Interspecific variation in pollen-ovule ratio is negatively correlated with pollen transfer efficiency in a natural community
Interspecific variation in pollen-ovule ratio is negatively correlated with pollen transfer efficiency in a natural community
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自然群落中花粉胚珠比率的种间变异与花粉转移效率呈负相关
DOI：
10.1111/plb.12151
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发表时间：
2014-07-01
期刊：
影响因子：
3.9
通讯作者：
Huang, S. -Q.
中科院分区：
文献类型：
--
作者：
Gong, Y. -B.;Huang, S. -Q.
授粉效率假说一直被用来解释花粉-胚珠（P：O）比值的种间差异。然而，没有经验研究的P：O比直接和定量测量花粉传递效率（PE）。在这里，我们使用PE指数，定义为花粉粒的比例从花药，随后沉积在同种柱头，作为PE的直接和定量的措施。我们调查了P：O比，花粉去除和花粉沉积在26种植物在高寒草甸，在连续三年。我们的社区调查表明，近5%的去除花粉成功地沉积在同种柱头上。各物种间的PE指数变化范围为0.01%~ 78.56%，与P：O比值呈负相关。这种相关性并没有改变控制物种之间的系统发育关系，这表明P：O比的种间变异可以归因于花粉粒到达柱头的概率。结果表明，授粉效率假说有助于解释P：O比值的种间变异。
The pollination efficiency hypothesis has long been proposed as an explanation for interspecific variation in pollen-ovule (P:O) ratios. However, no empirical study on P:O ratios has directly and quantitatively measured pollen transfer efficiency (PE). Here, we use a PE index, defined as the proportion of pollen grains removed from anthers that are subsequently deposited on conspecific stigmas, as a direct and quantitative measure of PE. We investigated P:O ratios, pollen removal and pollen deposition in 26 plant species in an alpine meadow, over three consecutive years. Our community survey showed that nearly 5% of removed pollen was successfully deposited on conspecific stigmas. The PE index ranged from 0.01% up to 78.56% among species, and correlated negatively with the P:O ratio across years. This correlation was not changed by controlling for phylogenetic relationships among species, suggesting that the interspecific variation in P:O ratios can be attributed to the probability of pollen grains reaching a stigma. The results indicate that the pollination efficiency hypothesis can help to explain interspecific variation in P:O ratios.