Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Evolutionary pathways of Xoo to race 9a, 9b, 9c, and 9d are proposed based on the reaction phenotype (R, resistant; S, susceptible; MS, moderately susceptible) on rice lines with R genes Xa7 or Xa4, presence or absence of the XorI restriction modification system (32), genotype (haplotype) as determined by PCR assays (30, 31), and the presence or absence of a 4.2-kb BamHI fragment that corresponds to most of the coding region for avrXa7.
