田美虹,郭孟齐,易自力,黄红梅,陈智勇,肖亮,薛帅?.华东植物区系芒属植物的表型遗传多样性研究[J].湖南农业大学学报:自然科学版,2019,45(4):.
华东植物区系芒属植物的表型遗传多样性研究
  
DOI:
中文关键词:    五节芒    南荻  表型性状  华东植物区系  遗传多样性
英文关键词:Miscanthus sinensis  Miscanthus floridulus  Miscanthus sacchariflorus  Miscanthus lutarioriparius  phenotypic  East China floristic region  genetic diversity
基金项目:国家自然科学基金项目(31871693)
作者单位
田美虹,郭孟齐,易自力,黄红梅,陈智勇,肖亮,薛帅? 1.湖南农业大学生物科学技术学院湖南 长沙 4101282.芒属植物生态应用技术湖南省工程实验室湖南 长沙 410128 
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中文摘要:
      为研究芒草在其重叠分布区内表型性状的遗传多样性,以来自于华东植物区系内的36份芒、五节芒、荻和南荻为材料,对8种表型性状进行多因素方差分析、变异分析和聚类分析。结果表明:8种表型性状种间差异大小依次为分蘖数、基部直径、干物质产量、花序长、株高、最大叶长、最大叶宽、叶长宽比,在种内除最大叶宽与叶长宽比呈显著差异(P<0.05)外,其余6种表型均呈极显著差异(P<0.01),且8种表型性状在种间和种内存在极显著互作效应;该区系内芒属植物表型变异系数为7.94%~76.80%,Shannon’s指数为1.27~1.78,芒草表型变异系数大小依次为芒(26.16%)、南荻(25.46%)、荻(24.49%)、五节芒(17.17%),Shannon’s指数大小依次为芒(1.74)、南荻(1.70)、五节芒(1.68)、荻(1.60);4种芒属植物在欧式距离为20时可分为3类,荻为第Ⅰ类,芒和五节芒为第Ⅱ类,南荻为第Ⅲ类;在华东植物区系内,芒的株高与纬度呈极显著负相关,芒的干物质产量与海拔高度呈显著正相关,荻的干物质产量、分蘖数和基部直径与纬度呈显著或极显著负相关,而南荻与五节芒的产量因子表型与地理因子间则无显著相关性。
英文摘要:
      In this study, 36 samples of Miscanthus spp. including four species (M.sinensis, M.floridulus, M.sacchariflorus, M.lutarioriparius) from East China region were used to study the genetic diversity of the phenotypic characters of Miscanthus spp. during their overlapping region. Their 8 phenotypes were subject to multivariate variance analysis, correlation analysis, clustering analysis. The results showed the interspecific difference trend in the studied phenotypes of Miscanthus spp. decreases as the following order, tiller number, basal diameter, dry matter yield, inflorescence length, plant height, maximum leaf length, maximum leaf width, ratio of leaf length to width. The maximum leaf width and ratio of leaf length to width showed significant interspecific difference with P<0.05 and the other six phenotypic characters showed significant difference within the species P<0.01. And, there were significant interaction effects of eight phenotypic traits among and within species. The variation coefficient of all eight phenotypic traits was in the range from 7.94% to76.80%, and the Shannon’s index of all eight phenotypic traits was ranged from 1.27 to 1.78. The variation coefficient trend of four Miscanthus species was as follows: M.sinensis(26.16%), M.lutarioriparius(25.46%), M.sacchariflorus(24.49%), M.floridulus (17.17%). The Shannon’s index trend of the four Miscanthus species was M.sinensis (1.74), M.lutarioriparius (1.70), M.floridulus (1.68), M.sacchariflorus (1.60). The 36 Miscanthus germplasms could be clustered into three groups based on the euclidean distance at 20: all M.sacchariflorus species, in Ⅰ class, all M.sinensis and M.floridulus species in Ⅱ class, and all M.lutarioriparius species in Ⅲ class. The plant heigh of M.sinensis and latitude were significantly negatively correlated, the dry matter yield of M.sinensis was significant positively correlated with the altitude. The dry matter yield, tiller number and base diameter of M.sacchariflorus were negatively correlated with the latitude, while the yield factor phenotype of M.floridulus and M.lutarioriparius were not significantly correlated with geographical factors.
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