Reproductive biology of two dominant prairie grasses (Andropogon gerardii and Sorghastrum nutans, Poaceae): male-biased sex allocation in wind-pollinated plants?
Reproductive biology of two dominant prairie grasses (Andropogon gerardii and Sorghastrum nutans, Poaceae): male-biased sex allocation in wind-pollinated plants?
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两种优势草原草（Andropogon gerardii 和 Sorghastrum nutans，禾本科）的生殖生物学：风授粉植物中雄性偏向的性别分配？
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
J. O’Brien
中科院分区：
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作者：
M. McKone;C. Lund;J. O’Brien
有人提出，一些风授粉植物具有实现雄性偏向的最佳性别分配的必要条件，尽管很少有数据证明这一预测。我们确定了两种草原草种（Andropogon gerardii 和 Sorghastrum nutans）的繁殖特征，理论上会导致雄性偏向分配：这两个物种都是自交不亲和的，并且在补充人工授粉后，这两个物种都没有增加结实率。花粉和种子生产的相对分配是根据生物量、能量、氮、磷、钾、镁和钙来衡量的。当以生物量、能量、钾和钙的货币衡量时，A. gerardii 的性别分配明显偏向男性（从 60% 到 89% 是男性）；以氮、磷和镁的货币衡量时，性别分配没有显着偏差（从 49% 到 57% 为男性）。对于除磷以外的所有货币（61% 男性），S. nutans 的性别分配均显着偏向男性（从 69% 到 81% 男性）。这是任何植物或动物雌雄同体中性别分配偏向雄性的第一个证据。尽管必要的条件可能并不常见，但在具有相似生殖生物学的其他物种中可能会发现偏雄性的分配。
It has been proposed that some wind-pollinated plants have the necessary conditions for an optimal sex allocation that is male biased, though there are few data that address this prediction. We determined that two prairie grass species (Andropogon gerardii and Sorghastrum nutans) had reproductive characteristics that theoretically would result in a male-biased allocation: both species were self-incompatible and neither species had increased seed set after supplemental hand pollination. The relative allocation to pollen and seed production was measured in terms of biomass, energy, nitrogen, phosphorus, potassium, magnesium, and calcium. Sex allocation in A. gerardii was significantly male biased (from 60 to 89% male) when measured in currencies of biomass, energy, potassium, and calcium; there was no significant bias in the sex allocation (from 49 to 57% male) when measured in currencies of nitrogen, phosphorus, and magnesium. Sex allocation in S. nutans was significantly male biased (from 69 to 81% male) for all currencies except phosphorus (61% male). This is the first evidence for male-biased sex allocation in any plant or animal hermaphrodite. Though the necessary conditions may be uncommon, male-biased allocation may be found in other species with similar reproductive biology.