Unexplored dimensions of variability in vegetative desiccation tolerance
Unexplored dimensions of variability in vegetative desiccation tolerance
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DOI：
10.1002/ajb2.1588
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发表时间：
2021-01-09
影响因子：
3
通讯作者：
VanBuren, Robert
中科院分区：
文献类型：
--
作者：
Marks, Rose A.;Farrant, Jill M.;VanBuren, Robert
干燥耐受性在不同的陆地植物谱系中反复进化，作为在季节性降雨驱动营养组织周期性干燥的地区生存的适应。对这一现象日益增长的兴趣，推动了最近的生理，生化和基因组的见解脱水耐受性的机制基础。虽然，脱水耐受性通常被视为二元和整体，但在不同谱系、异质群体和个体植物的整个发育过程中，表型和潜在机制存在实质性变化。大多数研究都集中在实验室条件下耐干旱植物的保守反应。因此，耐干燥表型的变异性和自然多样性在很大程度上仍然是未知的。在这里，我们讨论了干燥耐受性的自然变化，并认为利用这种多样性可以提高我们对干燥耐受性的机械理解。本文总结了近600种耐干旱陆地植物的资料，并讨论了其脱水反应的分类分布和生理机制。我们指出，需要量化的自然多样性的干燥耐受性的三个尺度上：不同的血统，种内变异种群之间的变化，并在组织和生命阶段的个别植物的变化。我们的结论是，这种变异性应占在实验设计中，可以利用更深入的了解复杂的干燥耐受性。
Desiccation tolerance has evolved recurrently across diverse land plant lineages as an adaptation for survival in regions where seasonal rainfall drives periodic drying of vegetative tissues. Growing interest in this phenomenon has fueled recent physiological, biochemical, and genomic insights into the mechanistic basis of desiccation tolerance. Although, desiccation tolerance is often viewed as binary and monolithic, substantial variation exists in the phenotype and underlying mechanisms across diverse lineages, heterogeneous populations, and throughout the development of individual plants. Most studies have focused on conserved responses in a subset desiccation-tolerant plants under laboratory conditions. Consequently, the variability and natural diversity of desiccation-tolerant phenotypes remains largely uncharacterized. Here, we discuss the natural variation in desiccation tolerance and argue that leveraging this diversity can improve our mechanistic understanding of desiccation tolerance. We summarize information collected from similar to 600 desiccation-tolerant land plants and discuss the taxonomic distribution and physiology of desiccation responses. We point out the need to quantify natural diversity of desiccation tolerance on three scales: variation across divergent lineages, intraspecific variation across populations, and variation across tissues and life stages of an individual plant. We conclude that this variability should be accounted for in experimental designs and can be leveraged for deeper insights into the intricacies of desiccation tolerance.