南京林业大学学报（自然科学版）2025，Vol.49Issue(1)：137-144,8.DOI:10.12302/j.issn.1000-2006.202303007
6-BA对太子参生长后期的生理调节作用
Physiological regulation of 6-BA on late growth of Pseudostellaria heterophylla
摘要
Abstract
[Objective]This research aims to investigate the effects of exogenous growth regulator 6-BA on the growth and physiology of Pseudostellaria heterophylla at the late growth stage and to provide a theoretical basis for efficient cultivation of P.heterophylla.[Method]Different concentrations of 6-BA(0,20,40,60 mg/L)were applied to the leaves in mid-May to determine the effects of 6-BA on root tuber growth,the antioxidant enzyme system,and the photosynthetic characteristics of P.heterophylla.[Result](1)Compared to the control(CK),the root length,root diameter,fresh root yield,biomass per plant,dry weight of the aboveground part,and dry weight of the underground part of P.heterophylla in each 6-BA treatment group were significantly increased,with the 60 mg/L treatment showing the most pronounced effect.The fresh root yield and biomass per plant increased by 35.41％and 41.60％,respectively,compared to the CK,and these differences were statistically significant(P＜0.05).(2)The 6-BA treatment with an appropriate mass concentration significantly increased the activities of SOD and POD,as well as the chlorophyll and carotenoid contents in P.heterophylla leaves during the experiment.It also effectively mitigated the rising trend of MDA content and the declining trend of photosynthetic pigments.(3)The Pn,Gs,and Tr of P.heterophylla increased to varying degrees while Ci decreased,effectively alleviating the"nap"phenomenon of photosynthesis caused by non-stomatal restriction.The 60 mg/L treatment had the most significant effect.The daily mean,peak,and trough values of Pn increased by 51.76％,41.24％,and 64.47％,respectively.(4)Compared to the control,the chlorophyll fluorescence parameters Fv/Fm,Fv'/Fm',ΦPSⅡ,and qP in each 6-BA treatment group increased to varying degrees during the experiment,while the NPQ value decreased.(5)The φPo,ψo,φEo,EABS/CSm,ETRo/CSm,EETo/CSm,and cPIabs significantly increased,while φDo and Epo/CSm decreased with 6-BA treatment at an appropriate mass concentration(60 mg/L).These results indicated that the 6-BA treatment enhances the efficiency of PS Ⅱ light energy absorption,allocation,and utilization,as well as leaf-specific activity,alleviating the photoinhibition caused by excess excitation energy.[Conclusion]The 6-BA treatment at an appropriate mass concentration effectively enhances the antioxidant activity and photosynthetic performance of P.heterophylla leaves at the late growth stage,promoting growth and increasing root yield.The improvement in photosynthetic performance is related to enhancing antioxidant activity and PS Ⅱ photochemical activity in the leaves.关键词
太子参/6-BA/抗氧化系统/光合作用/叶绿素荧光Key words
Pseudostellaria heterophylla/6-BA/antioxidant system/photosynthesis/chlorophyll fluorescence分类
农业科技引用本文复制引用
马菊林,邱玲玲,谢寅峰,闾倩,马迎莉,梁文超..6-BA对太子参生长后期的生理调节作用[J].南京林业大学学报（自然科学版）,2025,49(1):137-144,8.基金项目
江苏高校优势学科建设工程资助项目(PAPD). （PAPD）
