THE GENETICS OF YIELD IN SPRING WHEAT (TRITICUM AESTIVUM L.)

1971 ◽  
Vol 13 (1) ◽  
pp. 110-114 ◽  
Author(s):  
P. D. Walton
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Genetic Variance ◽  
Developmental Stages ◽  
Flag Leaf ◽  
Additive Genetic Variance ◽  
Diallel Cross ◽  
Triticum Aestivum L ◽  
Morphological Characters ◽  
Wheat Cultivars

A diallel cross among eight spring wheat cultivars examined the inheritance of yield, its components, certain developmental stages and morphological characters above the flag leaf node. Additive genetic variance was important for all the characters studied. For yield, kernels per ear, ear volume and for the developmental stages considered dominance was also present. Results presented here agreed with the main conclusions drawn in four other diallels crosses which were reported previously.

INHERITANCE OF SEED COAT COLOR IN EIGHT SPRING WHEAT CULTIVARS

1981 ◽  
Vol 61 (3) ◽  
pp. 719-721 ◽  
Author(s):  
R. J. BAKER
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Seed Coat ◽  
Coat Color ◽  
Single Gene ◽  
Triticum Aestivum L ◽  
Seed Coat Color ◽  
Wheat Cultivars

Segregation for seed coat color was studied in F2 populations of crosses between eight red-seeded and three white-seeded cultivars of spring wheat (Triticum aestivum L. em Thell). Red Bobs and Pitic 62 each possessed a single gene for red seed coat color; Glenlea and NB320 each carried two genes; Neepawa, Park and RL4137 each possessed three genes. Data for crosses with Manitou were not sufficient to distinguish between the presence of two or three genes for seed coat color in this cultivar.

COMBINING ABILITY FOR YIELD OF SYNTHETIC HEXAPLOID WHEATS

1974 ◽  
Vol 54 (2) ◽  
pp. 235-239 ◽  
Author(s):  
R. J. BAKER ◽  
P. L. DYCK
Keyword(s):  
Triticum Aestivum ◽  
Seed Yield ◽  
Combining Ability ◽  
Genetic Variance ◽  
Additive Genetic Variance ◽  
Triticum Aestivum L ◽  
Kernel Weight ◽  
Specific Combining Ability ◽  
Synthetic Hexaploid Wheats ◽  
Synthetic Hexaploid

Four hexaploid spring wheats (Triticum aestivum L.), which differ only in their D genomes, were crossed in all combinations. Heterosis was expressed in F1 and F2 for number of spikes, kernel weight, and seed yield. Failure to detect significant specific combining ability among F1 progeny suggests that only additive genetic variance is involved in the inheritance of these traits. Competition between single-spaced plants was detected.

EFFECT OF SEEDING RATE ON GRAIN YIELD, STRAW YIELD AND HARVEST INDEX OF EIGHT SPRING WHEAT CULTIVARS

1982 ◽  
Vol 62 (2) ◽  
pp. 285-291 ◽  
Author(s):  
R. J. BAKER
Keyword(s):  
Triticum Aestivum ◽  
Grain Yield ◽  
Spring Wheat ◽  
Linear Response ◽  
Harvest Index ◽  
Triticum Aestivum L ◽  
Wheat Cultivars ◽  
Seeding Rate ◽  
Straw Yield ◽  
Rate Interaction

Eight cultivars of spring wheat, Triticum aestivum L., were evaluated at seeding rates of 110, 270 and 430 seeds/m2 in a total of nine experiments spanning three locations, two dates of seeding and 2 yr. Grain yield exhibited a significant cultivar × experiment × linear response to seeding rate interaction. Grain yield of Pitic 62 showed a significant decrease with increased seeding rate in one experiment while giving the greatest increase in another. Over all experiments, the highest seeding rate gave the highest grain yield. For straw yield, Chester showed the greatest response to seed rate, Canuck the least. With the exception of Canuck, which showed a significant increase in harvest index with increased seeding rate, harvest index tended to be greater at the intermediate seeding rate.

YIELD OF PURE AND MIXED STANDS OF TWO SPRING WHEAT CULTIVARS SOWN AT FIVE RATES OF SEEDING

1977 ◽  
Vol 57 (3) ◽  
pp. 1005-1007 ◽  
Author(s):  
R. J. BAKER
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Yield Components ◽  
Triticum Aestivum L ◽  
Pure Stand ◽  
Wheat Cultivars ◽  
Seeding Rate ◽  
Mixed Stands ◽  
Yield And Yield Components

Yield and yield components were measured on two spring wheat (Triticum aestivum L. em Thell) cultivars, Neepawa and Pitic 62, and a 1:1 mixture of the two sown at five rates of seeding in each of 2 yr. Lack of agreement between performance in pure and mixed stands was observed when, at the highest seeding rate, the mixture yielded higher in 1974 and lower in 1976 than either of the component cultivars grown in pure stand.

