Population variation in the cost and benefit of tolerance and resistance against herbivory in Datura stramonium
Population variation in the cost and benefit of tolerance and resistance against herbivory in Datura stramonium
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DOI：
10.1111/j.0014-3820.2004.tb00455.x
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发表时间：
2004-08-01
期刊：
影响因子：
3.3
通讯作者：
Núñez-Farfán, J
中科院分区：
文献类型：
--
作者：
Fornoni, J;Valverde, PL;Núñez-Farfán, J
在这项研究中，我们研究的假设，不同的自然选择产生遗传分化的群体之间的植物防御策略（耐受性和电阻）产生适应性变化的防御性状对草食动物。控制遗传材料（父系半同胞家庭）从两个人口的一年生曼陀罗遗传分化的耐受性和耐草食动物。这组父系半同胞家庭种植在两个网站的原产地和模式的基因型选择作用于耐受性和抗性的确定，以及存在和变化的耐受性的分配成本的大小。选择分析支持适应性分化假说。平均抗性水平高的地点有利于抗性，平均抗性水平高的地点有利于抗性。存在显着的环境依赖性成本的耐受性是在协议与网站的适应性值的变化。我们的研究结果支持的期望，植物防御策略的环境依赖性成本可以产生种群之间的防御性状的进化轨迹的差异，并促进选择马赛克的存在。耐受性的对比选择模式表明，在某些种群中，D.对曼陀罗的耐受性可能会改变植物抗性与天敌之间互惠协同进化的强度。
In this study we examine the hypothesis that divergent natural selection produces genetic differentiation among populations in plant defensive strategies (tolerance and resistance) generating adaptive variation in defensive traits against herbivory. Controlled genetic material (paternal half-sib families) from two populations of the annual Datura stramonium genetically differentiated in tolerance and resistance to herbivory were used. This set of paternal half-sib families was planted at both sites of origin and the pattern of genotypic selection acting on tolerance and resistance was determined, as well as the presence and variation in the magnitude of allocational costs of tolerance. Selection analyses support the adaptive differentiation hypothesis. Tolerance was favored at the site with higher average level of tolerance, and resistance was favored at the site with higher average level of resistance. The presence of significant environmentally dependent costs of tolerance was in agreement with site variation in the adaptive value of tolerance. Our results support the expectation that environmentally dependent costs of plant defensive strategies can generate differences among populations in the evolutionary trajectory of defensive traits and promote the existence of a selection mosaic. The pattern of contrasting selection on tolerance suggests that, in some populations of D. stramonium, tolerance may alter the strength of reciprocal coevolution between plant resistance and natural enemies.