Open Access

ARTICLE

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

by Ataei R¹, M Gholamhoseini¹, M Kamalizadeh²

1 Assistant professor, Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.
2 Assistant Professor, Jahrom University, Fars, Iran.

Address correspondence to: Majid Gholamhoseini, Seed and Plant Improvement Institute, Alborz Province, Karaj, Iran, e-mail:

Phyton-International Journal of Experimental Botany 2017, 86(all), 228-235. https://doi.org/10.32604/phyton.2017.86.228

Abstract

Understanding the genetic control of traits associated with yield helps breeders to utilize their germplasm in a more efficient and consistent manner and to make good choices in breeding programs. The current study was carried out to study the genetic control of some quantitative traits in bread wheat (Triticum aestivum L.) and to examine plant responses under full irrigation and drought stress conditions. For this purpose, six generations derived from a cross between two lines (Bezostaya as tolerant parent and 518 as a susceptible 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-block design with four replicates. Generation mean analysis indicated that non-allelic interactions were important factors in controlling the expression of these characters. The results indicated that GY under drought conditions, PL under full irrigation and drought stress conditions, and PH, SL and HI under full irrigation conditions were determined for additive gene effects. The PL and TGW were influenced by additive and over dominance gene effects under both irrigation conditions, respectively, and no plant response changes occurred. In general, selection in early segregating generations may be useful for those traits that are affected by additive gene effects.

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