Temperature-dependent shade avoidance involves the receptor-like kinase ERECTA.
Temperature-dependent shade avoidance involves the receptor-like kinase ERECTA.
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DOI：
10.1111/tpj.12088
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
D. Patel;M. Basu;S. Hayes;I. Majláth;Flora M Hetherington;T. Tschaplinski;K. Franklin
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文献类型：
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作者：
D. Patel;M. Basu;S. Hayes;I. Majláth;Flora M Hetherington;T. Tschaplinski;K. Franklin
植物通过监测环境光中红光(R)与远红光（FR）波长（R:FR）之比的变化来探测邻近植被的存在。R:FR的减少被植物光感受器光敏色素家族感知，并启动一系列发育反应，称为避荫综合征。这包括茎和叶柄的伸长增加，使植物能够超过竞争植被。大多数避荫实验是在标准实验室生长温度下进行的（bb0 - 20°C）。在这些条件下，对低R:FR的伸长响应通常伴随着叶片发育和植物生物量积累的减少。在这里，我们研究了在较低温度（16°C）下的避荫反应。在这些条件下，拟南芥表现出明显的低R: fr介导的叶面积增加，低R: fr介导的叶柄伸长和叶片低矮化反应减少。在竖兰（Landsberg erecta）中，这些显著不同的避荫表型伴随着叶片厚度的增加、生物量的增加和代谢物谱的改变。在16°C时，低R:FR处理导致可溶性糖和与冷驯化相关的代谢物的积累。对16°C遮荫躲避反应的自然遗传变异分析揭示了受体样激酶ERECTA的调节作用。
Plants detect the presence of neighbouring vegetation by monitoring changes in the ratio of red (R) to far-red (FR) wavelengths (R:FR) in ambient light. Reductions in R:FR are perceived by the phytochrome family of plant photoreceptors and initiate a suite of developmental responses termed the shade avoidance syndrome. These include increased elongation growth of stems and petioles, enabling plants to overtop competing vegetation. The majority of shade avoidance experiments are performed at standard laboratory growing temperatures (>20°C). In these conditions, elongation responses to low R:FR are often accompanied by reductions in leaf development and accumulation of plant biomass. Here we investigated shade avoidance responses at a cooler temperature (16°C). In these conditions, Arabidopsis thaliana displays considerable low R:FR-mediated increases in leaf area, with reduced low R:FR-mediated petiole elongation and leaf hyponasty responses. In Landsberg erecta, these strikingly different shade avoidance phenotypes are accompanied by increased leaf thickness, increased biomass and an altered metabolite profile. At 16°C, low R:FR treatment results in the accumulation of soluble sugars and metabolites associated with cold acclimation. Analyses of natural genetic variation in shade avoidance responses at 16°C have revealed a regulatory role for the receptor-like kinase ERECTA.