Branch development responses to planting density and yield stability in soybean cultivars
Branch development responses to planting density and yield stability in soybean cultivars
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DOI：
10.1080/1343943x.2016.1157443
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发表时间：
2016-01-01
影响因子：
2.5
通讯作者：
Shiraiwa, Tatsuhiko
中科院分区：
文献类型：
--
作者：
Agudamu;Yoshihira, Taiki;Shiraiwa, Tatsuhiko
本研究的目的是阐明大豆品种之间的差异，产量反应在不同的种植密度参考分支发展。我们在江别的乐野学园大学调查了有限型北海道和无限型美国品种的主茎和分支种子产量和分枝特性。在2009年和2010年，两个日本和两个美国品种种植在三个密度从9.5到20株m（-2）。在2011年和2012年，每个地区的三个品种，在三个密度从8.3到22.2株m（-2）栽培。美国品种在16.7株m ~（-2）或更低密度下的种子产量显著高于北海道品种，表明其产量对较低密度的敏感性低于北海道品种。品种间产量对种植密度的响应差异与较低种植密度下分支种子产量的较大增加密切相关，这有效地补偿了单位面积主茎数的减少。通过将分支性能与植物间距（每株植物的土地面积）相关联来量化响应于种植密度（分支可塑性）的分支发育的变异性。一些美国品种表现出更大的分支可塑性比日本品种具有相似的生长时间。研究结果表明，大豆品种对不同种植密度的反应不同，通过不同的分支可塑性。
The objective of this study was to elucidate variability among soybean cultivars in yield response at different planting densities in reference to branch development. We investigated the main stem and branch seed yield and the branching characteristics of determinate Hokkaido and indeterminate US cultivars at the Rakuno Gakuen University in Ebetsu. In 2009 and 2010, two Japanese and two US cultivars were grown at three densities from 9.5 to 20 plants m(-2). In 2011 and 2012, three cultivars from each region were cultivated at three densities from 8.3 to 22.2 plants m(-2). The seed yields of the US cultivars at densities of 16.7 plants m(-2) or less were markedly higher than those of the Hokkaido cultivars, showing that their yield is less sensitive to lower planting density than Hokkaido cultivars. The difference in yield in response to planting density among cultivars was closely associated with a larger increase in branch seed yield with lower planting density, which effectively compensated for the decrease in main stem number per unit land area. The variability of branch development in response to planting density (branching plasticity) was quantified by correlating branch performance with plant spacing (land area per plant). Some US cultivars exhibited greater branching plasticity than Japanese cultivars with similar growth duration. Results of this study suggest soybean cultivar differs in responsiveness to varied planting density through different branching plasticity.