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首页> 外文期刊>Annals of Botany >Ontogenetic contingency of tolerance mechanisms in response to apical damage
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Ontogenetic contingency of tolerance mechanisms in response to apical damage

机译：根尖损伤反应中耐受机制的本体遗传偶然性

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Background and Aims Plants are able to tolerate tissue loss through vigorous branching which is often triggered by release from apical dominance and activation of lateral meristems. However, damage-induced branching might not be a mere physiological outcome of released apical dominance, but an adaptive response to environmental signals, such as damage timing and intensity. Here, branching responses to both factors were examined in the annual plant Medicago truncatula.Methods Branching patterns and allocation to reproductive traits were examined in response to variable clipping intensities and timings in M. truncatula plants from two populations that vary in the onset of reproduction. Phenotypic selection analysis was used to evaluate the strength and direction of selection on branching under the damage treatments.Key Results Plants of both populations exhibited an ontogenetic shift in tolerance mechanisms: while early damage induced greater meristem activation, late damage elicited investment in late-determined traits, including mean pod and seed biomass, and supported greater germination rates. Severe damage mostly elicited simultaneous development of multiple-order lateral branches, but this response was limited to early damage. Selection analyses revealed positive directional selection on branching in plants under early-compared with late-or no-damage treatments.Conclusions The results demonstrate that damage-induced meristem activation is an adaptive response that could be modified according to the plant's developmental stage, severity of tissue loss and their interaction, stressing the importance of considering these effects when studying plastic responses to apical damage.
机译：背景和目的植物能够通过剧烈的分支来耐受组织的损失，而分支通常是由顶端优势的释放和横向分生组织的激活触发的。但是，损伤诱导的分支可能不仅仅是释放的根尖优势的生理结果，而是对环境信号（例如损伤时机和强度）的适应性响应。在这里，在一年生植物苜蓿苜蓿（Medicago truncatula）中检查了对这两个因素的分支响应。方法根据来自两个种群在繁殖开始时发生变化的截枝芒（M. truncatula）植物的剪枝强度和时间变化，研究了分支模式和对生殖性状的分配。表型选择分析用于评估在损伤处理下分枝选择的强度和方向。关键结果两种种群的植物均表现出耐受机制的个体发生变化：虽然早期损伤诱导更大的分生组织活化，但晚期损伤引发了后期确定的投资。性状，包括平均荚果和种子生物量，支持更高的发芽率。严重损害主要引起多级侧支的同时发展，但这种反应仅限于早期损害。选择分析显示，在早期与后期或无伤害处理相比，植物的分枝具有积极的方向选择。结论结果表明，损伤诱导的分生组织激活是一种适应性反应，可以根据植物的发育阶段，严重程度进行修改。组织损失及其相互作用，强调在研究对顶端损伤的塑性反应时考虑这些影响的重要性。

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