Development of wheat lines carrying stripe rust resistance genes Yr10 and Yr15 in productive genetic backgrounds

Abstract

Stripe rust caused by Puccinia striiformis f. sp. tritici, is a major problem
of wheat production in many parts of the world and is an important
disease of wheat in North Western plains of India. One of the
resistance breeding options is based on major, marker tagged genes
with the ultimate objective of pyramided, complete and long lasting
resistance. Two such genes, Yr10 and Yr15, effective against stripe
rust races prevalent in India had been previously introgressed from
Avocet based stock into variety PBW 343 which served as a parent
for further crosses with variety PBW 621 (Also known as DPBW 621-
50). In the present study, BC1F5 derivatives of crosses PBW 621/4/
PBW 343//Yr10/6* Avocet/3/4*PBW 343/5/PBW 621 and PBW 621/4/
PBW 343//Yr15/6* Avocet/3/4*PBW 343/5/PBW 621 were screened
for presence of Yr10 and Yr 15 using closely linked markers E1 and
Xgwm 498 respectively. The gene positive lines were evaluated for
yield performance and stripe rust resistance over two years. A set of
important agronomic traits including yield components was recorded.
Two lines, namely BWL 3284 (carrying Yr10) and BWL 3287 (carrying
Yr15) showed yield advantage over best commercial check varieties
in both years and are deemed to constitute a suitable parental pair
for pyramiding of these two genes.