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在樱桃的病虫害中,唯根癌病为害最重,轻者造成减产,降低果实品质,重者整株死亡。烟台市芝罘区南里村果园,88亩结果大树因根癌病严重,全部刨除,造成年经济损失80多万元。 根癌病是由根癌土壤杆菌(Agrobacteriumfumefaciens)侵染引起的。根癌土壤杆菌的致瘤能力是由其Ti质粒决定的。致瘤基因都集中在Ti质粒的T—DNA区内,病原菌侵入植物时,T—DNA转移到植物细胞并与染色体DNA整合,T—DNA上编码的生长素和细胞分裂素生物合成基因(tms和tmr基因)的表达,使细胞分
In the cherry pests and diseases, the only root cause of cancer damage, the light caused by reduced production, reducing fruit quality, severe case of whole plant death. Yantai Zhili District Nanli orchards, 88 acres of results large tree due to cancer serious, all excised, resulting in annual economic losses of 800000 yuan. Root cancer is caused by Agrobacterium fumefaciens infection. Tumorigenicity of Agrobacterium tumefaciens is determined by its Ti plasmid. Tumorigenic genes are concentrated in the T-DNA region of the Ti plasmid. When pathogenic bacteria invade plants, the T-DNA is transferred to plant cells and is integrated with the chromosomal DNA. The auxin and cytokinin biosynthetic genes (tms And tmr gene), so that the cells were divided