Influences of Low Temperature at Booting Stage on Spikes and Grains of Winter Wheat

Li Yugang; Gong Mingbo; Wang Ruiying; Li Zhenqing; Chi Hongmei; Zhang Jiyu; Ge Hongmei

doi:10.14083/j.issn.1001-4942.2016.07.012

Abstract：Under the condition of late spring low temperature in Qingdao in April 2013,the influences on spikes and grains of winter wheat were investigated.The results showed that the tested wheat spikes got frozen in different degrees,each wheat spike had several abnormal spikelets,and of which the anther was also abnor-mal in flowering period.The analysis on setting percentage of abnormal spikelets showed that the average grain number was 2.26,which were 1 ~2 grains less than that in ordinary year,and the emptygrain percentage was 4.0%.Further analysis revealed that compared with normal grains,the grains of abnormal spikelets were wiz-ened.There was no significant difference in grain length between normal and abnormal grains,while the grain width was significantly lower and the thousand grain weight was extremely significantly reduced than those of normal grains.The number of abnormal spikelets per spike (NASS)and the frequency of abnormal spikes (FAS)in 30 sample spikes were analyzed under no irrigation and irrigation once before low temperature.The results showed that under no irrigation condition,the average values of NASS and FAS were 4.86 and 92% re-spectively,while those under irrigation once condition were 3.96 and 78% respectively.It indicated that irri-gating before late spring low temperature at booting stage could reduce the injury degree on spikes of winter wheat.This study also listed the real time monitoring temperature and soil water regime in 5 days during the <br> happening period of low temperature at booting stage,which could provide references for the setting of manual simulation environment in the further study of booting stage low temperature.