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首页> 外文期刊>Journal of Bryology >Sexual reproduction in the phyllodioicous bryophyte Homalothecium lutescens (Hedw.) H.Rob, in relation to habitat age, growth conditions and genetic variation
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Sexual reproduction in the phyllodioicous bryophyte Homalothecium lutescens (Hedw.) H.Rob, in relation to habitat age, growth conditions and genetic variation

机译：与生境年龄，生长条件和遗传变异有关的叶二生苔藓植物Homothecium lutescens（Hedw。）H.Rob的有性生殖

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摘要

Sporophyte production and female fertility were investigated in seventeen calcareous grassland demes of the moss Homalothecium lutescens (Hedw.) H.Rob, on the Baltic island of Oland, with the aim of understanding the relationships between sexual reproduction, habitat age, genetic variation and factors related to growth conditions. The overall proportion of fertile female shoots (with perichaetia) was 35%. Fertility status at the level of individual shoots was positively associated with shoot length and density, while within deme fertility was positively associated with bush cover. There was no association between female fertility and habitat age, genetic diversity (H_s) or allelic richness. Out of 1344 investigated shoots, only two were normal-sizedfertile males. Dwarf males were also extremely rare, and found almost exclusively on shoots with sporophytes. Few sporophytes were observed (in the two demes with highest fertility and bush cover). No relationship between genetic variation and the frequency of sporophytes and males was found. The lack of a relationship between sexual reproduction and genetic variation suggests that sexual reproduction may not occur in the same grassland fragments as the recruitment of new clones (from spores or vegetative fragments). The majority of the dry, open grassland habitats, where H. lutescens is typically found in the study area, appear to be suboptimal for both dwarf males and fertilization. Sexual reproduction is more likely to occur in shaded (although grazed) grassland patches, where moisture levels are likely to be higher and the moss colonies are generally more vigorous.
机译：在波罗的海厄兰岛上的十七个石灰岩草地上研究了孢子体的产量和雌性育性，目的是了解有性繁殖，生境年龄，遗传变异和因素之间的关系。与生长条件有关。可育的雌性芽（伴有近足症）的总比例为35％。个体嫩芽水平上的育性状况与嫩芽长度和密度成正相关，而近乎适度的生育能力与灌木丛呈正相关。女性生育力与栖息地年龄，遗传多样性（H_s）或等位基因丰富度之间没有关联。在调查的1344个芽中，只有两个是正常大小的可育雄性。矮小雄性也极为罕见，几乎只在带有孢子体的芽中发现。几乎没有观察到孢子体（在两个生育率最高且灌木丛覆盖的地区）。遗传变异与孢子体和雄性的频率之间没有关系。有性繁殖与遗传变异之间缺乏联系，这表明有性繁殖可能与募集新克隆（从孢子或营养片段）在同一草地片段中发生。在矮矮的雄性和施肥中，大多数干燥，开阔的草原生境（通常在研究区中发现了黄褐线虫）似乎都不理想。在有阴影（尽管是放牧）的草地上，有性繁殖更容易发生，那里的水分含量可能更高，而苔藓菌落通常更活跃。

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