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首页> 外文期刊>African Journal of Biotechnology >Responses of soybeans (Glycine max (L.) Merrill) associated with variable plant density stress applied at different phenological stages Plasticity or elasticity?
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Responses of soybeans (Glycine max (L.) Merrill) associated with variable plant density stress applied at different phenological stages Plasticity or elasticity?

机译：大豆（Glycine max（L.）Merrill）在不同物候期施加不同的植物密度胁迫的反应。

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摘要

The study evaluated developmental responses associated with plant population density stress applied at different phenological phases and effects on grain yield in determinate and indeterminate soybean (Glycine max L.). A split-split plot design with four replications, with variety (main plot), plant density (sub plot) and thinning time (sub-subplot) was adopted. Two determinate genotypes (Lukanga and SC Semeki) and an indeterminate type (Mwembeshi) were used. Plant density stress was imposed by planting at supra optimal densities (700, 600 and 500 K plants ha-1) (K representing 1000) and stress was removed by thinning to the recommended density (400 K plants ha-1) at different phenological stages. Plant density had little effect on grain yield. Thinning time influenced root to shoot ratio, number of grains per pod, yield and harvest Index (HI). Lukanga had the highest grain yield (2.43 tons ha-1), followed by Mwembeshi (1.95 tons ha-1) and lastly SC Semeki (1.17 tons ha-1). Lukanga exhibited reproductive plasticity, while SC Semeki showed vegetative plasticity. Mwembeshi an indeterminate type suggested non-plastic or ‘elastic’ response. The lack of effect on planting density exemplified by constant yield at different plant densities suggests that maintaining low seed rates is more economical given the high cost of seed.
机译：该研究评估了在不同物候期施加的植物种群密度胁迫相关的发育反应，以及对确定和不确定大豆（Glycine max L.）的籽粒产量的影响。采用具有四个重复的分裂-分裂样地设计，其具有品种（主图），植物密度（子图）和间苗时间（子图）。使用了两个确定的基因型（Lukanga和SC Semeki）和一个不确定的类型（Mwembeshi）。通过以最佳最佳密度（700、600和500 K植物ha-1）（K代表1000）种植来施加植物密度胁迫，并通过在不同物候阶段稀化至建议密度（400 K植物ha-1）来消除胁迫。 。种植密度对谷物产量影响不大。间苗时间影响根冠比，每荚果粒数，产量和收获指数（HI）。 Lukanga的谷物单产最高（2.43吨ha-1），其次是Mwembeshi（1.95吨ha-1），最后是SC Semeki（1.17吨ha-1）。 Lukanga表现出生殖可塑性，而SC Semeki表现出营养可塑性。不确定的Mwembeshi类型表示非可塑性或“弹性”响应。在种植密度不同的情况下，对种植密度的影响不明显，这表明在种子成本高的情况下，保持低种子率更为经济。

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