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对各种类型的小麦品种、小麦属的其他种及其近缘植物以及其他的禾谷类作物的株高及其节间长度经广泛调查合作了分析,分析结果表明,这一类植物上下节间长度是有一定比例的,作者称这种比例关系为株高构成指数。设株高构成指数(Ⅰ)为任一节间长度与该节间加其下一节间长度之和的比值,则现代小麦品种类型的Ⅰ值趋近于“黄金分割”比值——0.618,而野生禾本科植物的Ⅰ值低于此值。这很可能是对产量性状进行人工选择后的间接效应。较高的Ⅰ值是抗倒伏和合理利用光源的标志.对普通小麦81个品种材料所作的遗传分析表明这一性状的遗传力较高,性状稳定,与产量有着极显著正相关,而且品种间差异显著.从而推论,以现代栽培小麦的平均Ⅰ值为基准,对高于0.618的Ⅰ值进行选择,将有助于产量潜力的提高。作者提出下列经验公式描述现代小麦品种的标准株高结构型,并以此作为选择的尺度.Ln=L·0.618~((n+1))L=株高;Ln=第 n 节间长度n=由上而下的节位根据上式,测得株高,便可推得任何一节间长度之理论值.以1981和1982两年的资料计算得到之理论值经 t 测验证明完全符合实测情况。
The investigation of plant height and internode length for various types of wheat cultivars, other species of Triticum and related plants, and other cereal crops has been carried out in cooperation with a wide range of surveys. The results show that the up and down internodes Length is a certain percentage, the author said that the relationship between the composition of plant height index. If the composition index of plant height (Ⅰ) is the ratio of the length of any internode to the sum of its internode and its next internode, the value Ⅰ of modern wheat varieties approaches the ratio of “golden section” -0.618, The value of the wild gramineous plant I is lower than this value. This is likely to be an indirect effect after manual selection of yield traits. The higher value of Ⅰ is the symbol of lodging and rational use of light sources.Genetic analysis of 81 varieties of common wheat showed that the trait of heritability was high and the characters were stable with a very significant and positive correlation with the yield, The difference was significant.Accordingly, based on the average Ⅰ value of modern cultivated wheat, the value of Ⅰ higher than 0.618 was selected, which would contribute to the increase of yield potential. The authors propose the following empirical formula to describe the standard plant height structure of modern wheat cultivars and use it as a measure of selection: Ln = L · 0.618 ~ ((n + 1)) L = plant height; Ln = = Top-down knots according to the above formula, measured the plant height, you can deduce the theoretical value of any length of an interval calculated in 1981 and 1982 two years of theoretical data obtained by the t test proved fully consistent with the measured Happening.