甘蔗新品种粤糖04-252种性分析

Characteristics Analysis of New Sugarcane Variety Yuetang 04-252

以甘蔗新品种粤糖04-252为材料,分析了其蔗茎产量、含糖量和蔗糖分丰产性和稳产性,同时对其对其蔗茎产量及其构成因子之间进行了等级结构分析、相关分析、多元回归分析、通径分析和决定系数分析。丰产性和稳定性分析结果表明,粤糖04-252蔗茎产量、含糖量以及各期甘蔗蔗糖分均高于ROC22,稳产性能比ROC22好,受环境因素的影响较小,适应性较广。产量结构分析表明,公顷产蔗量在100～110 t之间的较合理群体结构为有效茎数在7.0～7.8万条/hm2、茎长在229.0～279.0 cm、茎径在2.55～2.95 cm。相关分析表明,蔗茎产量与产量构成因子茎径、茎长和有效茎数都呈极显著正相关关系。其中与有效茎数简单相关系数最高,与茎径偏相关系数最大。多元回归分析结果表明,蔗茎产量与其构成因子间存在着真实的线性关系。通径分析和决定系数分析表明,茎径对蔗茎产量的直接效应和直接决定系数最大,其次是有效茎数,茎长最小,三者对蔗茎产量的通径系数均达到极显著正相关,作用方式以直接效应为主。综上所述,粤糖04-252是一个有效茎数多、植株中高、中大茎至大茎的甘蔗新品种,根据其种性分析,茎径和有效茎数是决定粤糖04-252蔗茎产量的关键因子,同时要兼顾茎长。

Ability and stability of cane and sugar yield, sucrose content, population structure analysis, correlation analysis, multiple regres-sion analysis, path analysis and determination coefficient analysis were undertaken among yield and its components of the new variety Yuet-ang 04-252. The results of ability and stability analysis indicated that cane and sugar yield, sucrose content of Yuetang 0-04-252 were high-er than ROC 22, which was little impacted by environment, and better adaptability. Structural analysis of yield and its component factors showed that the optimum population structure of 100-110 t/hm^2 should have the millable stalk between 7.0 and 8.1 ten-thousand branches/ hm^2, stalk length between 229.0 and 279.0 ca, stalk diameter between 2.55 and 2.95 cm. Correlation among yield and its components re-vealed extremely significant correlation and the relationship between yield and stalk number and stalk diameter were most significant. There was linear relationship between yield and its components from the result of multiple regression analysis. Path coefficient analysis and determi- nation coefficient analysis in the case of yield components showed that, the stalk diameter was the most important character with the highest direct effect on cane yield relative to stalk length and stalk diameter. The difference of path coefficients of these traits reached extremely sig- nificant. In conclusion, Yuetang 04-252 was a new good sugarcane variety which had the desirable characteristics of more stalk number, me-dium height and medium to medium large stalk, so stalk diameter and number were the most traits to the yield taking account of stalk length.