Institute of Agricultural Sciences, Federal University of Uberlândia - UFU, Rodovia LMG 746, Km 01, Bairro Araras, Monte Carmelo, MG, Brazil.
Agricultural Sciences, Federal University of São João del-Rei - UFSJ, Sete Lagoas, MG, Brazil.
Sci Rep. 2022 Mar 14;12(1):4379. doi: 10.1038/s41598-022-08337-3.
Changes in root growth and metabolism of P in tomato cultivars are necessary in acidic soils in tropical and subtropical regions in response to P deficiency. This increase in the efficiency of phosphorus absorption by tomatoes can significantly reduce the doses of phosphate fertilizers used, as well as, possibly, the more immediate use of P fixed in the soil matrix, with favorable effects on agricultural sustainability, promoting the use of marginal areas in terms of soil fertility, and the national fertilizer economy. The tested hypothesis was that there would be no difference in the uptake and utilization of P by tomato cultivars; therefore, this study investigated the variation in the dynamics of absorption and efficiency of P-use through changes in the root, stem, leaf, gas exchange, and P-use efficiency in tomato cultivars contrasting P-absorption. The experimental design comprised a factorial scheme consisting of two cultivars that were tolerant and sensitive to P deficiency and three P concentrations (control, moderate deficiency, and severe deficiency). P limitation in the tolerant cultivar promoted high dry matter concentration (root, stem, and leaf), leaf area, root volume, nutrient translocation, rate of leaf gas exchange, and efficiency under P-deficiency stress. It was concluded from the research that the variation in the dynamics of absorption and efficiency of P use of the tolerant cultivar increased the production of roots, leaves, and leaf gas exchange under P stress conditions.
在热带和亚热带地区的酸性土壤中，番茄品种需要改变根系生长和磷代谢，以应对磷缺乏。番茄吸收磷效率的提高可以显著减少磷酸盐肥料的用量，也可能更直接地利用土壤基质中固定的磷，这对农业可持续性有积极影响，促进了对土壤肥力较差地区的利用，并有利于国家的肥料经济。本研究假设番茄品种在磷吸收和利用方面没有差异，因此，研究了通过吸收和利用效率的变化，探讨了番茄品种在吸收磷方面的差异。实验设计包括一个两因素方案，由两个对磷缺乏敏感和耐受的品种以及三个磷浓度（对照、中度缺乏和严重缺乏）组成。在耐受品种中，磷的限制促进了高干物质浓度（根、茎和叶）、叶面积、根体积、养分转移、叶片气体交换速率和磷缺乏胁迫下的效率。研究得出结论，耐受品种吸收和利用效率变化的动态增加了在磷胁迫条件下根系、叶片和叶片气体交换的产量。
