Acclimation of mesophyll conductance and anatomy to light during leaf aging in Arabidopsis thaliana
Acclimation of mesophyll conductance and anatomy to light during leaf aging in Arabidopsis thaliana
复制标题
拟南芥叶片老化过程中叶肉导度和解剖结构对光的适应
DOI：
10.1111/ppl.13398
复制
发表时间：
2021-03-30
影响因子：
6.4
通讯作者：
Flexas, Jaume
中科院分区：
文献类型：
--
作者：
Carriqui, Marc;Nadal, Miquel;Flexas, Jaume
叶肉导度（g（m））是光合作用的一个关键限制因素，其受叶片解剖结构的强烈驱动，而叶片解剖结构又受环境生长条件和个体发育的影响。然而，研究联合环境x年龄对叶片解剖和光合作用的影响是稀缺的，没有进行短寿命植物。本文研究了模式植物拟南芥（Arabidopsis thaliana，Col-0）在三种不同光照强度和两种不同叶龄下的光合作用和叶片解剖结构的变化。我们发现，光x年龄的相互作用是显着的光合作用，但不是解剖特征。增加生长光强导致单位面积叶质量、厚度、栅栏细胞层数和细胞间隙叶绿体面积的增加。弱光和中光对各光合特性均有显著影响。叶片老化与细胞壁厚度（T-CW）在所有的光处理和在低和中等光照强度下生长的植物叶片厚度的增加。然而，g（m）并没有随着叶龄的变化，光合作用只降低叶龄在中等和高的光，这表明增加T-cw和减少叶绿体厚度对总CO2扩散阻力之间的补偿效应。
Mesophyll conductance (g(m)), a key limitation to photosynthesis, is strongly driven by leaf anatomy, which is in turn influenced by environmental growth conditions and ontogeny. However, studies examining the combined environment x age effect on both leaf anatomy and photosynthesis are scarce, and none have been carried out in short-lived plants. Here, we studied the variation of photosynthesis and leaf anatomy in the model species Arabidopsis thaliana (Col-0) grown under three different light intensities at two different leaf ages. We found that light x age interaction was significant for photosynthesis but not for anatomical characteristics. Increasing growth light intensities resulted in increases in leaf mass per area, thickness, number of palisade cell layers, and chloroplast area lining to intercellular airspace. Low and moderate-but not high-light intensity had a significant effect on all photosynthetic characteristics. Leaf aging was associated with increases in cell wall thickness (T-cw) in all light treatments and in increases in leaf thickness in plants grown under low and moderate light intensities. However, g(m) did not vary with leaf aging, and photosynthesis only decreased with leaf age under moderate and high light, suggesting a compensatory effect between increased T-cw and decreased chloroplast thickness on the total CO2 diffusion resistance.