绿体春化时间和光周期互作对耐抽薹普通白菜现蕾开花的影响

Effects of Seeding-vernalization Time and Photoperiod Interaction on Bolting and Flowering of Late-bolting Pakchoi

以31份耐抽薹普通白菜自交系为试材,进行种芽春化(40 d)和光周期(16、20 h·d^(-1))处理;在此基础之上选择对长日照反应不同的材料,进行绿体春化时间(0、35、55、75 d)和光周期(8、12、16、20 h·d^(-1))处理,探讨绿体春化时间和光周期互作对耐抽薹普通白菜现蕾开花的影响。结果表明:部分耐抽薹普通白菜经种芽春化处理40 d不能满足其对低温的需求量,延长光照时长可以促进现蕾,但长日照促进耐抽薹普通白菜现蕾开花存在基因型差异。绿体春化处理35 d,8 h·d^(-1)和12 h·d^(-1)光照条件下耐抽薹普通白菜均不能现蕾、开花,光周期≥16 h·d^(-1)可以促进现蕾、开花,表明在绿体春化时间不足时,延长光照时长能够部分替代春化时间以促进现蕾开花,显著缩短现蕾时间和开花时间;春化时间与光周期互作对现蕾率和开花率的影响达极显著水平。

Taking 31 late-bolting pakchoi inbred lines as material,this study conducted treatments on plumule-vernalization for 40 days and photoperiod for 16,20 h·d^(-1).On the basis of above results,take different responses to long sunlight were used to seeding-vernalization for 0,35,55,75 days and photoperiod treatments for 8,12,16,20 h·d^(-1) as a control to explore the effects of seeding-vernalization and photoperiodic treatments on bolting time and flowering time of late-bolting pakchoi.The results showed that 40 days of plumule-vernalization treatment was insufficient to meet the low temperature requirements of late-bolting pakchoi,and extending light duration could promote bolting time.But there existed genotype differences promoted by long sunlight for bolting time and flowering time of late-bolting pakchoi.Thirty-five days of seeding-vernalization treatment and under photoperiods of 8 h·d^(-1) and 12 h·d^(-1),were still unable to make the late-bolting pakchoi having their bolting time and flowering time.When the photoperiod≥16h·d^(-1),it could promote bolting time and flowering time,indicating when the seeding-vernalization time was insufficient,extending light duration could partially replace vernalization time,so as to promote bolting time and flowering time and significantly shorten the time of bolting and flowering.The effects of seedingvernalization time interacted with photoperiod on rates of bolting and flowering had reached a very significant level.