef [Eragrostts tef (Zucc.) Trotter] ‘DZ-01-99’ and ‘DZ-01-186’. Foliar applications of 600, 900, and 1,200 ppm were applied three times during heading. The primary objective was to investigate if ethe~phon could be used as a substitute for hand emasculation in tef, therefore alleviating the floral s ...
DOI:
10.2135/cropsci1978.0011183X001800010010x

15. Effects of Three Cycles of Reciprocal Recurrent Selection on the N and Plant Population Responses of Two Maize Hybrids in Kenya

Author:
A. Y. Allan; L. L. Darrah
Source:
Crop science 1978 v.18 no.1 pp. 112-114
ISSN:
0011-183X
Subject:
Zea mays; corn; hybrids; males; nitrogen fertilizers; population density; recurrent selection; Kenya
Abstract:
... H611(R), a variety cross of two maize (Zea mays L.) populations improved by reciprocal recurrent selection, and H613(R), a topcross hybrid with the same male parent, were evaluated to determine if responses to N or population density had changed through three cycles of selection for yield. The evaluation was done with 40, 140, and 240 kg/ha N and 33,300, 44,400, and 55,500 plants/ha at three sites ...
DOI:
10.2135/cropsci1978.0011183X001800010029x

16. Influence of chromosome variation on the organisation of the leaf epidermis in a hybrid Aloë (Liliaceae)

Author:
BRANDHAM, P.E.; CUTLER, D.F.
Source:
Botanical journal of the Linnean Society 1978 v.77 no.1 pp. 1-16
ISSN:
0024-4074
Subject:
Liliaceae; aneuploidy; chromosome aberrations; chromosomes; genes; hybrids; leaves
Abstract:
... Thirteen of a group of 91 hybrids between Aloë rauhii and A. dawei contained either numerical or structural chromosome aberrations. Three aneuploids were found, also one dicentric, one reversed duplication and nine deletions of which two occurred in a single individual. Some of these mutations were shown to have a direct effect on the expression of leaf epidermal characteristics as seen in surface ...
DOI:
10.1111/j.1095-8339.1978.tb01368.x

17. Inheritance of foliar and nodal anatomical characters in some Ilex hybrids

Author:
BAAS, P.
Source:
Botanical journal of the Linnean Society 1978 v.77 no.1 pp. 41-52
ISSN:
0024-4074
Subject:
Ilex aquifolium; evolution; hybrids; inheritance (genetics); lignification; parents; petioles; progeny
Abstract:
... The diverse relationships of the main differential leaf and nodal anatomical characters of a number ot artificial Ilex hybrids and their parents are compared. The marginal sclerenchyma strands character is not transferred to hybrids when differential. The lignification of the unspecialized abaxial epidermal cells is dominantly inherited, except in one hybrid. The development of a distinctive adaxi ...
DOI:
10.1111/j.1095-8339.1978.tb01371.x

18. Lower Stalk Development and Staging of Corn

Author:
D. R. Hicks; R. H. Peterson
Source:
Agronomy journal 1978 v.70 no.3 pp. 485-488
ISSN:
0002-1962
Subject:
Hapludolls; Zea mays; adventitious roots; clay loam soils; corn; early development; field experimentation; grain yield; hail; heat; hybrids; insurance; internodes; leaf area; leaf development; leaves; plant density; planting date; sandy loam soils; silt loam soils; soil temperature; Corn Belt region; Minnesota
Abstract:
... Hail insurance adjustors determine corn (Zea mays L.) leaf stages after leaf number one has deteriorated and prior to tassel emergence by examining the longitudinal section of the lower stalk. They assume the sheath of leaf five is attached to the node immediately above the first elongated internode and determine leaf stage by" counting the leaves above leaf five. Since the leaf area destroyed vs. ...
DOI:
10.2134/agronj1978.00021962007000030030x

19. Phenological adaptations in diapause termination by cecropia from different latitudes

Author:
STERNBURG, J.G.; WALDBAUER, G.P.
Source:
Entomologia experimentalis et applicata 1978 v. no. pp. 48-54
ISSN:
0013-8703
Subject:
Hyalophora cecropia; adults; cold; diapause; eclosion; environmental factors; geographical distribution; heat; hybrids; latitude; phenology; summer; weather; Illinois
Abstract:
... Populations of Hyalophora cecropia (L.) that originated at five different latitudes in Illinois all emerged bimodally as adults. These geographical strains differed in the emergence dates of both their early and late emerging groups although they were all exposed to the same environmental conditions outdoors at Urbana. The emergence dates became progressively earlier with strains originating eithe ...
DOI:
10.1111/j.1570-7458.1978.tb02730.x

20. Relationship of the Kernel Sink for N to Maize Productivity

Author:
C. Y. Tsai; D. M. Huber; H. L. Warren
Source:
Crop science 1978 v.18 no.3 pp. 399-404
ISSN:
0011-183X
Subject:
Zea mays; carbon 14; corn; endosperm; glutelins; grain yield; hybrids; nitrapyrin; nitrogen fertilizers; nutritive value; protein content; starch; sucrose; zein
Abstract:
... This study was designed to evaluate the relationship of zein content with yield potential of maize (Zea mays L.). Maize cultlvars were grown under different rates of N (0 to 201 kg/ha) with and without nitrapyrin (0.55 kg/ha) added to correlate protein content, kernel weight, and grain yield. Carbon-14 dioxide was applied to maize hybrid, Pioneer 3369A, to determine the effect of N on sucrose tran ...
DOI:
10.2135/cropsci1978.0011183X001800030011x