不同微生境毛尖紫萼藓形态结构性状差异性与协变特征  

Differences in morphological traits and covariation characteristics of Grimmia pilifera in different microhabitats

作　　者：代玲 张梦玉 邱东 马晓东[1] DAI Ling;ZHANG Mengyu;QIU Dong;MA Xiaodong(College of Life Sciences/Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology,Xinjiang Normal University,Urumqi 830054,China;State Key Laboratory of Desert and Oasis Ecology,Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui,College of Life Sciences,Anqing Normal University,Anqing,Anhui 246133,China)

机构地区：[1]新疆师范大学生命科学学院/新疆特殊环境物种保护与调控生物学实验室,新疆乌鲁木齐830054 [2]中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室/干旱区生态安全与可持续发展重点实验室,新疆乌鲁木齐830011 [3]安庆师范大学生命科学学院/皖西南生物多样性研究与生态保护安徽省重点实验室,安徽安庆246133

出　　处：《江西农业大学学报》2024年第3期726-735,共10页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金项目(42201072);新疆维吾尔自治区自然科学基金项目(2022D01A355)。

摘　　要：【目的】毛尖紫萼藓(Grimmia pilifera)是典型的石生耐旱藓类,广布于我国南北各省,其生长往往受到干旱和贫瘠生长环境的限制,是自然界的拓荒者之一。研究不同微生境中毛尖紫萼藓形态结构性状的差异性与协变特征,为开展藓类植物耐旱机理研究及深入揭示石生耐旱藓类在不同微环境的适应机制提供基础数据。【方法】以3种不同遮荫程度微生境(竹林开放式遮蔽岩石S_(1)、向阳裸岩E、薜荔完全遮蔽岩石S_(2))下的毛尖紫萼藓为研究对象,通过测定15个形态结构性状,即7个单株性状(中部叶片夹角、中部叶长度、中部毛尖长度、上部毛尖长度、植株高度、带毛尖的植株宽度、不带毛尖的植株宽度)和8个茎叶微结构性状(茎横截面长、茎横截面宽、茎中部细胞长、茎中部细胞宽、茎细胞密度、叶中肋宽、叶细胞长、叶细胞宽),计算各性状的变异系数,探究其形态结构性状在不同微生境间的差异性与协变特征。【结果】在单株性状中,株高、植株宽度、植株宽度(带毛尖)、叶片夹角和中部叶长最大值均出现在S_(1)生境,最小值多出现在E生境,而中部毛尖长为S_(2)>E>S_(1)。无论何种微生境,毛尖长度的变异性均较高。在茎叶微结构性状中,茎细胞长、叶细胞长及叶细胞宽均表现为S_(1)生境显著高于E生境,其他5个茎叶微结构性状在3个微生境间无显著差异(P>0.05)。叶细胞在S_(1)生境中最大,S_(2)生境中次之,E生境中最小。所有性状均属于中等以下程度变异,具有一定的可塑性。主成分分析表明,不同微生境下毛尖紫萼藓15个性状间的协变特征不完全一致,且呈现较明显的分异特征,其中S_(1)生境的毛尖紫萼藓综合生长性能相对较好。【结论】在3种不同微生境下,毛尖紫萼藓形态结构性状所反映的生长性能表现为:S_(1)>S_(2)>E。毛尖紫萼藓功能性状间具有一定的协变趋势,但出现�[Objective]Grimmia pilifera is a typical drought-tolerant saxicolous moss species,which is widely distributed in northern and southern provinces of China.Its growth is often limited by drought and barren growth environment,and it is one of the pioneers in nature.To study the differences and covariant characteristics of morphological and structural traits of G.pilifera in different microhabitats,so as to provide basic data for the study of the drought tolerance mechanism of mosses and the in-depth revelation of the adaptation mechanism of drought-tolerant saxicolous mosses in different microenvironments.[Method]G.pilifera individuals were used to study the differences and covariant characteristics of various traits in three microhabitats with different shading degrees.Habitat S_(1)was bare rock shaded openly by bamboo individuals,habitat E was exposed rock,and habitat S_(2)was bare rock shaded completely by Ficus pumila individuals.The 15 studied morphological and structural traits were 7 single plant traits(including middle blade angle,middle leaf length,middle hair length,up hair length,plant height,plant width with hairs,plant width without hairs.)and 8 stem and leaf microstructure traits(including stem length,stem width,cell length in stem,cell width in stem,stem cell density,thickness of leaf midrib,cell length in leaf,cell width in leaf.).The variable coefficient of each trait was measured and calculated.[Result]Among the single plant traits,the maximum values of plant height,plant width,plant width(with leaf hairs),leaf angle,and middle leaf length all appeared in habitat S_(1).Moreover,the minimum values were found mostly in habitat E,whereas the middle hair length showed the order of S_(2)>E>S_(1).No matter what kind of microhabitat,the variability of hair length is higher than other traits.Among the stem and leaf microstructure traits,the cell length in stem,cell length in leaf,and cell width in leaf were significantly higher in habitat S_(1)than that in habitat E,whereas the other five stem and leaf mic

关 键 词：毛尖紫萼藓 微生境 功能性状 茎 叶 协变 

分 类 号：Q948[生物学—植物学]