Inheritance of stem rust resistance in CHAM6/WW1402 spring wheat.

摘要

The wheat stem rust pathogen, Puccinia graminis f. sp. tritici Eriks. & E. Henn (Pgt) can potentially devastate wheat (Triticum aestivum L.) crops globally. Resistant wheat cultivars are an important component of minimizing crop damage caused by Pgt. A stem rust resistant plant selection of the spring wheat line CHAM-6/WW1402, developed at CIMMYT, is moderately resistant to Indiana isolates of Pgt. A population of recombinant inbred lines (RIL) from the cross of CHAM-6/WW1402 x 6HRWSN125 (susceptible) was developed and characterized for resistance to local isolates of Pgt in field tests in 2009 (F2:3) and in 2010 (F5:6) and in a greenhouse test (F6:7) at West Lafayette, Indiana, Purdue University facilities. Segregation for resistance in the RI population in the respective tests fit a one gene genetic model as determined by the Chi-square test for goodness of fit; and resistance is dominant. One hundred and six SSR markers that were polymorphic on the parent lines and resistant and susceptible bulks of, respectively, 8 RILs were identified, and used to map the stem rust resistance of CHAM-6/WW1402. The SSR marker, Wmc773 has been identified that co-segregates with the new stem rust resistance, and it can be used for marker-assisted selection for this resistance in wheat improvement.