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旨在阐明高海拔生态条件下小麦品种顶二叶光合特性与产量的关系,为高产栽培和高产育种提供理论依据.试验于2013-2014年在云南丽江以云南省主栽的5个小麦品种为供试材料,研究了不同品种顶二叶叶面积、叶绿素SPAD值、根系性状差异及与籽粒产量的关系.结果表明,不同小麦品种在开花期顶二叶叶面积、开花期和成熟期顶二叶叶绿素SPAD值、根系性状(次生根根数、根长和根干质量)上差异有统计学意义.倒二叶和顶二叶叶面积与籽粒产量呈极显著正相关,但旗叶叶面积与籽粒产量相关性无统计学意义.成熟期旗叶、倒二叶和顶二叶叶绿素SPAD值与籽粒产量分别呈显著或极显著正相关,开花期、成熟期旗叶和倒二叶叶绿素SPAD值与叶面积的乘积和籽粒产量分别呈显著或极显著正相关.高海拔生态区次生根根系发达、生育后期顶二叶维持相对较大叶面积和较高叶绿素SPAD值的协调型小麦品种(如云麦53)具有较大增产潜力.
The aim of this study is to elucidate the relationship between photosynthetic characteristics and yield of top two leaves of wheat cultivars under high altitude ecological conditions and to provide theoretical basis for high yielding and high yield breeding.The experiment was conducted in 2013-2014 in Lijiang, The results showed that the leaf area, flowering stage and maturity stage of the top two leaf of different wheat cultivars at the flowering stage were the highest, Leaf SPAD value, root traits (secondary root number, root length and root dry weight) were statistically significant.The leaf area of the second and the second leaf were significantly and positively correlated with the grain yield, but the leaf area And the grain yield had no statistical significance.The flag leaf, the second leaf and the top two leaf chlorophyll SPAD value had significant or extremely significant positive correlation with the grain yield at the mature stage, the flag leaf and the second leaf chlorophyll SPAD The value of leaf area and the grain yield and grain yield were significantly or very significantly positive correlation.High altitude ecological zone developed secondary roots, top two leaves during late growth to maintain a relatively large leaf area and higher chlorophyll SP AD value of the coordination of wheat varieties (such as Yunmai 53) has a larger yield potential.