Abstract only

Wheat is the main staple food crop in Tajikistan and it is of high importance to have an in-country breeding program in collaboration with International Centers. In particular yellow rust has become a serious wheat disease, and significantly reduced grain yield by 30-50% in Tajikistan in 2010. The breeding activities carried out by the national wheat breeding program in 2009 and 2010 has resulted in a number of high yielding and yellow rust resistant facultative/winter and spring bread wheat lines being identified through multi-location yield trials. The following lines were promoted for official variety testing; PRINIA/STAR, SHARK/F4105W2.1, OTUS/ TOBA97, HUAYUNINIA, KAUZ*2/CHEN//BCN/3/MILAN, CBRD/KAUZ and CMH82A.1294/2*KAUZ//MUNIA/ CHTO/3/MILAN. The stem rust race Ug99 has spread across a number of African countries and have now established itself in the Middle East, and might migrate further. For this reason 100 widely grown bread wheat varieties and advanced breeding lines were evaluated for adult plant resistance against Ug99 at Njoro, Kenya. The results showed that 85% of the genotypes were susceptible with reactions ranging from 40S to 70S and 10% were found moderately susceptible ranging from 20MS to 50MS. Only 5% of the genotypes were found moderately resistant ranging from 10MR to 40MR to Ug99. Also, a number of BC1F3 wheat-rye translocation lines (1RS++ and 2RL-+) were evaluated for resistance towards Ug99 in Njoro, Kenya. Two lines showed APR to Ug99. The two resistant lines will be utilized in combination with Tajik germplasm to develop a mapping population for determining the underlying basis of resistance.

Global Wheat Program

English

Lucia Segura

INT1787