Dry root rot (DRR), caused by Macrophomina phaseolina, is a prevalent disease of mungbean in Myanmar, and an emerging problem in South Asia. The pathogen is a polyphagous necrotroph, survives in the soil for many years that results disease mitigation difficult. Managing DRR in mungbean through an integrated approach has been suggested, and the use of resistant varieties is one of the economical methods. The present study aimed to identify sources of resistance against DRR from a mungbean mini-core collection and to characterize the associated M. phaseolina isolates from India and Myanmar. Evaluation of the 296 mungbean mini-core accessions against the isolate MP1 by paper towel method identified 29 accessions with DRR resistance (disease scores: ≤ 3), and 18 of them with the consistent resistance in the repeated experiment. During the screening of 18 resistant accessions in the glasshouse, nine accessions were found DRR resistance in repeated sick pot experiments with ≤10% disease incidence. A subset of 30 accessions was selected from the mini-core collection based on their in vitro DRR reactions. These accessions were evaluated for DRR resistance in the field in Yezin, Myanmar in 2018 and 2019. Out of the 30 accessions, ten accessions were found DRR resistance with ≤10% disease incidence in both years of evaluations. Pooled analysis of percent disease incidence data of 15 accessions common in both glasshouse and field revealed the stability of accessions VI001509AG, VI001244AG, and VI001400AG for DRR resistance across years and locations. The three resistant accessions along with a susceptible check VC693088 were re-evaluated by paper towel method against nine additional M. phaseolina isolates from India (MP3-MP11). The accessions VI001509AG and VI001400AG were resistant to all nine isolates, while accession VI001244AG was resistant to MP5, MP6, and MP7 isolates. These accessions could be used in mungbean DRR resistance breeding programs.

由菜豆（Macrophomina phaseolina）引起的干根腐烂症（DRR）是缅甸的一种绿豆病，在南亚是一个新出现的问题。病原体是多食性坏死菌，在土壤中存活了许多年，导致缓解疾病的难度加大。已经提出了通过综合方法来管理绿豆中的DRR的方法，而使用抗性品种是一种经济的方法。本研究旨在从绿豆微型核心菌种中鉴定抗DRR的来源，并鉴定相关的菜豆分枝杆菌与印度和缅甸分离。用纸巾法评估了296个绿豆微型核心抗分离株MP1，鉴定出29个具有DRR抗药性的病种（疾病评分：≤3），其中18个在重复实验中具有一致的抗性。在温室中筛选18种抗药性材料时，在重复的病盆实验中发现9种抗药性DRR抗性，发病率≤10％。从微型核心收集物中选择了30个入藏子集，基于它们的体外DRR反应。在2018年和2019年对这些品系在缅甸叶津的田间进行了DRR抗药性评估。在这两年的评估中，在30个品系中，发现10个品系具有DRR抗药性，疾病发生率≤10％。温室和田间常见的15种种质的发病率数据的汇总分析显示，种质VI001509AG，VI001244AG和VI001400AG的抗DRR能力在多年和不同地点均很稳定。通过纸巾方法对另外9种菜豆分枝杆菌重新评估了3种抗性种质和易感性检查VC693088来自印度的分离株（MP3-MP11）。登录号VI001509AG和VI001400AG对所有9种分离株都有抗性，而登录号VI001244AG对MP5，MP6和MP7分离株具有抗性。这些种质可用于绿豆DRR抗性育种计划。