School of Life and Environmental Sciences, Faculty of Science, Sydney Institute of Agriculture, The University of Sydney, Sydney, NSW, Australia.
Physiol Plant. 2019 Nov;167(3):391-403. doi: 10.1111/ppl.12899. Epub 2019 Feb 8.
The impact of drought on plant growth and yield has been widely studied and is considered a major limitation to crops reaching yield potential. Less known is the impact of water deficit on the nutritional quality of the resulting yield. This study characterised the impact of water deficit on carbon assimilation, modelled water use efficiency from carbon isotope discrimination and analysed the concentration of mineral nutrients, amino acids and sugars in leaf, phloem and pod pools collected from Phaseolus vulgaris L. (common bean) grown in a controlled environment. Water deficit led to an isohydric response, impacting on carbon isotope abundance in all tissues though not translating to any significant treatment differences in water use efficiency or nutrient content in tissues over the course of plant development. The results obtained in this study demonstrate that nutrient content of P. vulgaris yield was not impacted by the availability of water. The absence of significant changes in the nutrient content of individual seeds highlights the plasticity of developing reproductive tissue to changes in whole plant water availability.
干旱对植物生长和产量的影响已得到广泛研究，被认为是作物达到产量潜力的主要限制因素。但人们对水分亏缺对作物产量营养品质的影响知之甚少。本研究描述了水分亏缺对碳同化的影响，通过碳同位素分馏模拟了水分利用效率，并分析了从小叶、韧皮部和荚果中收集的来自普通菜豆（Phaseolus vulgaris L.）的叶片、韧皮部和荚果中矿物质养分、氨基酸和糖的浓度，这些样本是在受控环境中生长的。水分亏缺导致等水反应，影响所有组织中的碳同位素丰度，但在整个植物发育过程中，这并没有转化为组织中水分利用效率或养分含量的任何显著处理差异。本研究的结果表明，水分供应对普通菜豆产量的养分含量没有影响。个别种子中养分含量没有显著变化，这突出表明生殖组织在整个植物水分供应变化时具有可塑性。
