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本文对甜菊14个重要数量性状变异及不同密度对变异的影响进行了研究,结果表明同一性状变异趋势类同。稳定性状有移栽前叶对数、节数及收获时株高、节数和叶长;不稳定性状有分枝数、干、鲜茎及干、鲜叶产量。性状相关测定结果,与产量密切相关的性状有单株干叶重、鲜叶重、鲜茎重和干茎重,其次是茎粗和分枝数,再次是移栽前株高、节数和叶对数。各性状与产量多元回归结果,对产量贡献最大的是单株干叶重、鲜茎重及干茎重等。逐步回归结果,以单株干叶重对单位面积产量影响最大,y=0.442+8.89x,本文为甜菊高产栽培及育种提供了科学依据。
In this paper, the effects of 14 important quantitative traits of stevia and different densities on variation were studied. The results showed that the same traits of variation tended to be the same. Stability traits have logarithm of leaf number before transplanting, the number of sections and plant height, number of sections and leaf length at harvest; instability traits of branches, dry and fresh stems and dry and fresh leaf yield. Traits related to the determination of yield, traits closely related to the yield of dry leaves per plant weight, fresh leaf weight, fresh stem weight and dry stem weight, followed by the stem diameter and branch number, and again before transplanting plant height, number and Leaf logarithm. The results of multiple regression analysis of traits and yield showed that dry weight per plant, fresh stem weight and dry stem weight were the most important contributors to yield. Stepwise regression results showed that dry leaf weight per plant had the greatest effect on yield per unit area, y = 0.442 + 8.89x. This study provided a scientific basis for high-yielding and breeding of Chinese stevia.