EVALUATION OF INFLUENCE OF LATE-SEASON MOISTURE STRESS ON YIELD AND MORPHO-PHYSIOLOGICAL CHARACTERISTICS OF WHEAT GENOTYPES

Drought stress is one of the most important abiotic factors that limiting crop yield around the world. As climate change leads to increasingly hotter and drier summers, the importance of drought constraints on yield and yield components has increased in Asia and Iran. Bread wheat (Triticum aestivum L.) is one of the most important crops in the center and the west of Iran, where high temperatures and water stress often reduce plant growth and crop yield (Rashid et al, 2003). Some morphological traits such as spike number per m2, grain number per spike, 1000-grain weight, peduncle length, spike weight and grain weight per spike affect wheat tolerance to the moisture shortage in the soil. Kianersi et al (2013) has reported that the days to 50 percent heading, number of spike per m2, 1000-grain weight and grain yield of durum wheat is reduced in terminal moisture stress conditions. The plant height was reduced up to 25% in water stressed citrus seedlings (Wu et al., 2008). The objectives of current study were: (i) detection of the most important effective traits on grain yield under terminal moisture stress, (ii) evaluate the genetic diversity for drought adaptation among the studied genotypes under drought stress in terms of yield, components of yield and phenology attributes

کلیدواژه ها:

Bread wheat ، Yield ، Moisture stress ، Stepwise regression