Evolutionary senescence in plants
Evolutionary senescence in plants
复制标题
植物的进化衰老
作者：
D. Roach
衰老是指随着年龄的增长，特定年龄的生存和繁殖能力下降。对进化植物衰老的研究旨在解释自然选择背景下生命史成分的下降。对植物人口学研究的回顾揭示了一年生和多年生植物的衰老衰退，但也表明有些植物物种可能不会表现出衰老。因此，未来对密切相关的物种（无论是否有衰老）进行比较研究应该是可能的。评估主要衰老进化理论的假设对于植物的有效性。不同的植物物种违反了理论的一项或多项假设，但违反这些假设的后果从未被研究过。尽管迄今为止，仅在植物中间接研究了进化衰老，但得出的结论是，植物为阐明我们对自然群体衰老的理解提供了良好的实验系统。
Senescence is a decline in age-specific survival and reproduction with advancing age. Studies of evolutionary plant senescence are designed to explain this decline in life history components within the context of natural selection. A review of studies of plant demography reveals senescent declines in both annual and perennial plants, but also suggests that there are some plant species which may not be expected to show senescence. Thus, future comparative studies of closely related species, with and without senescence, should be possible. The assumptions of the major evolutionary theories of senescence are evaluated for their validity with respect to plants. Different plant species violate one or more of the assumptions of the theories, yet the consequences of violating these assumptions have never been investigated. Whereas, to date, evolutionary senescence has been studied only indirectly in plants, it is concluded that plants provide good experimental systems for clarifying our understanding of senescence in natural populations.