Spatiotemporal mating pattern variation in a wind-pollinated Mediterranean shrub
Spatiotemporal mating pattern variation in a wind-pollinated Mediterranean shrub
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DOI：
10.1111/j.1365-294x.2009.04415.x
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发表时间：
2009-12-01
影响因子：
4.9
通讯作者：
Aparicio, Abelardo
中科院分区：
文献类型：
--
作者：
Albaladejo, Rafael G.;Gonzalez-Martinez, Santiago C.;Aparicio, Abelardo
在风媒植物中，交配模式的时空变化知之甚少。在这里，我们分析了交配模式的风授粉雌雄异株灌木阿月浑子lentiscus基因分型904种子从30个母株与8个微卫星标记在一个高密度的人口在连续两个开花季节。我们发现，在一些交配系统的估计年之间的显着差异，特别是在相关的亲子关系的水平。总体而言，2007年母亲内部的亲子关系高于2006年（r（pWM）= 0.085和0.030），这意味着父亲的有效数量（N-ep）分别为11.8和33.6。使用平滑插值技术，我们表明，有效的花粉云的空间结构在补丁的高和低的遗传多样性，不保持恒定，每年。在2006年，亲-母相关亲子关系（r（pAM））没有表现出任何趋势与距离，这表明没有限制花粉传播。然而，在2007年，r（pAM）在短距离大于零，揭示了小规模的花粉传播模式的存在。事实上，研究的季节是气候均匀的开花时间表明，所观察到的差异可能归因于年间的物候变化的个人在研究人口或其他（未知）的因素。数值模拟，基于真实的数据集，表明男性的丛生和植物密度降低，这是与不同类型的花粉限制，大大增加了相关的交配在这个风授粉的物种，这是相关的框架下的持续人为栖息地地中海生态系统遭受干扰。
Spatiotemporal variation in mating patterns is poorly known in wind-pollinated plant species. Here, we analysed mating patterns of the wind-pollinated dioecious shrub Pistacia lentiscus by genotyping 904 seeds from 30 mother plants with eight microsatellite markers in a high-density population in two consecutive flowering seasons. We found significant differences in some mating system estimates between years, particularly in the levels of correlated paternity. Overall, within-mothers correlated paternity was higher in 2007 than in 2006 (r(pWM) = 0.085 and 0.030), which translated into an effective number of fathers (N-ep) of 11.8 and 33.6 respectively. Using a smoothing interpolation technique, we show that the effective pollen cloud was spatially structured in patches of high- and low-genetic diversity, which do not remain constant from year to year. In 2006, the among-mothers correlated paternity (r(pAM)) showed no trend with distance, suggesting no restriction of pollen dispersal. However, in 2007, r(pAM) was greater than zero at short distances, revealing the existence of small-scale patterns of pollen dispersal. The fact that the studied seasons were climatically homogeneous during the flowering time suggested that the observed differences might be ascribed to between-year phenological variation of individuals in the studied population or other (unknown) factors. Numerical simulations, based on the real data set, indicated that the clumping of males and decreasing plant density, which is related to different types of pollen limitation, greatly increase correlated mating in this wind-pollinated species, which is of relevance under the frame of the continuous anthropogenic habitat disturbance suffered by Mediterranean ecosystems.