Sydney Institute of Agriculture, School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, Sydney, NSW, Australia.
School of Plant Biology, The University of Western Australia, Crawley, WA, Australia.
PLoS One. 2019 Jun 6;14(6):e0217099. doi: 10.1371/journal.pone.0217099. eCollection 2019.
Drought substantially limits seed yield of common bean (Phaseolus vulgaris L.) in the tropics. Understanding the interaction of drought on yield and the nutrient concentration of the seed is vital in order to supply nutrition to the millions of consumers who rely on common bean as a staple crop. Nevertheless, the impact of drought on common bean for both yield and nutrient concentration has not yet been concurrently investigated in a field environment. Using 10 bred lines developed by CIAT and its partners for their improved adaptation to drought and phosphorus deficiency, this study characterised the impact of drought on yield and nutrient concentration for leaf and seed tissue of common bean grown in the field. Drought significantly reduced leaf area (by ~50%), harvest index (by ~60%), yield (by ~70%), seed weight (by ~25%) and enriched carbon isotope abundance (δ13C) in the seed. Within the soluble leaf fraction, drought significantly decreased the concentration of mineral nutrients and amino acids, whereas no negative effect on the concentration of nutrients and amino acids was detected within the seed. Genotypic variation in nutrient concentration in both the leaf and seed tissue was identified and should be explored further to identify traits that may confer tolerance to abiotic stress.
干旱极大地限制了热带地区普通豆（Phaseolus vulgaris L.）的种子产量。为了为数百万以普通豆为主要作物的消费者提供营养，了解干旱对产量和种子养分浓度的相互作用至关重要。然而，在田间环境中，干旱对普通豆的产量和养分浓度的影响尚未同时进行研究。本研究使用由 CIAT 及其合作伙伴开发的 10 个培育系，以提高其对干旱和缺磷的适应能力，研究了在田间生长的普通豆的叶片和种子组织中干旱对产量和养分浓度的影响。干旱显著降低了叶面积（约 50%）、收获指数（约 60%）、产量（约 70%）、种子重量（约 25%）和种子中碳同位素丰度（δ13C）。在可溶叶部分中，干旱显著降低了矿质养分和氨基酸的浓度，而在种子中没有发现养分和氨基酸浓度的负面影响。鉴定了叶片和种子组织中养分浓度的基因型变异，应进一步探索以鉴定可能赋予对非生物胁迫耐受性的性状。
