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为明确甘蔗叶冠形态与抗梢腐病相关性,在南宁市设置大田试验,以广西蔗区甘蔗梢腐病主要致病菌Fusarium verticillioides为毒源,对美国佛罗里达引进的13个甘蔗新品(系)和广西主栽品种ROC22进行接种研究。主成分分析法和相关性分析结果显示,甘蔗抗梢腐病性与其+1叶叶面积极显著正相关,与角度指数显著正相关。根据梢腐病病情指数抗性评价和聚类分析,14个参试甘蔗品种(系)被分成4类,即高抗品种CP07-2518、CP06-4647、CP06-3458和CP06-3332;抗病品种CP07-2547、CP07-1527、ROC22、CP06-3477和CP06-2897;中抗品种CP09-4707、CP09-4369和CP07-1533;中感品种CP06-3051和CP06-2422。结果表明,甘蔗叶冠形态与其抗梢腐病性存在一定相关性。株型紧凑、叶片狭窄直立且易脱叶的甘蔗品种对梢腐病抗性较强。反之,叶片宽大、披散下垂型且不容易脱叶的甘蔗品种对梢腐病抗性较差。
In order to clarify the correlation between leaf crown morphology and resistance to root rot in sugarcane, a field experiment was set up in Nanning City. Fusarium verticillioides, a major pathogen of sugarcane shoot rot in Guangxi sugarcane, was used as a source of toxicity to 13 new sugarcane varieties ) And Guangxi Cultivars ROC22 were inoculated. Principal component analysis and correlation analysis showed that there was a significant positive correlation between antitoxicity and leaf area of sugarcane, and significantly positive correlation with angle index. According to the resistance evaluation of disease index and clustering analysis, 14 tested sugarcane varieties (lines) were divided into 4 categories, that is, the resistant varieties CP07-2518, CP06-4647, CP06-3458 and CP06-3332; The varieties CP07-2547, CP07-1527, ROC22, CP06-3477 and CP06-2897; the resistant varieties CP09-4707, CP09-4369 and CP07-1533; the susceptible varieties CP06-3051 and CP06-2422. The results showed that there was a certain correlation between the morphology of sugarcane leaves and their resistance to shoot rot. Plant compact, leaf narrow and upright and easy to defoliate sugarcane varieties resistant to shoot rot. On the contrary, the sugarcane varieties with large leaves, loose and drooping and not easy to defoliate were less resistant to shoot rot.