蓝桉是否存在隐性自交不亲和现象？
Is Eucalyptus Cryptically Self-incompatible?
作者信息
Horsley Tasmien N, Johnson Steven D
机构信息
School of Biological and Conservation Sciences, University of KwaZulu-Natal, Scottsville, South Africa.
出版信息
Ann Bot. 2007 Dec;100(6):1373-8. doi: 10.1093/aob/mcm223. Epub 2007 Sep 19.
BACKGROUND AND AIMS
The probability that seeds will be fertilized from self- versus cross-pollen depends strongly on whether plants have self-incompatibility systems, and how these systems influence the fate of pollen tubes.
METHODS
In this study of breeding systems in Eucalyptus urophylla and Eucalyptus grandis, epifluorescence microscopy was used to study pollen tube growth in styles following self- and cross-pollinations.
KEY RESULTS
Pollen tubes from self-pollen took significantly longer than those from cross-pollen to grow to the base of the style in both E. urophylla (120 h vs. 96 h) and E. grandis (96 h vs. 72 h). In addition, both species exhibited reduced seed yields following self-pollination compared with cross-pollination.
CONCLUSIONS
The present observations suggest that, in addition to a late-acting self-incompatibility barrier, cryptic self-incompatibility could be a mechanism responsible for the preferential out-crossing system in these two eucalypt species.
背景与目的
种子由自花花粉与异花花粉受精的概率在很大程度上取决于植物是否具有自交不亲和系统，以及这些系统如何影响花粉管的命运。
方法
在这项对尾叶桉和巨桉育种系统的研究中，利用落射荧光显微镜研究了自花授粉和异花授粉后花柱中花粉管的生长情况。
关键结果
在尾叶桉（120小时对96小时）和巨桉（96小时对72小时）中，自花花粉的花粉管生长至花柱基部的时间均显著长于异花花粉的花粉管。此外，与异花授粉相比，这两个物种自花授粉后的种子产量均有所降低。
结论
目前的观察结果表明，除了后期起作用的自交不亲和障碍外，隐性自交不亲和可能是这两种桉属物种优先异交系统的一种机制。
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