西北林学院学报2024，Vol.39Issue(4)：46-53,8.DOI:10.3969/j.issn.1001-7461.2024.04.06
铝胁迫下千年桐叶片角度及形态特征的变化
Changes of Leaf Angle and Morphological Characteristics of Aleurites montana Under Aluminum Stress
摘要
Abstract
By adjusting the leaf angle,higher plants can improve the light utilization efficiency under low light conditions or effectively avoid the damage of intense light under high-level light radiation,so as to promote plant growth by obtaining moderate light or reducing light stress.Environmental stress,however,will exert various effects on foliar photopic behaviors.In order to explore the influence of aluminum stress on leaf morphology and behavior of Aleurites montana,a common eco-species in red soil region,one-year-old A.montana seedlings were subjected to four different concentrations of aluminum treatments:0(con-trol,CK),0.555(low Al treatment,T1),0.746(moderate Al treatment,T2)and 1.111 mmol·L-1(high Al treatment T3).Differences in leaf angle,leaf morphological characteristics and photosynthetic physio-logical indexes of A.montana seedlings under different concentrations of aluminum stress were compared to analyze the related factors affecting leaf angle changes and reveal the response of A.montana to alumi-num stress from the perspectives of leaf morphological plasticity and photopic adjustment.The results showed that under the condition of sufficient light,the leaf midrib angle of the control treatment was the smallest(106.00°)at 7:30,and the leaf vein was in a near horizontal position.With the increase of light,the leaf midrib angle increased.The daily variation amplitude of leaf midrib angle and leaf lamina angle un-der different aluminum concentration treatments was in the order of T2＜T3＜CK＜T1.The leaf length,leaf width,petiole length and leaf area of A.montana decreased significantly under T1 and T3 treatments,and the leaf shape index reached the maximum value under T3 treatment.The net photosynthetic rate and transpiration rate of A.montana leaves were the smallest under T2 treatment,decreased by 32.35％and 46.22％,respectively,compared to the control.Instant water use efficiency reached the maximum under T2 treatment.Correlation analysis showed that there was a significant negative correlation between leaf lamina angle and petiole length and leaf shape index.There was a significant negative correlation between leaf mid-rib angle and leaf lamina angle.It can be seen that in the absence of aluminum stress,A.montana can re-duce the interception of light radiation by reducing the leaf lamina angle and increasing the leaf midrib an-gle under strong light conditions to avoid light damage.Under weak light conditions,both sides of the blade can receive more light radiation by increasing the leaf lamina angle and reducing the midrib angle.Under low aluminum concentration,A.montana can still carry out active leaf light adjustment.Under medium and high aluminum concentrations,the amplitude of leaf angle of A.montana decreases,but the water loss of leaves can be reduced by adjusting photosynthetic physiological indexes,and the regulation of petiole on leaf angle can be realized.关键词
千年桐/铝胁迫/叶角度变化/叶片形态/光合指标Key words
Aleurites montana/aluminum stress/leaf angle change/leaf morphology/photosynthetic index分类
农业科技引用本文复制引用
肖巧云,张瑶锐,林晗,陈灿,范海兰,谢安强,颜欢欢..铝胁迫下千年桐叶片角度及形态特征的变化[J].西北林学院学报,2024,39(4):46-53,8.基金项目
福建省科技厅计划项目(KTP21116A) （KTP21116A）
福建省林业厅种业创新项目(KLb21009B) （KLb21009B）
福建省水土保持试验站项目(KH190193A,KH220045A) （KH190193A,KH220045A）
福建农林大学林学高峰学科建设项目(72202200205) （72202200205）
福州市自然科学基金项目(榕科[2021]266号). （榕科[2021]266号）
