南荻野生居群的表型多样性及土壤养分对其表型的影响
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引用本文:郭孟齐,肖 亮,廖剑锋,易自力,薛 帅.南荻野生居群的表型多样性及土壤养分对其表型的影响[J].西北植物学报,2019,39(10):1868~1880
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作者单位
郭孟齐1,肖 亮1,2,廖剑锋1,2,易自力1,2,薛 帅1,2* (1 湖南农业大学 生物科学技术学院长沙 4101282 芒属植物生态应用技术湖南省工程实验室长沙 410128) 
基金项目:国家自然科学基金(31871693);
中文摘要:为明确中国南荻(Miscanthus lutarioriparius)野生居群的分布及其表型多样性,该研究对54个南荻野生居群的8种表型性状的多样性进行分析,并测定其土壤pH和肥力指标,分析土壤对南荻部分重要表型的影响及其相互关系。结果表明:(1)8种表型性状在居群间和居群内都存在极显著差异(P<0.01),且差异主要来自于居群内。(2)8种表型性状相互间具有明显的相关性,节数和茎粗与株高均呈极显著正相关关系(P<0.01),分枝数和株高与干物质产量均呈显著正相关关系(P<0.05),茎密度与大部分性状呈负相关关系,而最大节长与除株高外的其他表型性状都无显著相关性。(3)8种表型性状可降维成4个主成分因子(产量因子、株型因子、茎密度因子和最大节长因子),其累计贡献率为84.436%。(4)54个南荻野生居群可聚为两类,第Ⅰ类材料包含23个居群,材料来自长江下游及长江东北部,其株高较矮、产量较低,但茎密度、最大节长较大;第Ⅱ类材料包含31个居群,材料来自洞庭湖及长江中下游和长江西北部,其植株高大、产量高,而茎密度和最大节长较小。(5)大多数南荻生长的土壤pH接近中性且肥力较差,土壤有机质含量、速效钾含量对南荻株高和产量的影响最大,其直接通径系数分别为0.443、0.318及0.429、0.259。
中文关键词:南荻  野生居群  表型性状  多样性  土壤
 
Phenotypic Diversity of Natural Miscanthus lutarioriparius Populations and Effect of Soil Nutrients on Its Phenotypes
Abstract:In the present study, we selected 54 natural Miscanthus lutarioriparius populations to study their geographical distribution pattern and phenotypic diversity. These selected populations evenly distributed in the naturally occurrence range of M. lutarioriparius across China. Their phenotypic traits were measured during the field investigation conducted at the end of 2017 growing seasons, including the plant height, stem diameter, pitch number, length of the longest stem, branch number, shoot density, dry weight per stem and dry matter yield. And the soil pH and soil fertility were also determined. The effects of soil factors on these phenotypic traits and correlations between these phenotypic traits were further studied. Results showed that: (1) eight phenotypic traits were significantly (P<0.01) different between and within the 54 natural M. lutarioriparius populations, and the phenotypic variation mainly came from within the population. (2) There were significant correlations within these eight phenotypic traits. For example, the plant height positively correlated (P<0.01) with the pitch number and stem diameter, while significantly negative correlations existed between the shoot density and the other phenotypic traits. Length of the longest stem only had significant correlations with the plant height. (3) Information of the eight phenotypic traits were summarized to four principal component factors, namely the yield factor, plant type factor, shoot density factor and longest stem factor. These four principal component factors could reflect 84.436% phenotypic information of the 54 natural populations. (4) The 54 natural M. lutarioriparius populations were clustered into two groups based on the cluster analysis of their phenotypic traits. The first group contained 23 populations naturally distributing at the lower reaches and the northeast of the Yangtze River. The second group contained 31 populations mainly from the Dongting Lake area, the middle reaches and the northwest of the Yangtze River. Plants in the second group generally had higher plant height and biomass yield, smaller shoot density, thicker stem than that from the first group. (5) The natural M. lutarioriparius populations mostly grow on the infertile soil with a nearly neutral pH. The soil organic matter content and available potassium content had the greatest influence on the plant height of M. lutarioriparius, which was suggested by their high direct path coefficients of 0.443 and 0.318, respectively. That was also true for their effect on the biomass yield with their direct path coefficients of 0.259 and 0.429, respectively.
keywords:Miscanthus lutarioriparius  natural population  phenotypic traits  diversity  soil
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