Open AccessFour Near-Isogenic Lines of Cotton with Different Genes for Bacterial Blight Resistance
Author(s) -
Margaret Essenberg,
Melanie B. Bayles,
Roushan A. Samad,
Judy A Hall,
L. A. Brinkerhoff,
Laval M. Verhalen
Publication year - 2002
Publication title -
phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.264
H-Index - 131
eISSN - 1943-7684
pISSN - 0031-949X
DOI - 10.1094/phyto.2002.92.12.1323
Subject(s) - xanthomonas campestris , biology , gene , bacterial blight , gossypium , blight , genetics , gossypium hirsutum , xanthomonas , botany
The development and genetic characterization of four near-isogenic lines (NILs) of cotton (Gossypium hirsutum) is described herein. Each line contains a single, but different, gene for resistance to bacterial blight caused by Xanthomonas campestris pv. malvacearum. The lines were derived using at least six backcrosses to the susceptible recurrent parent ‘Acala 44’, followed by single plant-progeny row selection for uniformity. The NILs are homozygous for the B 2 , B 4 , B In , or b 7 genes and are designated as AcB 2 , AcB 4 , AcB In , and Acb 7 , respectively. In the ‘Acala 44’ background, B 2 , B 4 , and B In are partially dominant genes; b 7 is partially recessive. Relative strengths of resistance conferred by those genes toward race 1 of the pathogen were B 4 ˜b 7 >B In ˜B 2 . B 4 , B In , and b 7 each conferred resistance toward X. campestris pv. malvacearum carrying a single avirulence gene, whereas B 2 was less specific.