| In order to provide the information on high and stable yield of wheat in the middle and lower reaches of the Yangtze River,a greenhouse experiment,using wheat variety Yangfumai 4,was designed to investigate the effects of 5-,10- and 15-day waterlogging at elongation stage and after anthesis on yield,yield components,dry matter and nitrogen accumulation and remobilization in wheat. Waterlogging treatment at both of the two stages significantly decreased the yield,kernels per spike,1 000-kernels weight,dry matter and nitrogen accumulation amount of root and shoot at maturity and post-anthesis shoot,and root-shoot ratio. An increasing trend of waterlogging-induced reduction in yield,yield components,dry matter and nitrogen accumulation and remobilization was observed along with the extended waterlogging duration. No significant differences between 5- and 10-day waterlogging treatments were found in yield,kernels per spike,post-anthesis dry matter and nitrogen accumulation amount in shoot,and root-shoot ratio,while the results between 5- and 15-day waterlogging treatments showed significant difference.There were no significant differences between/among short-term waterlogging treatment at elongation and after anthesis. However,the yield under 15-day waterlogging after anthesis was significantly lower than that at the elongation stage. In general,the effects of waterlogging after anthesis on 1 000-kernels weight,post-anthesis dry matter and nitrogen accumulation in shoot,and pre-anthesis dry matter remobilization in shoot were significantly higher than that at elongation. It was suggested that the effects of waterlogging on yield,yield components,dry matter and nitrogen accumulation and remobilization in wheat relies on the waterlogging stage and its duration. |
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