Effect of low temperature on physiological characteristics of wheat seeds at different stages of germination
[Objective]To clarify the impacts of low-temperature stress on the physiological characteristics of wheat seeds at dif-ferent stages of the germination process and to compare the low-temperature tolerance of two wheat varieties during the germi-nation stage.[Methods]Taking'Hangmai 247'and'Ji Mai 22'as the test materials,the stages of suckering,sprouting,and germi-nation were divided by standard germination experiments,and then all three stages were subjected to low-temperature stress at 4 ℃ for 6 h,12 h,and 24 h,respectively,to determine the germination indexes,morphological indexes,and physiological inde-xes.[Results]The three stages of seed germination of'Ji Mai 22'and'Hangmai 247'were 0-6 h,6-21 h,21 h,and 0-6 h,6-18 h,18 h,respectively;germination potential,germination rate,germination index and vigor index of wheat seeds at different stages of germination decreased during low temperature stress;soluble sugar content,relative electrolyte exudation rate,and malondial-dehyde content increased in the suckering stage;seedling length,main root length,and fresh weight decreased in the suckering stage.The germination rate,germination potential,germination index,and vigor index of wheat seed germination in all stages of low-temperature stress decreased;seedling length,main root length,and fresh weight decreased;soluble sugar content,relative electrolyte extravasation rate,and malondialdehyde content increased;low-temperature stress in the suckering stage had the greatest effect on wheat seed germination;and the ability of'Hangmai 247'to tolerate low-temperature stress in the germination stage was higher than that of'Ji Mai 22'.[Conclusion]Low temperature stress affected the physiological characteristics of wheat seeds at different stages of germination,with the greatest effect at the suckering stage.
wheatlow temperature stressgerminationphysiological property
NETL
NSTL
万方数据
