Contrasting adaptive strategies to terminal drought-stress gradients in Mediterranean legumes: phenology, productivity, and water relations in wild and domesticated Lupinus luteus L.
Contrasting adaptive strategies to terminal drought-stress gradients in Mediterranean legumes: phenology, productivity, and water relations in wild and domesticated Lupinus luteus L.
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DOI：
10.1093/jxb/eru006
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发表时间：
2014-11
影响因子：
6.9
通讯作者：
Ludwig C
中科院分区：
文献类型：
--
作者：
Berger JD;Ludwig C
降雨梯度选择对比，综合，适应性战略，在地中海豆科植物，羽扇豆luteus，物候，生产力，繁殖力和水的利用相匹配的季节性降雨。挥霍的高降雨量的生态类型已经发展出耐旱性，这在避免干旱的低降雨量的生态类型中是多余的。我们的理解种内一年生植物适应降雨梯度是支离破碎的。Grime的C-S-R三角的大规模生态应用往往是肤浅的，而详细的干旱生理学往往是狭窄的，集中在精英品种。前者缺乏解释植物如何反应的细节，而后者几乎没有提供背景来调查性状之间的权衡，以解释这些性状在哪里/为什么是适应性的。生态生理学，前者的广度与后者的细节相结合，可以解决这种脱节，并在这里应用于描述地中海豆科植物Lupinus luteus的适应性策略。野生和驯化的材料从低和高降雨量的环境进行了评估对比终端干旱。这些对立的环境选择了对比、整合和适应性的策略。长季节，高降雨量的栖息地选择竞争（C）的特点：延迟物候，高地上和地下生物量，生产力和繁殖力，导致高用水量和早期应力发作。终端干旱倾向的环境选择相反：杂草（R）性状，促进干旱逃避/避免，但限制生殖潜力。令人惊讶的是，高降雨量的生态类型产生较低的临界叶水势下水分亏缺，保持较高的相对含水量比后者。鉴于L.在桑迪，低持水能力的土壤中，这是一个赌注对冲响应间歇性自我施加的水分亏缺与强烈的C选择的适应策略，因此是多余的R选择的低降雨量的生态型。驯化湖黄体甚至更多的是R选择，反映了对早熟的持续选择。从野生种质中导入合适的C选择适应性性状可以拓宽作物生产范围。
Rainfall gradients select for contrasting, integrated, adaptive strategies in the Mediterranean legume, Lupinus luteus, where phenology, productivity, fecundity, and water-use are matched to seasonal rainfall. Profligate high-rainfall ecotypes have developed drought tolerance that is redundant in drought-avoiding low-rainfall ecotypes. Our understanding of within-species annual plant adaptation to rainfall gradients is fragmented. Broad-scale ecological applications of Grime’s C-S-R triangle are often superficial, while detailed drought physiology tends to be narrow, focusing on elite cultivars. The former lack the detail to explain how plants respond, while the latter provide little context to investigate trade-offs among traits, to explain where/why these might be adaptive. Ecophysiology, combining the breadth of the former with the detail of the latter, can resolve this disconnect and is applied here to describe adaptive strategies in the Mediterranean legume Lupinus luteus. Wild and domesticated material from low- and high-rainfall environments was evaluated under contrasting terminal drought. These opposing environments have selected for contrasting, integrated, adaptive strategies. Long-season, high-rainfall habitats select for competitive (C) traits: delayed phenology, high above- and below-ground biomass, productivity, and fecundity, leading to high water-use and early stress onset. Terminal drought-prone environments select for the opposite: ruderal (R) traits that facilitate drought escape/avoidance but limit reproductive potential. Surprisingly, high-rainfall ecotypes generate lower critical leaf water potentials under water deficit, maintaining higher relative water content than the latter. Given that L. luteus evolved in sandy, low-water-holding capacity soils, this represents a bet-hedging response to intermittent self-imposed water-deficits associated with a strongly C-selected adaptive strategy that is therefore redundant in R-selected low-rainfall ecotypes. Domesticated L. luteus is even more R-selected, reflecting ongoing selection for early maturity. Introgression of appropriate C-selected adaptive traits from wild germplasm may widen the crop production range.
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影响因子：
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