浙江农业学报 ›› 2026, Vol. 38 ›› Issue (2): 301-309.DOI: 10.3969/j.issn.1004-1524.20240999

• 植物保护 • 上一篇    下一篇

桑断枝烂叶病病原鉴定及47个桑树品种的抗性评价

陈泉1,2(), 栗辉1,2, 杨靖1,2, 徐嵩琳1,2, 张淑康1,2, 刘忠贤2,3,*(), 何锦辉3,*()   

  1. 1.重庆三峡农业科学院, 重庆 404155
    2.重庆三峡学院 生物与食品工程学院, 重庆 404100
    3.重庆市万州区经济作物发展中心, 重庆 404401
  • 收稿日期:2024-11-21 出版日期:2026-02-25 发布日期:2026-03-24
  • 作者简介:陈泉,主要从事植物病理和果树栽培研究。E-mail:chenquan0616@126.com
  • 通讯作者: *刘忠贤,E-mail:1058043435@qq.com
    何锦辉,E-mail:334634330@qq.com
  • 基金资助:
    重庆市教育委员会科学技术研究重点项目(KJ202301289858551);重庆市现代农业技术体系(蚕桑)创新团队专项(CQMAITS202511)

Identification of the pathogen causing mulberry snags rotten leaves disease and resistance of 47 mulberry varieties

CHEN Quan1,2(), LI Hui1,2, YANG Jing1,2, XU Songlin1,2, ZHANG Shukang1,2, LIU Zhongxian2,3,*(), HE Jinhui3,*()   

  1. 1. Chongqing Three Gorges Academy of Agricultural Sciences, Chongqing 404155, China
    2. College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing 404100, China
    3. Economic Crop Development Center in Wanzhou District of Chongqing City, Chongqing 404401, China
  • Received:2024-11-21 Online:2026-02-25 Published:2026-03-24

摘要:

为明确重庆黔江桑树产区普遍发生的叶片病害的病原,并评估不同桑树品种对桑断枝烂叶病的抗性水平,以建立精准高效的防控方法,减少桑叶损失,本研究开展了相关实验。通过田间采样,室内分离培养,PCR扩增ITS、ACT、TUB、TEF 4个基因片段并构建系统发育树,确定了病原菌种类;通过室内离体接种47个桑树品种叶片6 d后,根据发病率和病斑平均直径评价不同桑树品种的抗病性。从重庆黔江区桑叶上分离到菌株HBB1,被鉴定为桑断枝烂叶病病原菌(Boeremia exigua)的一个新变种,命名为Boeremia exigua var. mori。接种HBB1菌株后,川桑7657、湖桑32、农桑14号等21个品种的发病率达100%,川桑90-4发病率最低(53.84%)。病斑直径方面,川桑33、川桑39、川桑7657等6个品种的病斑直径大于12 mm,为高感品种;辐射1号病斑直径为2.09 mm,为高抗品种;抗病或中抗品种有32个。综上,本研究首次明确了重庆黔江桑断枝烂叶病的病原为新变种Boeremia exigua var. mori,并系统揭示了桑品种对该病原的抗性差异,可为抗病品种选育与病害精准防控提供科学依据。

关键词: 桑, 断枝烂叶病, 桑断枝烂叶病病原菌, 病原鉴定, 抗性测定

Abstract:

To identify the pathogen responsible for the prevalent leaf diseases in the mulberry production area of Qianjiang, Chongqing, and to evaluate the resistance levels of different mulberry varieties for establishing precise and efficient control methods to reduce mulberry leaf loss, this study was conducted. Through field sampling, indoor isolation and cultivation, PCR amplification of ITS, ACT, TUB, and TEF gene fragments, and construction of a phylogenetic tree, the pathogen was identified. The resistance of 47 mulberry varieties was evaluated by in vitro leaf inoculation and assessment of disease incidence and average diameter of disease spots after 6 days. The strain HBB1, isolated from mulberry leaves in Qianjiang District, Chongqing, was identified as a new variant of the mulberry snags rotten leaves disease (Boeremia exigua), named Boeremia exigua var. mori. After inoculation with HBB1, the incidence rate reached 100% for 21 varieties including Chuansang 7657, Husang 32, and Nongsang 14, while Chuansang 90-4 showed the lowest incidence rate (53.84%). Regarding disease spot diameter, 6 varieties including Chuan Sang 33, Chuan Sang 39, and Chuan Sang 7657 exhibited disease spot diameters greater than 12 mm, and were classified as highly susceptible varieties. In contrast, Fushe 1 showed a disease spot diameter of 2.09 mm, identifying it as a highly resistant variety. Additionally, 32 varieties demonstrated resistance or moderate resistance. In conclusion, this study is the first to confirm that the pathogen causing mulberry snags rotten leaves disease in Qianjiang, Chongqing, is the new variety Boeremia exigua var. mori. It systematically reveals the differences in resistance among mulberry varieties to this pathogen, providing a scientific basis for breeding resistant varieties and implementing precise disease control.

Key words: mulberry, snags rotten leaves disease, Boeremia exigua var. mori, pathogen identification, resistance evaluation

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