Effect of Drought Stress on Fructan Metabolism and Translocation in Different Organs of Wheat after Anthesis
In order to reveal the influences of drought stress on fructan metabolism and translocation in different organs of wheat in the duration of post-anthesis,two winter wheat cultivars with different drought tolerance were used to investigate the dynamic rule of fructan metabolism,along with its relationship with grain filling in glume of main spike and different internodes of main stems after flowering under drought stress (DS) and well watered (WW) conditions.Results showed that fructan metabolism and translocation of different organs of wheat in filling stage were significantly affected by the genotype,water condition,organ,day after anthesis,and interactions between these factors.Especially,such factors as organ and day after anthesis,and interactions of day after anthesis with water condition were more critical to modulate the fructan metabolism and translocation.The fructan content of different organs were all rise first and then fall during the grain filling.Compared to the WW,DS could shorten the peak appearance of fructan content by five days.To fructan content,DS promoted its accumulation first,and then boosted its degradation.This effects were more remarkable in the drought cultivar Longjian 19,and in glumes,peduncle and penultimate internodes.DS observably inhibited the activity of sucrose:sucrose 1-fructosyltransferase (1-SST),but significantly enhanced the activity of fructan exohydrolase (FEH) during the grain filling.The fructan content showed higher positive correlation with the FEH activity.Furthermore,significantly negative correlations were observed between the grain weight with the 1-SST activity in different organs and the FEH activity in the penultimate internode and third internode,whereas the positive correlations were indicted between the grain-filling rate in different organs,the fructan content and the FEH activity in glume and peduncle internode.DS could markedly improve the translocation and reallocation of fructan.In this case,fructan translocation rate and contribution rate to grain ranged from 6.86％ to 70.52％,and from 0.07％ to 4.93％,respectively,of which before anthesis were significantly higher than those after anthesis,in Longjian 19 than in Q 9086,and in peduncle and penultimate internodes than in glumes and third internodes from the top as well.
Wheat (Triticum aestivum)Drought stressFructan metabolismAccumulation and translocationGrain filling
NETL
NSTL
万方数据
维普
