Soil alkalinity imposes important limitations to lupin productivity; however, little attention has been paid to investigate the effects of soil alkalinity on plant growth and development. Many lupins are sensitive to alkaline soils, butLupinus albusmaterial from Egypt was found to have tolerance to limed soils. The aim of this study was to compare the growth response of two cultivars ofL.albusL. – an Egyptian cultivar, P27734, and an Australian cultivar, Kiev Mutant, to different soil pH levels and to understand the physiological mechanisms underlying agronomic alkalinity tolerance of P27734. Plants were grown under three pH levels (5.1, 6.7, and 7.8) in a temperature-controlled glasshouse. For both cultivars, the greatest dry mass production and carboxylate exudation from roots were observed at alkaline pH. The better performance of the Egyptian cultivar at high pH was entirely accounted for by its greater seed weight. From a physiological perspective, the Australian cultivar was as alkaline-tolerant as the Egyptian cultivar. These findings highlight the agronomic importance of seed weight for sowing, and both cultivars can be used in alkaline soils.

中文翻译：

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两羽羽扇的表现。品种对三种土壤 pH 值的响应

土壤碱度对羽扇豆的生产力施加了重要限制；然而，很少有人关注土壤碱度对植物生长发育的影响。许多羽扇豆对碱性土壤很敏感，但羽扇豆来自埃及的材料被发现对石灰土壤具有耐受性。本研究的目的是比较两个品种的生长反应。白乳杆菌L. – 一个埃及品种 P27734 和一个澳大利亚品种 Kiev Mutant，对不同的土壤 pH 值水平，了解 P27734 农艺耐碱度的生理机制。在温度受控的温室中，植物在三种 pH 值（5.1、6.7 和 7.8）下生长。对于这两个品种，在碱性 pH 值下观察到最大的干物质产量和根部的羧酸盐渗出。埃及品种在高 pH 条件下的更好性能完全归功于其更大的种子重量。从生理学角度来看，澳大利亚品种与埃及品种一样耐碱。这些发现突出了种子重量对播种的农艺重要性，并且这两个品种都可以在碱性土壤中使用。