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| Effects of Seeding-vernalization Time and Photoperiod Interaction on Bolting and Flowering of Late-bolting Pakchoi |
| TAN Shuting，SHENG Lu，SONG Shixia，YANG Lanting，LIU Dan，AI Xin* |
| College of Horticulture，Hunan Agricultural University，Engineering Research Center for Horticultural Crop Germplasm Creation and New Variety Breeding，Ministry of Education，Key Laboratory for Vegetable Biology of Hunan Province，Changsha 410128，Hunan，China |
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Abstract 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．
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Received: 19 September 2023
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