香蕉叶柄和假茎单宁含量与抗假茎象甲的相关性

Correlation Between Tannin Content in Petiole and Pseudostem of Banana and Its Resistance to Odoiporus longicollis(Oliver)

为了明确香蕉单宁含量与其对假茎象甲抗性的关系,采用香蕉假茎平均蛀道数比值法评价了6个香蕉品种对假茎象甲的抗性,用香草醛法测定了各品种香蕉叶柄和假茎的单宁含量并分析了单宁含量与其对假茎象甲抗性的关系。结果表明,广粉1号和海贡蕉对假茎象甲的抗性较强,南天皇和粤科1号抗虫性次之,宝岛蕉和巴西蕉抗虫性较差。香蕉叶柄和假茎单宁含量测定结果表明,香蕉各品种单宁含量差异较大,为7.21~16.60 mg/g,且香蕉假茎单宁含量高于叶柄。相关分析表明,香蕉假茎单宁含量与其对假茎象甲抗性呈显著负相关,而叶柄单宁含量与其对假茎象甲抗性无相关性。

To understand the relationship between the tannin content of banana and its resistance to pseudostem weevil,the resistance level of each banana cultivar to banana pseudostem weevil were evaluated by average ratio of borer hole number of larva of Odoiporus longicollis on six banana cultivars.The tannin content in banana petioles and pseudostems was determined by vanillin method,and the relationship between tannin content and insect resistance was analyzed.The results showed that Guangfen 1 and Haigongjiao had the strongest resistance to O.longicollis,followed by Nantianhuang and Yueke 1.Baodaojiao and Baxijiao showed the lowest resistance.The determination results of tannin content in banana petioles and pseudostems showed that the tannin content of banana cultivars varied from 7.21 mg/g to 16.60 mg/g,and the tannin content in pseudostem was higher than that in petiole.The correlation analysis showed that tannin content in pseudostem had a significantly negatively correlation with its resistance to O.longicollis,while the tannin content in petioles had no correlation with its resistance to O.longicollis.