Evidence for effects of restorer genes on male and female reproductive functions of hermaphrodites in the gynodioecious species Thymus vulgaris L.
Evidence for effects of restorer genes on male and female reproductive functions of hermaphrodites in the gynodioecious species Thymus vulgaris L.
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恢复基因对雌花两性花异株百里香 (Thymus vulgaris L) 中雌雄同体的雄性和雌性生殖功能影响的证据。
DOI：
10.1046/j.1420-9101.1999.00056.x
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发表时间：
1999
影响因子：
2.1
通讯作者：
Atlan
中科院分区：
文献类型：
--
作者：
Gigord;Lavigne;Shykoff;Atlan
在百里香中，性别决定涉及细胞核和细胞质基因组：细胞质负责雄性不育（雌性表型），而特定的核基因可能恢复雄性生育能力（雌雄同体表型）。先前的观察表明，雌雄同体的花粉和种子生产存在很大差异。为了研究这种变异的起源，我们用来自三个不同父本种群的雌雄同体花粉对 12 株雌性植物（三个种群各四株）进行了手工授粉。测量了产生的性别比（即雌雄同体的频率）和这些后代的生殖功能。研究发现，一个家庭的性别比例与其雌雄同体的雌雄生殖功能之间存在很强的正相关关系。对于女性没有发现这种相关性。这一结果表明，恢复基因可能直接或间接参与性别决定和生殖功能资源分配的效率。因此，在性比低的家庭中，雌性优势（即雌性相对于雌雄同体的相对繁殖力）更大，这可能会影响这种雌雄异体繁殖系统的进化。
In Thymus vulgaris L., sex determination involves both the nuclear and the cytoplasmic genomes: the cytoplasm is responsible for male‐sterility (the female phenotype) while specific nuclear genes may restore male fertility (the hermaphrodite phenotype). Previous observations have shown high variation among hermaphrodites for pollen and seed production. In order to investigate the origin of this variation, 12 female plants, four from each of three populations, were hand‐pollinated with pollen from hermaphrodites from three different paternal populations. The sex‐ratio (i.e. the frequency of hermaphrodites) produced and the reproductive functions of these offspring were measured. A strong positive correlation was observed between the sex‐ratio within a family and both female and male reproductive functions of its hermaphrodites. No such correlation was found for females. This result suggests that restorer genes may be directly or indirectly involved both in sex determination and in the efficiency of resource allocation to reproductive functions. As a consequence, female advantage, i.e. the relative fecundity of females to hermaphrodites, is larger in families with low sex‐ratio, and this might affect the evolution of this gynodioecious breeding system.