Variation in pheno-morphological and agronomic traits among burr medic (Medicago polymorpha L.) populations collected in Sicily, Italy
Variation in pheno-morphological and agronomic traits among burr medic (Medicago polymorpha L.) populations collected in Sicily, Italy
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DOI：
10.1071/cp09116
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发表时间：
2010-01-01
影响因子：
1.9
通讯作者：
Giambalvo, D.
中科院分区：
文献类型：
--
作者：
Graziano, D.;Di Giorgio, G.;Giambalvo, D.
本研究对西西里岛不同环境下31个毛刺自然居群的表型形态和农艺性状多样性进行了评价，并分析了各采集点表型多样性与环境参数的关系。3个商品品种（Cavalier、Santiago和Anglona）也作为对照品种纳入研究。2005- 2006年在西西里内陆丘陵地区进行了两次实地试验。利用地理、气候和土壤学数据对采集点进行主成分分析（PCA），评价采集点类型的差异。利用表型形态和农艺数据对材料进行主成分分析，以确定不同性状在解释多变量多态性中的重要性。西西里毛刺种群在所有记录的表型形态和农艺性状上都表现出极显著的种群间差异，而且一些种群的农艺性状比对照品种更明显。主成分分析并没有明显区分不同生境的植物，但在某些情况下，同一生境的植物有聚集在一起的趋势。来自干旱和温暖栖息地的种群比来自潮湿和寒冷栖息地的种群开花更早，产量也更低。西西里种群在表型形态和农艺性状上的巨大差异可能对在地中海地区寻找适合的多形支原体材料用于牧场和作物-牲畜养殖系统有价值。
The present study assessed the diversity of pheno-morphological and agronomic traits among 31 natural populations of burr medic (Medicago polymorpha L.) from different environments throughout Sicily, and analysed the patterns of phenotypic diversity in relation to the environmental parameters of each collection site. Three commercial cultivars (Cavalier, Santiago, and Anglona) were also included in the study as check cultivars. Two field experiments were performed in 2005-06 in a hilly area of the Sicilian inland. Principal components analysis (PCA) was performed on the sites using geographic, climatic, and pedological data to assess the differences in types of collection sites. PCA was also performed on the accessions using pheno-morphological and agronomic data to establish the importance of different traits in explaining multivariate polymorphisms. Sicilian burr medic populations showed highly significant inter-population differences for all of the recorded pheno-morphological and agronomic traits, and several populations had agronomic attributes that were more pronounced than those of the check cultivars. PCA did not clearly differentiate the accessions according to their habitats of origin, but in some cases, accessions from the same habitat had a tendency to stay together. Populations from drier and warmer habitats flowered earlier and were less productive than those from wetter and colder ones. The large variability in both pheno-morphological and agronomic traits among Sicilian populations may be valuable when searching for suitable M. polymorpha material to exploit in pastures and crop-livestock farming systems in the Mediterranean region.