A COST OF RESTORATION OF MALE FERTILITY IN A GYNODIOECIOUS SPECIES, LOBELIA SIPHILITICA
A COST OF RESTORATION OF MALE FERTILITY IN A GYNODIOECIOUS SPECIES, LOBELIA SIPHILITICA
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雌花两性花半边莲恢复雄性生育力的成本
DOI：
10.1111/j.0014-3820.2002.tb00142.x
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Maia F. Bailey
中科院分区：
文献类型：
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作者：
Maia F. Bailey
摘要允许雌性和雌雄同体在雌雄异株种群中共存的模型假设了一个简单的性别决定遗传系统，雌性的种子健身优势（补偿），以及核性别决定基因对健身的负多效性效应（恢复成本）。在半边莲中，性别由引起细胞质雄性不育（CMS）的线粒体基因和当存在特定CMS单倍型时恢复育性的核基因（核恢复体）决定。我在洛杉矶测试了修复成本。siphilitica通过测量恢复的雌雄同体的五个健身组件和估计的数量的核恢复与女性携带CMS 1和CMS 2的杂交。在解释适应性的回归模型中，恢复成本表现为显著的负系数（B）。我发现携带更多CMS 2核恢复基因（或更有效的恢复基因）的两性花具有较低的花粉活力（B =-1.08，P = 0.001）。这种花粉生活力的恢复成本在L。Siphilitica支持了恢复系的负多效性效应存在于含有雌性的雌株异株物种种群中的理论预测。这种成本的存在支持了雌蕊异花菌在自然界中可以是一个稳定的繁殖系统的观点。
Abstract Models allowing the coexistence of females and hermaphrodites in gynodioecious populations assume a simple genetic system of sex determination, a seed fitness advantage of females (compensation), and a negative pleiotropic effect of nuclear sex-determining genes on fitness (cost of restoration). In Lobelia siphilitica, sex is determined by both mitochondrial genes causing cytoplasmic male sterility (CMS) and nuclear genes that restore fertility when present with specific CMS haplotypes (nuclear restorers). I tested for a cost of restoration in L. siphilitica by measuring restored hermaphrodites for five fitness components and estimating the number of nuclear restorers by crosses with females carrying CMS1 and CMS2. A cost of restoration appears as a significant negative coefficient (B) in the regression model explaining fitness. I found that hermaphrodites carrying more nuclear restorer genes for CMS2 (or restorer genes of greater effect) have lower pollen viability (B = −1.08, P = 0.001). This pollen viability cost of restoration in L. siphilitica supports the theoretical prediction that negative pleiotropic effects of restorers will exist in populations of gynodioecious species containing females. The existence of such a cost supports the view that gynodioecy can be a stable breeding system in nature.