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Pathogenic and genetic diversity of Didymella rabiei affecting chickpea in Syria

机译:狂犬病迪米氏菌的致病性和遗传多样性影响叙利亚鹰嘴豆

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Simple sequence repeats and mating type markers were used to estimate the genetic diversity of 133 Didymella rabiei isolates collected from nine provinces of Syria. Moreover, phenotyping was done on 56 isolates randomly selected from the different genetic groups using five chickpea genotypes. The genetic diversity of D. rabiei population was high with inter-population variability accounting for 83% of the total variation, whereas the genetic diversity among populations was very low (17%). Principal component analysis grouped the isolates from Aleppo, Idlib, Hama, Horns and Hassakeh provinces together, while Daraa and Tartous were in different groups. Isolates from Lattakia and Suweida provinces formed very distinct clusters compared to the others. The 56 isolates were grouped into four pathotypes, namely, pathotype-1 (12 isolates), pathotype-2 (13 isolates), pathotype-3 (5 isolates) and pathotype-4 (26 isolates) with varying degrees of virulence on the chickpea genotypes. Our findings showed a clear genetic shift toward more virulence over time and space in the populations of D. rabiei in Syria. These results stress the need for chickpea breeding materials to be tested for resistance to the more virulent pathotypes. Also, concerted action should be taken to ensure the shipment of healthy seeds of international chickpea nurseries to avoid D. rabiei genotypes or pathotypes flow from Syria to other countries
机译:简单的序列重复和交配类型标记被用来估计从叙利亚的九个省收集的133个狂犬病杆菌的遗传多样性。此外,使用五种鹰嘴豆基因型,对从不同基因组中随机选择的56个分离株进行了表型分析。狂犬病种群的遗传多样性较高,种群间变异占总变异的83%,而种群间的遗传多样性却很低(17%)。主成分分析将来自阿勒颇,伊德利卜,哈马,霍恩斯和哈萨克省的分离株归为一类,而达拉和塔尔图斯则为不同的组。与其他省相比,来自拉塔基亚和苏威达省的分离株形成了非常不同的集群。将56个分离株分为4种病理型,即鹰嘴豆的毒力程度不同,分别为1型(12种),2型(13种),3型(5种)和4型(26种)。基因型。我们的研究结果表明,随着时间和空间的推移,叙利亚的D. rabiei人群的遗传向明显的致病性转移。这些结果强调需要对鹰嘴豆育种材料进行测试,以检测其对更具毒性的病原体的抵抗力。此外,应采取协调一致的行动,确保运送国际鹰嘴豆苗圃的健康种子,以防止D. rabiei基因型或病原体从叙利亚流向其他国家。

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