甘蔗家系宿根性分析

Analysis of Ratooning Ability for Sugarcane Families

为分析甘蔗宿根性的遗传特点与亲本特性,实施了4组家系试验及1组分区家系试验,采用方差分析、相关分析、方差占比与遗传力等对甘蔗宿根性进行了评价分析。结果表明:甘蔗的宿根性受到家系、试验地点、重复甚至试验规模大小等多种因素的影响,试验地点、地点×家系互作对甘蔗性状宿根性影响最重要,其次是家系。家系方差和亲本加性方差占比与遗传力都相对较低,属低遗传力性状;蔗产量宿根性与新植性状表现不存在正相关;宿根性优良组合与优良亲本评价表明,国内及美国亲本杂交生产宿根性优良组合的频率没有明显差异;然而,不同类型亲本间宿根性表现存在区别,桂糖、粤糖和云南亲本的宿根表现优于其他类型亲本。在甘蔗育种进行宿根性评价与选择时,宜在选择适宜地点的基础上,在宿根季进行选择。

In order to analyze the genetic characteristics and parental characteristics of sugarcane ratooning ability, four family trials and one regional family trial were carried out. The ratooning ability of sugarcane was evaluated by variance analysis, correlation analysis, variance proportion and heritability. The ratooning ability of sugarcane could be affected by many factors, including sugarcane family, location, repetition and even the scale of trial. The location and interaction of location×family were most important for evaluation of sugarcane ratooning ability and followed by family. The proportion of family variance and parent additive variance and heritability were relatively low, belonging to low heritability traits. There was no positive correlation between ratooning ability and plant cane traits. The evaluation of excellent ratooning ability families and parents showed that there was no significant difference for the frequency of producing elite ratooning ability families among domestic parents and American parents. However, there were differences for ratooning ability among different type parents and the parents of Guitang, Yuetang and Yunnan was better than that of other types. For evaluation and selection of sugarcane ratooning ability, it is better to select in the ratoon crops with suitable location.