Genetic analysis for quantitative traits in bread wheat exposed to irrigated and drought stress conditions

R Ataei, M Gholamhoseini, M Kamalizadeh


Understanding the genetic control of traits associatedwith yield helps breeders to utilize their germplasm in a more efficientand consistent manner and to make good choices in breedingprograms. The current study was carried out to study the geneticcontrol of some quantitative traits in bread wheat (Triticum aestivumL.) and to examine plant responses under full irrigation and droughtstress conditions. For this purpose, six generations derived from across between two lines (Bezostaya as tolerant parent and 518 as asusceptible parent) were evaluated for grain yield (GY), plant height(PH), peduncle (PL) and spike (SL) lengths, thousand grain weight(TGW) and harvest index (HI) using a randomized complete-blockdesign with four replicates. Generation mean analysis indicated thatnon-allelic interactions were important factors in controlling theexpression of these characters. The results indicated that GY underdrought conditions, PL under full irrigation and drought stress conditions,and PH, SL and HI under full irrigation conditions weredetermined for additive gene effects. The PL and TGW were influencedby additive and over dominance gene effects under both irrigationconditions, respectively, and no plant response changes occurred.In general, selection in early segregating generations may be usefulfor those traits that are affected by additive gene effects.

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Phyton. International Journal of Experimental Botany. ISSN print 0031-9457 ISSN en line 1851-5657 Fundación Rómulo Raggio Gaspar Campos 861,  Vicente López, Buenos Aires, Argentina (C.P. 1638) Tel 54 11 4791-0868 / 4796-1456