Microsatellite Analysis of the Breeding System and Seed Dispersal in Shorea leprosula (Dipterocarpaceae)
Microsatellite Analysis of the Breeding System and Seed Dispersal in Shorea leprosula (Dipterocarpaceae)
复制标题
麻风望天树（龙脑香科）繁殖系统和种子传播的微卫星分析
DOI：
10.1086/317902
复制
发表时间：
2001
影响因子：
2.3
通讯作者：
N. Muhammad
中科院分区：
文献类型：
--
作者：
T. Nagamitsu;S. Ichikawa;M. Ozawa;Ryouhei Shimamura;N. Kachi;Y. Tsumura;N. Muhammad
为了了解马来西亚半岛麻风望天树（龙脑香科）的繁殖系统和种子传播，对落在五棵树树冠下的垃圾陷阱中的未成熟和成熟果实的胚胎进行了微卫星分析。由树木和其他树木分散的异交和自交后代通过三个多态性微卫星位点的基因型来区分。蓟马授粉的麻风花中成熟果实胚胎的平均异交率（0.91）并不低于之前报道的蜜蜂授粉的望天树属物种的平均异交率，尽管蓟马似乎是不如蜜蜂有效的传粉媒介。尽管五棵树中的四棵在果实成熟过程中表现出高且稳定的异交率，但在一棵具有未成熟果实的高度自交胚胎的树中，异交率有所增加。这些结果表明，果实成熟过程中的近交抑制以及自交不亲和性降低了近交胚胎的比例。树冠下的果实中从邻近树分散的果实的比例平均值为0.20，并且在未成熟果实自交胚胎高度的树下最低。这棵树下分散的果实比例较低，表明这棵树与繁殖邻居的距离很远，这可能会减少异花授粉。
To understand the breeding system and seed dispersal in Shorea leprosula (Dipterocarpaceae) in Peninsular Malaysia, a microsatellite analysis was conducted of embryos of immature and mature fruits fallen in litter traps under the crowns of five trees. Outcrossed and selfed progeny mothered by the trees and those dispersed from other trees were distinguished by genotypes of three polymorphic microsatellite loci. The mean outcrossing rate of mature fruit embryos in S. leprosula pollinated by thrips (0.91) was not lower than those previously reported from Shorea species pollinated by bees, even though thrips seem to be less efficient pollinators than bees. Although four of the five trees showed high and stable outcrossing rates during fruit maturation, the outcrossing rate increased in one tree with highly selfed embryos of immature fruits. These results suggest that inbreeding depression during fruit maturation as well as self‐incompatibility reduce the proportion of inbred embryos. The proportion of fruits dispersed from neighbor trees in fruits trapped under a tree crown had a mean value of 0.20 and was lowest under the tree with highly selfed embryos of immature fruits. This low fraction of dispersed fruits under this tree suggests long distances from this tree to reproductive neighbors, which may reduce cross pollination.