Changes in radiation interception and R:FR over time and with canopy depth of two soybean cultivars with different branching characteristics
Changes in radiation interception and R:FR over time and with canopy depth of two soybean cultivars with different branching characteristics
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两个具有不同分枝特性的大豆品种的辐射截获和R:FR随时间和冠层深度的变化
DOI：
10.1080/1343943x.2017.1294464
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发表时间：
2017
影响因子：
2.5
通讯作者：
Laaorthip Maitree & Kanchana Chomsang
中科院分区：
文献类型：
--
作者：
Masanori Toyota;Laaorthip Maitree & Kanchana Chomsang
由于植物辅助芽的生长受光敏色素检测的光质调控，大豆不同环境或品种的分枝差异可能是对光环境响应的结果。因此，我们分析了两个确定的大豆品种“初阪”和“Sachiyutaka”在低密度和高密度下与冠层内光质量相关的分枝数差异。我们比较了地表红光与远红光辐照比（R:FR）随时间和冠层高度的变化，以及截获光合有效辐射（FIPAR）分数和叶面积指数（LAI）的变化。R:FR与FIPAR、LAI在不同时间和距离下均呈s型变化，且与FIPAR、LAI呈对称变化。密度和品种对FIPAR、LAI和R:FR的影响可以用logistic函数建模。低密度时枝数大于高密度时枝数，初坂区枝数大于坂丰区枝数。但不同种植密度和品种间R:FR动态差异不显著。R:FR变化动态参数与FIPAR和LAI变化动态参数之间的密切关系表明，无论时间还是冠层深度，FIPAR和LAI都是调节R:FR的主要因子。我们没有发现冠层内R:FR动态随时间或冠层深度和枝条数之间的因果关系。
Because an outgrowth of auxiliary bud in plant is regulated by light quality detected by phytochrome, branching differences in various environment or cultivars in soybean would be the results of the responses to light environment. Therefore, we analyzed differences in the number of branches of two determinate soybean cultivars, ‘Hatsusayaka’ and ‘Sachiyutaka’, between low and high planting densities in relation to light quality within the canopy. We compared changes in the ratio of red to far red (R:FR) irradiance at the ground level over time and with canopy height with those in the fraction of intercepted photosynthetically active radiation (FIPAR) and leaf area index (LAI). Regardless of time or distance from the top of the canopy, the changes in R:FR were sigmoidal, and were symmetrical with those of FIPAR and LAI. The effects of density and cultivar on FIPAR, LAI, and R:FR could be modeled with a logistic function. The number of branches was greater at low density than at high density, and in Hatsusayaka than in Sachiyutaka. However, there were no notable differences in the dynamics of R:FR between planting densities or between cultivars. Close relationships between parameters of the dynamics of the changes in R:FR and of those in FIPAR and LAI suggest that FIPAR and LAI are major factors that regulate R:FR, regardless of time or canopy depth. We found no evidence of a causal relationship between the dynamics of R:FR within the canopy over time or with canopy depth and number of branches of either cultivar.
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期刊：
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