Dimorphic Sexual Expression and Anisospory in Homalothecium sericeum Schimp. s.l. (Brachytheciaceae) in Portugal

IF 0.5 3区生物学 Q4 PLANT SCIENCES

Cryptogamie Bryologie Pub Date : 2020-10-06 DOI:10.5252/cryptogamie-bryologie2020v41a14

C. Sérgio, M. Sim-Sim, C. Garcia

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引用次数: 1

Abstract

ABSTRACT Among terrestrial plant species, male dwarfism (nannandry) is a unique feature of bryophytes, common in numerous dioicous pleurocarpous mosses. In this study, our objective was to describe and to elucidate the incidence of dwarf males in Portuguese populations of Homalothecium sericeum (Hedw.) Schimp and H. meridionale (M. Fleisch. & Warnst.) Hedenäs. We also evaluated the occurrence of sporophytes and of dwarf males, in 150 selected samples from the LISU herbarium collection. The results showed that most samples are heteromorphic, with sporophytes, and include dwarf males, independent marginal male branches and/or caducous brood branches as vegetative propagules. The samples containing only independent male plants are infrequent. Anisospory was observed in both species, with a perceptible bimodal distribution of spore size in both species. Moreover, in Portugal no differences were found between the two species of this complex concerning the presence and relative position of male plants, the occurrence of anisospory, or the strategies exhibited by male plants, such as nannandry and caducous branches.

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二态性表达及其各向异性。s.l.(蕨科)在葡萄牙

在陆生植物物种中，雄性侏儒症(nanannandry)是苔藓植物的一个独特特征，在许多雌雄异株胸果藓类植物中很常见。在这项研究中，我们的目的是描述和阐明侏儒雄性在葡萄牙Homalothecium sericeum (Hedw)种群中的发病率。Schimp和H. meridionale (M. Fleisch)& Warnst)。Hedenas。我们还评估了从LISU植物标本室收集的150个样本中孢子体和矮雄的发生情况。结果表明，大多数样品为异胚性，具有孢子体，包括矮生雄枝、独立的边缘雄枝和/或早落的幼枝作为营养繁殖体。只含有独立雄性植株的样品很少。两种植物均具有各向异性，孢子大小呈明显的双峰分布。此外，在葡萄牙，该复合体的两个物种在雄性植物的存在和相对位置、各向异性的发生或雄性植物表现出的策略(如楠枝和早落枝)方面没有发现差异。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cryptogamie Bryologie 生物-植物科学

CiteScore

2.10

自引率

25.00%

发文量

审稿时长

3 months

期刊介绍： Cryptogamie is a fully electronic journal, with a continuous publication stream, devoted to a wide diversity of cryptogamic topics, mainly in the taxonomic-phylogenetic field. Cryptogamie, Bryologie accepts articles on systematics as well as ecology and evolution of all of bryophytes. Thematic issues may also be published under the responsibility of a guest editor.