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望天树(龙脑香科)种子和幼苗的自交及近亲繁殖衰退

Selfing and inbreeding depression in seeds and seedlings of Neobalanocarpus heimii (Dipterocarpaceae).

作者信息

Naito Yoko, Konuma Akihiro, Iwata Hiroyoshi, Suyama Yoshihisa, Seiwa Kenji, Okuda Toshinori, Lee Soon Leong, Muhammad Norwati, Tsumura Yoshihiko

机构信息

Graduate School of Agriculture, Kyoto University, Kyoto, Japan.

出版信息

J Plant Res. 2005 Dec;118(6):423-30. doi: 10.1007/s10265-005-0245-z. Epub 2005 Nov 9.

Abstract

We evaluated the degree of selfing and inbreeding depression at the seed and seedling stages of a threatened tropical canopy tree, Neobalanocarpus heimii, using microsatellite markers. Selection resulted in an overall decrease in the level of surviving selfed progeny from seeds to established seedlings, indicating inbreeding depression during seedling establishment. Mean seed mass of selfed progeny was lower than that of outcrossed progeny. Since the smaller seeds suffered a fitness disadvantage at germination in N. heimii, the reduced seed mass of selfed progeny would be one of the determinants of the observed inbreeding depression during seedling establishment. High selfing rates in some mother trees could be attributed to low local densities of reproductive individuals, thus maintenance of a sufficiently high density of mature N. heimii should facilitate regeneration and conservation of the species.

摘要

我们使用微卫星标记评估了一种濒危热带冠层树木——望天树(Neobalanocarpus heimii)在种子和幼苗阶段的自交程度和近交衰退情况。选择导致从种子到已定植幼苗阶段存活的自交后代水平总体下降,这表明在幼苗定植过程中存在近交衰退。自交后代的平均种子质量低于异交后代。由于在望天树中较小的种子在萌发时具有适合度劣势,自交后代种子质量的降低将是观察到的幼苗定植过程中近交衰退的决定因素之一。一些母树的高自交率可能归因于繁殖个体的局部密度较低,因此维持足够高的望天树成熟个体密度应有助于该物种的更新和保护。

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