Preponderant of Dominant Gene Action in Maize Revealed by Generation Mean Analysis under Natural and Drought Stress Conditions

Mode of gene action, heritability and determination of the effective breeding strategy for improvement of physiological and traits specifically in drought stress conditions is very important. Therefore, this study was conducted by using two drought susceptible and tolerant wheat cultivars. Cultivars Sakha8 (tolerant) and Pishtaz (susceptible) as parents along with F1, F2, BC1 and BC2 generations were sown in a randomized complete block design with three replications in drought stress conditions. Results of analysis of variance indicated significant difference between generations as well as degree of dominance revealed over-dominance for the both traits. Fitting simple additive-dominance model designated that this model was not able to account for changes of traits relative water content and mean of grain filling rate. It was revealed that m-d-h-i-j model for relative water content and m-d-h-i model for mean of grain filling rate are the best models. Estimation of heritability and mode of gene action indicated that selection for improvement of traits studied in stress condition and specifically in early generations have medium genetic gain. In conclusion, grain filling rate is better than relative water content as indirect selection criteria to improve plant grain yield in drought stress condition.

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Gene action of yield related characters under normal and drought stress conditions in Brassica napus L.

Pakistan Journal of Botany ◽

10.30848/pjb2021-6(26) ◽

2021 ◽

Vol 53 (6) ◽

Author(s):

Wajiha Ijaz ◽

Shamsa Kanwal ◽

M. Hammad Nadeem Tahir ◽

Humera Razzaq

Keyword(s):

Drought Stress ◽

Brassica Napus ◽

Gene Action ◽

Stress Conditions ◽

Brassica Napus L

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Generation Mean Analysis for Yield and Its Component Traits in Diallel Population of Cotton (Gossypium hirsutum L.)

Indian Journal of Agricultural Research ◽

10.18805/ijare.a-5639 ◽

2020 ◽

Author(s):

Jaya Parkash Yadav ◽

R. K. Giri ◽

S. K. Verma

Keyword(s):

Gossypium Hirsutum ◽

Gene Action ◽

Dominant Gene ◽

Genetic Advance ◽

Cotton Yield ◽

Generation Mean Analysis ◽

Seed Cotton ◽

Narrow Sense Heritability ◽

Gene Effects ◽

Seed Cotton Yield

Background: The nature and magnitude of gene action decides the choice of breeding procedure for achieving desired genetic improvement in any crop. It is particularly important to have an idea of gene interactions for getting genetic advance for polygenic traits such as yield and fiber traits in cotton. Method: The current study was undertaken to investigate the gene action controlling yield and components traits in eight Gossypium hirsutum varieties by using means of the six generations (P1, P2, F1, F2, BC1 and BC2) of 8 x 8 diallel crossing program. The mean of the crosses for the traits in each generation were used for generation mean analysis. Conclusion: Results revealed that the estimated mean effects (m) were highly significant for all traits, indicating quantitative inheritance of these traits. Out of the seven traits under study five traits showed significance for at least one scaling test. Additive and dominant gene effects were significant for seed cotton yield and number of monopods with larger magnitude of dominance effects than additive ones. Dominance, additive x dominance and dominance x dominance were significant for boll weight, number of monopods, seed cotton yield and seed index. Narrow-sense heritability and genetic advance were found low for most of the traits.

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Generation mean analysis in wheat (Triticum aestivum L.) under drought stress conditions

Annals of Agricultural Sciences ◽

10.1016/j.aoas.2014.11.003 ◽

2014 ◽

Vol 59 (2) ◽

pp. 177-184 ◽

Cited By ~ 5

Author(s):

Alaa Ali Said

Keyword(s):

Triticum Aestivum ◽

Drought Stress ◽

Triticum Aestivum L ◽

Stress Conditions ◽

Generation Mean Analysis

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Gene action of achene yield traits in sunflower under drought stress condition

The Pakistan Journal of Agricultural Sciences ◽

10.21162/pakjas/21.1474 ◽

2021 ◽

Vol 58 (04) ◽

pp. 1255-1261

Author(s):

Ejaz-ul Hasan

Keyword(s):

Drought Stress ◽

Short Stature ◽

Stress Condition ◽

Gene Action ◽

Inbred Lines ◽

Stress Conditions ◽

Early Flowering ◽

Early Maturity ◽

Drought Tolerant ◽

Drought Stress Condition

Drought is one of the most damaging environmental stresses, which decreases the achene yield of sunflower (Helianthus annuus L.). The objectives of our experimentations were to determine the type of gene action in sunflower under drought stress, for the identification of the lines with higher achene yield for purpose of developing hybrid with higher achene yield. Thirty-two single cross hybrids from 12 inbred lines were developed through line × tester mating design through crossing 8 drought tolerant inbred lines with 4 drought susceptible lines. The evaluation experiment was performed under an alpha (0,1) lattice incomplete block design with three replications. The achene yield related traits like DF, DM, PH, NL/P, HD, SG, AY/P and TAW were evaluated under normal irrigation and drought stress conditions. Values of degree of dominance greater than one indicating that traits were under the control of dominant genetic effect. Based on GCA effects, L1 proved good combiner for early flowering, maturity and short stature; while L6 was a good combiner for NL/P, HD and AY/P while L8 for HD, SG, AY/P and TAW under drought stress condition. Based on SCA effects, Hybrid 20 was found a good SCA combiner for early flowering, early maturity, short stature, higher HD, AY/P and TAW under normal as well as drought stress conditions. It was suggested form our study that the lines L1, L6 and L8 can be further used to develop drought tolerant hybrids for higher yield and L5 × L12 (Hy 20) was proposed for general cultivation in irrigated as well as rainfed areas of Pakistan.

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Inheritance of Resistance to Aflatoxin Production in the Cross Between Corn Inbreds B73 and LB31

Phytopathology ◽

10.1094/phyto.1997.87.11.1144 ◽

1997 ◽

Vol 87 (11) ◽

pp. 1144-1147 ◽

Cited By ~ 24

Author(s):

K. W. Campbell ◽

A. M. Hamblin ◽

D. G. White

Keyword(s):

Gene Action ◽

Dominant Gene ◽

Aflatoxin Production ◽

Inheritance Of Resistance ◽

Generation Mean Analysis ◽

Additive Variance ◽

Resistant Parent ◽

Frequency Distributions ◽

Selection For ◽

The Cross

The inheritance of resistance to aflatoxin production in corn (Zea mays) caused by the fungus Aspergillus flavus was studied following inoculation in progeny derived from the cross between the susceptible inbred B73 and the resistant inbred LB31. In 1993, the susceptible parent B73 (P1), resistant parent LB31 (P2), F1, F3, and BCP1-selfed generations were evaluated. In 1994, the study was expanded to include the F2, BCP1, and BCP2 generations. Aflatoxin concentrations were higher in 1993 than 1994. Generation mean analysis showed that additive and dominant gene action were important for resistance to aflatoxin production. Potence ratios indicated dominance for resistance in both years. In 1993, aflatoxin values of the F1 generation were significantly lower than the calculated mid-parent values, indicating dominant gene action favoring resistance. In 1994, values of the F1 generation were not significantly lower than the calculated midparent value. The frequency distributions of aflatoxin values for families of the F3 and BCP1-selfed generations were skewed toward the resistant parent, also indicating dominance. Heritability based on a progeny mean basis of F3 families representing the additive variance plus one-fourth of the dominance variance was estimated at 66% over both years combined. Based on these results, selection for resistance to aflatoxin production in progeny derived from the cross between B73 and LB31 should be effective.

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