Characterization of Congolese Strains of <i>Xanthomonas axonopodis</i>pv. <i>manihotis</i>Associated with Cassava Bacterial Blight

• 作者: A. Kalonji-Mbuyi G. Mamba-Mbayi K. K. Nkongolo P. Tshilenge-Djim
• 来源期刊: 美国植物学期刊(英文)
• 学科: 医学
• 关键词: CASSAVA Bacterial Blight (CBB) Xanthomonas axonopodis pv. manihotis Morphological and Physiological Characters CBB Incidence STRAINS Aggressiveness DR-Congo
• 年，卷（期）: 2014,（9）
• 页码范围: 1191-1201
• 页数: 11页
• 分类号: R73

摘要

Cassava bacterial blight (CBB) caused by Xanthomonas axonopodis pv. manihotis has been reported in several African countries since 1970. Knowledge of the virulence and diversity of Xanthomonas axonopodis pv. manihotis strains is important for an integrated control of CBB. The main objective of the present study was to characterize strains of Xanthomonas axonopodis collected from various regions in the DR-Congo. There was variability among strains for shape (form), contour (margin) and elevation. Bacterial cell size for the strains analyzed varied from 24.1 μm × 11.3 μm to 11.4 μm × 4.2 μm. All the Xanthomonas axonopodis pv. manihotis strains but one was motile. Two distinctive groups were identified based on radial growth of their colonies. The first group grows faster (7.8-10.5 mm/d) compared to the second group (4.8-6.9 mm/d). Five strains (Gandajika, Inera/Stat, Kansasa, Mulumba and Musakatshi) were classified as virulent with a damage rating ≤ 1 and four were aggressive (Luputa, M'vuazi, Boketa and Kiyaka) with a damage rating > 1. Significant differences were also observed among strains for disease onset, incidence and plant mortality. The highest incidence (33%) of bacterial blight 21 days after infestation (DAI) resulted from the Boketa strain inoculation and the lowest (0 % disease incidence) from INERA/STAT and Musakatshi strains. There was no clear association between geographic origin of the strains and their aggressiveness.