外源乙烯利与茉莉酸施用时期对甜菜生长及产量品质的调控效应OA

[Objective]Effects of application timing of ethephon(ETH)and/or jasmonic acid(JA)in regulating the growth,yield,and quality of sugar beets were studied.[Method]A field experiment was conducted in Shihezi,Xinjian in 2025 on sugar beet KWS7748.Five treatments were established:(CK)water control,(T1)application of ETH at 900 t·hm-2 during rapid leaf growth stage and root bulking stage(the early-to-mid stage),(T2)application of ETH at 900 t·hm-2 during the root bulking stage and sugar accumulation periods(the mid-to-late stage),(T3)combined application of ETH at 900 t·hm-2 and JA at 225 t·hm-2 during the early-to-mid stage and combined application of ETH at 900 t·hm-2 and JA at 225 t·hm-2 during mid-to-late stage(T4).Agronomic traits,leaf area index,photosynthetic pigments,antioxidant enzyme activities,and beet yield and quality indicators were monitored throughout the plant growth periods.[Result]T1 significantly increased the beet yield over CK to 148.05 t·hm-2.However,the sugar content in the beets was the lowest among the plants under the various treatments.In contrast,T2 also significantly elevated the yield but maintained a constant sugar content.Between T3 and T4,T3 produced plants with greater leaf area index(LAI),total chlorophyll content at late stage,and antioxidant activity,resulting in higher beet yield of 143.16 t·hm-2 with the highest sugar content of 11.51%and crop yield of 16.46 t·hm-2.The principal component analysis indicated that T3 simultaneously optimized the cultivation on source-sink relationship,stress resistance,yield as well as beet quality.[Conclusion]The foliar application of 900 g·hm-2 ethephon with 225 g·hm-2 jasmonic acid at the rapid leaf growth and root bulking stages was effective in increasing the yield and sugar content in the beets.