贠平 楊婷 李曉龍 張文英



摘要:以34份陸地棉(Gossypium hirsutum Linn.)品種為材料,考查苗期澇漬脅迫及正常供水對照的苗高、主莖紅綠比、莖粗、葉片數、葉面積、SPAD值、地上部分鮮重、地上部分干重、地下部分鮮重、地下部分干重等性狀,以耐澇系數作為評價指標,采用主成分分析及聚類分析進行耐澇性綜合評價。利用耐澇度量值進行模糊聚類,將34個供試棉花品種耐澇性劃分為3類,聚類結果基本與供試材料的選育和種植區域的特點相符,其中新陸早19相對耐澇,新陸早36和蘇棉20相對敏感。
關鍵詞:陸地棉(Gossypium hirsutum Linn.);耐澇性;主成分分析;聚類分析
中圖分類號:S324 文獻標識碼:A 文章編號:0439-8114(2015)22-5520-05
Abstract: The morphological traits of seedling stage under waterlogging stress were studied for identifying and screening waterlogging-tolerance cotton cultivars. Principal component analysis and clustering analysis were used to evaluate the ability in waterlogging tolerance of 34 upland cotton cultivars based on the morphological traits in waterlogging stress. This included seedling height, red and green ratio, stem diameter, number of leaf, chlorophyll content, above-ground fresh weight, above-ground dry weight, underground fresh weight, underground dry weight and leaf area. The 34 cultivars could be divided into 3 clusters by Fuzzy Clustering based on their Waterlogging-tolerance Value(DV), which could match with the waterlogging characteristics of the origins and planting areas of those cultivars.
Key words: cotton(Gossypium hirsutum Linn.);flooding tolerance;principal component analysis;cluster analysis
棉花(Gossypium hirsutum Linn.)是全球最重要的纖維作物,也是重要的油料作物。然而,中國長江流域棉區常常遭受澇漬危害,這成為當前長江流域棉花產業穩定發展的一大挑戰[1,2]。為了應對澇漬脅迫,對耐澇性進行針對性遺傳改良已迫在眉睫,其中耐濕種質資源的鑒定與篩選至關重要。
近年來,針對作物耐濕性鑒定國內外提出多種鑒定方法,在生理、生化、形態、產量等鑒定指標上開展了研究[3-9]。利用單一指標鑒定品種耐濕性易受環境影響,利用隸屬函數法進行多指標評價時又會因為各指標間存在不同程度的相關性,導致各單項指標提供的信息發生重疊,難以得出可靠的結果,影響鑒定效果[10]。主成分分析是將多指標線性組合為較少的綜合指標,這些綜合指標彼此間既不相關,又能反映原來多指標的信息[11],已有應用于作物多指標耐濕性綜合評價的報道[12-15]。……