Leaf area and photosynthesis of newly emerged trifoliolate leaves are regulated by mature leave in soybean
Leaf area and photosynthesis of newly emerged trifoliolate leaves are regulated by mature leave in soybean
复制标题
大豆新出三叶叶的叶面积和光合作用受成熟叶的调节
DOI：
--
复制
发表时间：
2018
影响因子：
2.8
通讯作者：
Yang Wenyu
中科院分区：
文献类型：
--
作者：
Wu Yushan;Gong Wanzhuo;Wang Yangmei;Yong Taiwen;Yang Feng;Liu Weiguo;Wu Xiaoling;Du Junbo;Liu Jiang;Liu Chunyan;Yang Wenyu
植物发育中叶片的叶解剖和气孔发育已被证明受到与成熟叶片相同的光环境的调节，但尚未有报道表明来自成熟叶片的这种长距离信号是否调节新出现叶片的总叶面积。为了探索这个问题，我们创建了一个调查，我们收集的数据，叶面积，叶质量单位面积（LMA），叶解剖，细胞大小，细胞数量，气体交换和可溶性糖含量的叶片从三个大豆品种生长在充分的阳光（NS），遮荫成熟叶（MS）或整个植物生长在阴凉处（WS）。结果表明，MS或WS处理使新叶的叶面积和叶面积平均值均显著下降。叶片解剖结构也表现出遮荫叶的特征，叶片厚度、栅栏组织厚度、海绵组织厚度、细胞大小和细胞数量均减少。另外，MS和WS处理下，新叶的净光合速率（Pn）、气孔导度（Gs）和蒸腾速率（E）均低于全光照处理，但胞间CO2浓度（Ci）高于全光照处理。MS和WS处理的新叶可溶性糖含量显著降低。这些结果表明：（1）新叶的叶面积、叶片解剖结构和光合功能受成熟叶的系统辐射信号的调控;（2）细胞大小和数量的减少是遮荫下叶片变小变薄的主要原因;（3）糖可能作为系统调控叶面积的候选信号物质。
Leaf anatomy and the stomatal development of developing leaves of plants have been shown to be regulated by the same light environment as that of mature leaves, but no report has yet been written on whether such a long-distance signal from mature leaves regulates the total leaf area of newly emerged leaves. To explore this question, we created an investigation in which we collected data on the leaf area, leaf mass per area (LMA), leaf anatomy, cell size, cell number, gas exchange and soluble sugar content of leaves from three soybean varieties grown under full sunlight (NS), shaded mature leaves (MS) or whole plants grown in shade (WS). Our results show that MS or WS cause a marked decline both in leaf area and LMA in newly developing leaves. Leaf anatomy also showed characteristics of shade leaves with decreased leaf thickness, palisade tissue thickness, sponge tissue thickness, cell size and cell numbers. In addition, in the MS and WS treatments, newly developed leaves exhibited lower net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (E), but higher carbon dioxide (CO2) concentration in the intercellular space (Ci) than plants grown in full sunlight. Moreover, soluble sugar content was signifcantly decreased in newly developed leaves in MS and WS treatments. These results clearly indicate that (1) leaf area, leaf anatomical structure, and photosynthetic function of newly developing leaves are regulated by a systemic irradiance signal from mature leaves; (2) decreased cell size and cell number are the major cause of smaller and thinner leaves in shade; and (3) sugars could possibly act as candidate signal substances to regulate leaf area systemically.