Effect of Waterlogging on Yield and Yield Components of Wheat (Triticum aestivum L.)

摘要

Waterlogging is an important factor influencing wheat yield. In the study, a field experiment was designed to evaluate the response of three wheat cultivars to waterlogging at three growth stages (stress at the first of tillering, stress at the beginning of stem elongation and stress at the commencement of booting stage) with three levels of waterlogging duration (0, 7, and 14 days). Results indicated that yield, yield components were significantly affected by cultivars, stages of waterlogging and waterlogging durations. Response of stress at the first of tillering was higher than other growth stages except 1000-kernel weight. Increasing waterlogging duration decreased yield, spike number per square meter, 1000-kernel weight and number of kernels per spike. Average yield loss was 71.6 kg/h or 1.5% for each day waterlogging which were mainly caused by a decrease in kernel number per spike and spike number per square meter which were reduced by 1.1% and 0.74% per day of waterlogging, respectively. Toevaluate tolerant mechanisms of wheat cultivars, aerenchyma tissue and proline content were evaluated in a pot experiment under waterlogging duration (0, 7, 14 and 21 days) at seedling stage. Results indicated that aerenchyma formation and proline accumulation were important in determining waterlogging-tolerance in wheat cultivars.