Inheritance of Resistance to a New Strain of the Bacterial Blight Pathogen in Upland Cotton

Ted P. Wallace and K.M, El-Zik


 
ABSTRACT

Immunity to the bacterial blight pathogen in Upland cotton breeding lines and cultivars has been stable for more than 20 years. This immunity has been attributed to the combination of two or more major bacterial blight resistance genes and a modifier complex. In 1981, Follin, using the set of host differentials adopted by the Cotton Disease Council in 1980,discovered a new strain of Xanthomonas pv malvacearum (Smith) Dye in Upper Volta, Africa. This new strain, designated HVI, was capable of overcoming the immunity conferred by the B(2)B(3) gene combination. At the same time, HVI was reported by workers at the Bebedja Station in Chad. In 1984, a breeding line, designated S295, was identified in Chad that was resistant to the 18 U.S. races and the recently discovered HVI strain of X. c.pv malvacearum. The three parents of S295 were found to be resistant to the U.S. races but were susceptible to the HVI isolate. The objective of the present study was to investigate the mode of inheritance of resistance of S295 to the HVI isolate.



Reprinted from 1987 Proceedings: Beltwide Cotton Production Research Conferences pg. 557
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998