目的:苔藓孢子体的大小和生物量分配差异很大,可能反映生殖和传播策略。了解孢子体性状如何协调对于了解苔藓的功能和进化至关重要。这项研究旨在回答:1)苔藓种类之间的孢子体大小和比例如何不同,有和没有突出的刚毛中心链,2)seta解剖和形态特征是如何相关的,和3)孢子体生物量与配子体生物量和养分浓度的关系。
方法:我们研究了刚毛解剖和形态性状之间的关系,seta的生物量,胶囊,和配子体,碳,氮,27种亚热带山地苔藓的磷浓度。
结果:1)具有突出的刚毛中心链的苔藓物种比没有的苔藓物种具有更大的刚毛和更重的胶囊。2)随着结扎长度的增加,两组的刚毛变得更厚更圆,而在具有突出中心链的物种中,运输细胞与表皮的面积比降低;3)在两组中,具有较大配子体生物量的苔藓倾向于具有较重的孢子体,但配子体氮磷浓度与孢子体性状无关。
结论:我们的研究强调了刚毛中央链可能具有重要的功能作用并影响苔藓孢子体的异速变化。孢子体形态和解剖特征的协调变化遵循圆柱形结构的基本生物力学原理,这些特征仅与配子体营养浓度弱相关。关于苔藓孢子体功能性状及其与配子体关系的研究仍处于起步阶段,但可以为其适应策略提供重要见解。本文受版权保护。保留所有权利。
Moss sporophytes differ strongly in size and biomass partitioning, potentially reflecting reproductive and dispersal strategies. Understanding how sporophyte traits are coordinated is essential for understanding moss functioning and evolution. This study aimed to answer: (1) how the size and proportions of the sporophyte differ between moss species with and without a prominent central strand in the seta, (2) how anatomical and morphological traits of the seta are related, and (3) how sporophytic biomass relates to gametophytic biomass and nutrient concentrations.
We studied the relationships between seta anatomical and morphological traits, the biomass of seta, capsule, and gametophyte, and carbon, nitrogen, and phosphorus concentrations of 27 subtropical montane moss species.
(1) Moss species with a prominent central strand in the seta had larger setae and heavier capsules than those without a prominent strand. (2) With increasing seta length, setae became thicker and more rounded for both groups, while in species with a prominent central strand, the ratio of transport-cell area to epidermal area decreased. (3) In both groups, mosses with greater gametophytic biomass tended to have heavier sporophytes, but nitrogen and phosphorus concentrations in the gametophyte were unrelated to sporophytic traits.
Our study highlights that the central strand in the seta may have an important functional role and affect the allometry of moss sporophytes. The coordinated variations in sporophyte morphological and anatomical traits follow basic biomechanical principles of cylinder-like structures, and these traits relate only weakly to the gametophytic nutrient concentrations. Research on moss sporophyte functional traits and their relationships to gametophytes is still in its infancy but could provide important insights into their adaptative strategies.