Vegetative dormancy in orchids incurs absolute and relative demographic costs in large but not in small plants
Vegetative dormancy in orchids incurs absolute and relative demographic costs in large but not in small plants
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兰花的营养休眠会导致大型植物的绝对和相对人口成本，但小型植物不会
DOI：
10.1093/botlinnean/boy065
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发表时间：
2018
影响因子：
2.4
通讯作者：
Tuomi Juha
中科院分区：
文献类型：
--
作者：
Hurskainen Sonja;Alahuhta Kirsi;Hens Hilde;Jakalaniemi Anne;Kull Tiiu;Shefferson Richard P;Tuomi Juha
陆生兰花并不总是在每个生长季节发芽，而且很大一部分兰花可能留在地下。这种植物休眠可能导致绝对的人口成本，或者，可替代地，休眠植物的人口效益，以及与生长季节期间出现的植物的表现相比的相对成本或效益。使用长期的数据为三个陆生兰花，我们表明，营养休眠的影响是大小和状态依赖。在大的和成熟的个人，营养休眠似乎产生绝对的成本，并导致更频繁的下降，在大小和状态相比，发芽状态。相反，小植物在营养休眠期间往往会长大，有时甚至会导致幼苗成熟。然而，这种生长和成熟在幼嫩的兰花中同样常见，因此小植物或幼嫩植物的营养休眠似乎不会为未来的表现提供明显的相对效益或成本。
Terrestrial orchids do not always sprout every growing season and a significant proportion of the population may remain underground. Such vegetative dormancy may lead to absolute demographic costs or, alternatively, demographic benefits for dormant plants, as well as relative costs or benefits compared to the performance of plants that did emerge during the growing season. Using long-term data for three terrestrial orchids, we show that the effects of vegetative dormancy are size- and state-dependent. In large and mature individuals, vegetative dormancy appeared to incur absolute costs and to lead to more frequent decline in size and state compared to sprouting states. Instead, small plants tended to grow in size during vegetative dormancy, which sometimes even led to maturation in the young plants. However, this growth and maturation was just as common in young sprouting orchids, such that vegetative dormancy in small or young plants does not appear to offer either a pronounced relative benefit or cost for future performance.