生态学报2024，Vol.44Issue(5)：2100-2114,15.DOI:10.20103/j.stxb.202302280364
不同干旱处理刺槐、侧柏光合特性与内源脱落酸含量的相关关系
Relationship between photosynthetic characteristics and endogenous abscisic acid content of Robinia pseudoacacia and Platyclus orientalis under different drought treatments
摘要
Abstract
This paper aims to reveal the endogenous abscisic acid(ABA)regulatory mechanism of drought mediated plant photosynthetic capacity,the typical tree species of Robinia pseudoacacia and Platycladus orientalis in Beijing were used to explore the relationship between carbon assimilation and organ ABA allocation modet of young trees under rapid drought-rehydration(T1)and slow drought-rehydration(T2).The results showed that:(1)the net photosynthetic rates(Pn),stomatal conductances(Gs),and transpiration rates(Tr)of R.pseudoacacia and P.orientalis decreased significantly with the decrease of soil volume water content(SWC)during the T1 and T2 drought treatment stages(P＜0.05).The decrease amplitudes of Pnof two tree species in T1(99.18%and 57.30%)were greater than those in T2(91.97%and 36.69%).The decrease in Pnand Gsof R.pseudoacacia T1 and T2 were greater than those of P.orientalis.At the stage of post-drought rehydration in T1 and T2,the recovery degrees of Pnand Gsof two tree species in T1 were higher than that in T2.The photosynthetic capacities of R.pseudoacacia recovered to the level before water stress treatments of T1 and T2,while these of P.orientalis only partially recovered.(2)The ABA content in leaves,twigs,coarse and fine roots of two tree species increased significantly increased with the decrease of SWC(P＜0.05).The increase amplitudes of ABA at the whole plant level of two tree species T2(21.21%and 26.01%)were higher than those of T1(13.71%and 8.91%).The coarse roots of T1 and T2 tree species showed significantly lower ABA levels in the rehydration stage after drought compared to the drought stage,while ABA levels in other organs remained at the drought stage level.(3)By exploring the relationship between photosynthetic characteristics and ABA of Two tree species and discovering the regularity of changes in soil moisture,significantly negative correlations were found between photosynthetic parameters and ABA content of two tree species in T1 and T2(P＜0.05).The slower the decline rate of SWC,the higher the degree of synergistic changes between photosynthetic parameters and organ ABA of the two tree species.And the correlation coefficient between photosynthesis and ABA of R.pseudoacacia is higher than that of P.orientalis.In conclusion,photosynthetic parametersthe,ABA and their relationship in the organs of the two tree species were significantly affected by the soil drought rhythm.This study can reveal the carbon assimilation and endogenous hormone regulation response mechanisms of plants in response to different drought stresses,providing theoretical reference for the selection,cultivation,and management of drought tolerant trees in regional urban landscaping.关键词
干旱节律/旱后复水/光合特性/内源脱落酸Key words
drought rhythms/rehydration/photosynthetic characteristics/endogenous abscisic acid引用本文复制引用
赵娜,吕建魁,李少宁,徐晓天,李斌,赵加辉,鲁绍伟..不同干旱处理刺槐、侧柏光合特性与内源脱落酸含量的相关关系[J].生态学报,2024,44(5):2100-2114,15.基金项目
国家自然科学基金项目(32171537,32071834) （32171537,32071834）
北京市农林科学院创新能力建设项目(KJCX20220412) （KJCX20220412）
