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Differential mean performance of 9-parental cotton diallel cross progenies in full and short season environments: 1. planting seed quality [electronic resource].

By:

Abo El-Zahab, A. A

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Language: English Summary language: Arabic Description: p.87-773Other title:

اختلاف متوسط الأداء النسبى لهجين دائرى من القطن ذو تسعة آباء فى بيئتى-موسم النمو الكامل، موسم النمو القصير: 1.صفات جودة بذور التقاوى [Added title page title]

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Egyptian journal of plant breeding, 2008 v. 12 (1) [electronic resource].

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Full Text Article.

In: Egyptian Journal of Plant Breeding 2008.v.12(1)Summary: This investigation was conducted with the objective of obtaining guidelines for efficient parental choice of cotton cultivars in cross breeding program for developing superior vari eties for conventional (full season environment, FSE) and late planting (short season environment, SSE) systems. Three Pima (P₁= Earlipima, P₂= Pima S-6 and P₃=Pima S-7) and six long staple (P₄= Dandara, P₅= Giza 80, p₆= Giza 90, P₇= Giza 85, P₈= Giza 89, and P₉= Giza 83) Egyptian cotton genotypes were crossed in all possible combinations excluding reciprocals in 2003. Inbreeding for the resultant 36 F₁'s to produce F₂'s was done in 2004. In 2005, field evaluation of 81 entries (9 parents, 36 F₁'s and 36 F₂'s) was made at two planting dates, 17 March, designated as FSE and 1 May for late planting cropping system designated as SSE. With more emphasis on the F₂ data, the collected statistical and genetical estimates revealed that: 1) variation due to environment was insignificant, 2) G x E interaction was also insignificant, 3) the variabililty for the three major traits of seed certification traits (PLS and its two main components viz. G.c. and AP) was mostly due to additive gene effects in both FSE and SSE environments except for G.G. in SSE, and 4) F₂HPH was significant for several crosses in FSE and SSE especially P₂ x P₄ , P₂ x P₈ , and P₆ x P₈ for PLS and three crosses P₁ x P₆, P₂ X P₈ and P₆ x P₈ in G.c. in both environments. Therefore, the array of evidences based on the aforementioned estimates indicate that there ;s possibility for improving the major seed quality traits viz. PLS, G.c., and AP in one breeding program for the two environments (FSE and SSE) with special emphasis on the aforementioned crosses. For improving both physical cotton seed traits(S.D., S.Imm., S.W:, and S.V.) and seed certification quality (AP, G.c., and PLS) the crosses P₂ x P₈, P₆ x P, and P₇ X P₈ in FSE environment and P₂ x P₄, P₂ X P₆, and P₈ x P₉ in SSE may be have top priority for improving seed quality traits.

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This investigation was conducted with the objective of obtaining guidelines for efficient parental choice of cotton cultivars in cross breeding program for developing superior vari eties for conventional (full season environment, FSE) and late planting (short season environment, SSE) systems. Three Pima (P₁= Earlipima, P₂= Pima S-6 and P₃=Pima S-7) and six long staple (P₄= Dandara, P₅= Giza 80, p₆= Giza 90, P₇= Giza 85, P₈= Giza 89, and P₉= Giza 83) Egyptian cotton genotypes were crossed in all possible combinations excluding reciprocals in 2003. Inbreeding for the resultant 36 F₁'s to produce F₂'s was done in 2004. In 2005, field evaluation of 81 entries (9 parents, 36 F₁'s and 36 F₂'s) was made at two planting dates, 17 March, designated as FSE and 1 May for late planting cropping system designated as SSE. With more emphasis on the F₂ data, the collected statistical and genetical estimates revealed that: 1) variation due to environment was insignificant, 2) G x E interaction was also insignificant, 3) the variabililty for the three major traits of seed certification traits (PLS and its two main components viz. G.c. and AP) was mostly due to additive gene effects in both FSE and SSE environments except for G.G. in SSE, and 4) F₂HPH was significant for several crosses in FSE and SSE especially P₂ x P₄ , P₂ x P₈ , and P₆ x P₈ for PLS and three crosses P₁ x P₆, P₂ X P₈ and P₆ x P₈ in G.c. in both environments. Therefore, the array of evidences based on the aforementioned estimates indicate that there ;s possibility for improving the major seed quality traits viz. PLS, G.c., and AP in one breeding program for the two environments (FSE and SSE) with special emphasis on the aforementioned crosses. For improving both physical cotton seed traits(S.D., S.Imm., S.W:, and S.V.) and seed certification quality (AP, G.c., and PLS) the crosses P₂ x P₈, P₆ x P, and P₇ X P₈ in FSE environment and P₂ x P₄, P₂ X P₆, and P₈ x P₉ in SSE may be have top priority for improving seed quality traits.

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