Abstract only

Pgt race Ug 99 (TTKSK) was first detected in southwest Iran in 2007 and subsequently in southern parts of the country in 2009 and 2010. Since the first detection, breeding for resistance was adopted as the first priority of the national wheat breeding program. The objective of the present study was to evaluate seedling and adult-plant resistance of the current wheat germplasm to Ug99. Seedling assessments were made at SPII using TTKSK, and adult-plant tests were conducted at Njoro, Kenya, with race raceUg99 + Sr24 virulent (TTKST). Fifteen (11.5%) of 130 winter wheat genotypes were resistant in Kenya and clearly had pseudo-black chaff indicative of Sr2. Among the 15 genotypes, seven exhibited low seedling responses to TTKSK. Among 49 spring genotypes, 116 (33.2%) were resistant to TTKST in Njoro; 62 of these displayed low seedling infection types against TTKSK. Overall 27.3% of genotypes had APR. Among the field resistant spring genotypes, 11 showed PBC. There has been significant recent progress in development of resistance to race Ug99 in the Iranian breeding germplasm. Further study is required to genetically characterise the seedling and adult-plant resistances of genotypes resistant to the Sr31-virulent races.

Global Wheat Program

English

Lucia Segura

INT3505

CIMMYT Staff Publications Collection