PJB-2010-163
SCREENING OF LOCAL WHEAT VARIETIES AGAINST BACTERIAL LEAF STREAK CAUSED BY DIFFERENT STRAINS OF XANTHOMONAS TRANSLUCENS PV. UNDULOSA (XTU)
NAVEED IQBAL RAJA1, HAMID RASHID2*, M. HAROON KHAN2, ZUBEDA CHAUDHRY3, MUQARRAB SHAH, AND ASGHARI BANO1
Abstract
Wheat is one of the most important food crops of Pakistan, but its yield is adversely affected due to bacterial leaf streak disease caused by Xanthomonas translucens pv. undulosa (Xtu) resulting in 20% decrease in yield. During present investigation 6 wheat varieties including Chakwal-97, Inqulab-91, GA-2002, Aquab-2002, Punjnand-2000 and Tartara-2000 were screened against 10 different strains of Xanthomonas translucens pv. undulosa (Xtu) at various stages of plant growth to check virulence against bacterial leaf streak. Wheat nursery was grown in glass house and pathogenicity of each strain/isolate was tested at seedling stage (4 weeks olds) and at tillering stage (8 week-old) wheat plants by using clipping method of artificial inoculation. The symptom development was rated by counting water-soaked lesion, number, size and progress of necrosis on leaves and the resistance of particular variety against particular strain was determined. It was evident from the results that all the six wheat varieties were susceptible to Xanthomonas translucens pv. undulosa (Xtu) but Aquab-2002 was highly susceptible to all the exotic/local strains/isolates of Xanthomonas translucens pv. undulosa (Xtu) with an average maximum percentage (69%) of disease incidence and Inqulab-91 was least virulent (10%). The highest percentage (83%) of disease incidence was for Xanthomonas strain UPB-513 at the seedling stage of Aquab-2002. The disease incidence of all the 6 wheat varieties was less at maximum tillering stage (52%) as compared to that of seedling stage (83%) for Aquab-2002 as well as all other varieties. Reactions of bacterial strains were variable (10-83%) to different wheat varieties and the response of bacterial strains/isolates was also found variable (0-72%) within the same wheat varieties.
To Cite this article:
Download