Chromosomes in 'Cadet' and 'Rescue' wheats carrying loci for cold hardiness and vernalization response

1986 ◽  
Vol 28 (6) ◽  
pp. 991-997 ◽  
Author(s):  
D. W. A. Roberts
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Cold Hardiness ◽  
Rank Order ◽  
Triticum Aestivum L ◽  
Wheat Cultivars ◽  
Chromosome Substitution ◽  
Vernalization Response ◽  
Substitution Lines ◽  
Chromosome Substitution Lines

'Rescue', 'Cadet', and the 42 reciprocal chromosome substitution lines derived from these two spring wheat cultivars were tested for vernalization response and cold hardiness. Cold hardiness was tested after hardening under a 16-h day for 8 weeks with 6 °C day and 4 °C night temperatures or in the dark for 7 weeks at 0.8 °C followed by 8 weeks at −5 °C. Chromosomes 5A, 5B, 7B, and possibly 2A carried loci for vernalization response. Chromosomes 2A, 5A, and 5B carried loci affecting cold hardiness measured after 8 weeks in the light at 6 °C during the day and 4 °C at night, whereas chromosomes 6A, 3B, 5B, and 5D were involved in cold hardiness after hardening in the dark at 0.8 °C followed by −5 °C. The results suggest that the rank order of cultivars for cold hardiness depends on the hardening technique used since the two different techniques tested had different genetic and presumably somewhat different biochemical bases.Key words: Triticum aestivum L., cold hardiness, vernalization.

EFFECT OF HERBICIDES ON SEEDLING GROWTH, HEAD DEFORMATION AND GRAIN YIELD OF SPRING WHEAT CULTIVARS

1984 ◽  
Vol 64 (1) ◽  
pp. 25-30 ◽  
Author(s):  
J. A. IVANY ◽  
H. G. NASS
Keyword(s):  
Adverse Effect ◽  
Triticum Aestivum ◽  
Grain Yield ◽  
Spring Wheat ◽  
Field Experiments ◽  
Triticum Aestivum L ◽  
The Other ◽  
Wheat Cultivars ◽  
Plant Weight ◽  
Herbicide Treatment

In field experiments at Charlottetown, P.E.I., five herbicides evaluated at two rates of application on eight spring wheat (Triticum aestivum L.) cultivars showed no effect on dry plant weight 20 days after treatment. Herbicide treatment with dicamba resulted in a greater number of deformed heads per plot compared with the untreated in 1980 and with all herbicides except diclofop-methyl in 1981. More deformed heads occurred with dicamba and the 2,4-D/mecoprop/dicamba mixture at the higher rate of application in 1981 than with the other herbicides and the lower rate of application. All cultivars had more deformed heads than the untreated control when treated with 2,4-D, dicamba and the 2,4-D/mecoprop/dicamba mixture in 1981. Neepawa and Dundas had more deformed heads than the other cultivars when treated with MCPA. Head deformation by herbicide treatment had no adverse effect on grain yield in this study.Key words: Spring wheat cultivars, herbicides, head deformation, 2,4-D, MCPA, dicamba, diclofop-methyl

scholarly journals Comparison of water relations and drought related flag leaf traits in hexaploid spring wheat (Triticum aestivum L.)

2011 ◽  
Vol 52 (No. 5) ◽  
pp. 234-238 ◽  
Author(s):  
W.M. Bhutta ◽  
M. Ibrahim ◽  
Tahira
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Genetic Improvement ◽  
Flag Leaf ◽  
Leaf Traits ◽  
Triticum Aestivum L ◽  
Genetic Advance ◽  
Wheat Varieties ◽  
Leaf Venation ◽  
Stress Environments

Six wheat varieties/lines and six derived F<sub>2</sub>hybrids were studied to ascertain and compare heritability and genetic advance for flag leaf osmotic pressure, flag leaf water potential, flag leaf venation, flag leaf area and flag leaf thickness. Most of these characters had high heritabilities and expected a genetic advance. Prospects of a genetic improvement for all the characters studied are evident. The most promising cross combinations are PASBAN-90 &times; SARC-5 and SH-2002 &times; SARC-5. These traits therefore deserve a better attention in future breeding projects for evolving better wheat for stress environments.

scholarly journals DETERMINATION OF CHARACTERS FOR YIELD SELECTION IN SPRING WHEAT

1973 ◽  
Vol 53 (4) ◽  
pp. 755-762 ◽  
Author(s):  
H. G. NASS
Keyword(s):  
Spring Wheat ◽  
Harvest Index ◽  
Flag Leaf ◽  
Effective Means ◽  
Triticum Aestivum L ◽  
Morphological Characters ◽  
Kernel Weight ◽  
Plot Yield ◽  
Flag Leaf Width

A 2-yr study of 22 cultivars of spring wheat (Triticum aestivum L.) showed that yield per ear and number of ears per plant reduced yield variance the most in stepwise regression analysis. These two components of yield were negatively correlated. Harvest index, kernels per ear, and yield per ear were associated with plot yield. Kernels per ear and kernel weight were associated with yield per ear. Morphological characters influenced plot yield indirectly in that ear area, flag leaf width, and total photosynthetic area above the flag leaf node were associated with yield per ear. Ears per plant, yield per ear, and harvest index considered together in a selection program should be an effective means of selecting for increased yield.

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