Outcrossing rates in the gynomonoecious-gynodioecious species Dianthus sylvestris (Caryophyllaceae)
Outcrossing rates in the gynomonoecious-gynodioecious species Dianthus sylvestris (Caryophyllaceae)
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DOI：
10.3732/ajb.90.4.579
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发表时间：
2003-04-01
影响因子：
3
通讯作者：
Shykoff, JA
中科院分区：
文献类型：
--
作者：
Collin, CL;Shykoff, JA
有些被描述为雌蕊异株的物种是真正的雌蕊同株-雌蕊异株。三种不同的表型可以在它们的自然种群中找到-雌性和雌雄同体的纯性别植物，分别只生雌花或完全花，以及生两种类型花的混合植物。在这样一个物种，石竹，我们研究了交配系统参数使用等位酶数据。计算了三种类型植株的异交率和异交父本的相关性，并分别计算了混合植株上雌花和完全花的异交率和异交父本的相关性。群体的平均异交率为t（m）+/- SD = 0.885 +/- 0.032。雌性比两性异交更多（分别为0.987 +/- 0.112和0.790 +/- 0.076），而混合植物比两性异交并不显著更多或更少（0.840 +/- 0.060）。在混合植株中，完全花表现出中等的异交率（0.898 +/- 0.057），而雌花与雌雄同体植株上的完全花一样自交（0.782 +/- 0.111）。异交率的家庭估计是高度可变的。在全球范围内，没有双亲近亲繁殖在这个物种中被检测到，有一个家庭内的全同胞的平均值为61.5 +/- 19.9%。小雌蕊和大的完美的花朵之间的花的二型性以及传粉者对较大花朵的偏好可以解释这两个交配参数所观察到的模式。讨论了雌核单胞菌-雌核双胞菌的优点。我们的结论是，混合植物不减少自交的植物上的所有花，但完美的花在这些植物似乎有异交优势。
Some species described as gynodioecious are truly gynomonoecious-gynodioecious. Three distinct phenotypes may be found in their natural populations-female and hermaphrodite pure-sexed plants bearing either only pistillate or perfect flowers, respectively, and mixed plants bearing both types of flowers. In one such species, Dianthus sylvestris, we investigated mating system parameters using allozyme data. Outcrossing rates and correlations of outcrossed paternity were calculated for the three types of plants and separately for pistillate and perfect flowers on mixed plants. The mean outcrossing rate for the population was t(m) +/- SD = 0.885 +/- 0.032. Females were more outcrossed than hermaphrodites (0.987 +/- 0.112 and 0.790 +/- 0.076, respectively), whereas mixed plants were not significantly more or less outcrossed than hermaphrodites (0.840 +/- 0.060). Within mixed plants, perfect flowers showed an intermediate outcrossing rate (0.898 +/- 0.057), whereas pistillate flowers were as selfed as perfect flowers on hermaphrodite plants (0.782 +/- 0.111). Family estimates of outcrossing rates were highly variable. Globally, no biparental inbreeding was detected in this species, and there was a mean of 61.5 +/- 19.9% of full-sibs within families. Floral dimorphism between small pistillate and large perfect flowers together with pollinator preference for larger flowers could explain the observed patterns for both mating parameters. The advantages of gynomonoecy-gynodioecy are discussed. We conclude that mixed plants do not reduce selfing for all flowers on a plant, but perfect flowers on these plants seem to have an outcrossing advantage.