Effects of elevated CO2 on leaf area dynamics in nodulating and non-nodulating soybean stands
Effects of elevated CO2 on leaf area dynamics in nodulating and non-nodulating soybean stands
复制标题
二氧化碳浓度升高对结瘤和非结瘤大豆林叶面积动态的影响
DOI：
10.1007/s11104-013-1826-6
复制
发表时间：
2013
期刊：
影响因子：
4.9
通讯作者：
Hikosaka K
中科院分区：
文献类型：
--
作者：
Oikawa S;Okada M;Hikosaka K
目的CO2浓度升高对叶面积指数（LAI）的影响因研究而异。我们假设，CO2和氮的相互作用对叶面积损失有重要的作用在LAI regulation.MethodsWe研究了叶面积生产和损失，使用大豆和其非大豆等基因系在CO2控制的温室systems.ResultsLeaf面积生产增加CO2水平升高的大豆立场，并在较小程度上在非大豆线。CO2浓度升高加速叶面积的损失，只有在种植植物。因此，这两种植物表现出类似的刺激峰值LAI与CO2海拔。加速叶片损失的植物可能是由于新产生的叶子遮蔽了下部的叶子。在整个生长阶段，结瘤植物获得N，而非结瘤植物没有获得N开花后，由于土壤N的耗尽。结论大豆叶面积指数的调控与冠层内光能利用率、新器官对氮素的吸收和需求有关。这些影响因生长阶段和CO2水平而异。
AimsThe effects of elevated CO2on leaf area index (LAI) vary among studies. We hypothesized that the interactive effects of CO2and nitrogen on leaf area loss have important roles in LAI regulation.MethodsWe studied the leaf area production and loss using nodulating soybean and its non-nodulating isogenic line in CO2-controlled greenhouse systems.ResultsLeaf area production increased with elevated CO2levels in the nodulating soybean stand and to a lesser extent in the non-nodulating line. Elevated CO2levels accelerated leaf area loss only in nodulating plants. Consequently, both plants exhibited a similar stimulation of peak LAI with CO2elevation. The accelerated leaf loss in nodulating plants may have been caused by newly produced leaves shading the lower leaves. The nodulating plants acquired N throughout the growth phase, whereas non-nodulating plants did not acquire N after flowering due to the depletion of soil N. N retranslocation to new organs and subsequent leaf loss were faster in non-nodulating plants compared with nodulating plants, irrespective of the CO2levels.ConclusionLAI regulation in soybean involved various factors, such as light availability within the canopy, N acquisition and N demands in new organs. These effects varied among the growth stages and CO2levels.