Combining resistance to leaf rust and terminal heat tolerance in wheat for the Eastern Gangetic Plains of India.
Tiwari, C.
Combining resistance to leaf rust and terminal heat tolerance in wheat for the Eastern Gangetic Plains of India. - 2012 - p. 203
Abstract only
Leaf rust is an important wheat disease in South Asia where terminal heat stress is also a major problem. These two stresses, if overcome through enhanced resistance/tolerance, will help to ensure food security in the region. A Berkut/Krichauff doubled haploid (DH) population of 140 lines (including parents) was evaluated under heat stress conditions at Banaras Hindu University, Varanasi (25.18N, 83.03E, 123.93 m ASL) during 2007-2010. The field trial was conducted in three replications with plot sizes of 4.5 m2/line. Screening for leaf rust response was conducted separately under artificial epiphytotic conditions. Berkut is moderately heat tolerant and possesses APR to leaf rust whereas Krichauff has higher heat tolerance with moderate resistance to leaf rust. Significant variation was observed among DH lines for grain yield and canopy temperature (CT) under heat stress. The performance of seven lines was significantly superior to the parents for CT and 10 lines were superior in grain yield. Composite interval mapping detected two QTLs each for yield (QLY.bhu-7D, QLY.bhu-2A) and CT (QLCt.bhu-2B, QLsCt.bhu-7D). More than half (88) of the DH lines displayed significantly higher resistance than the parents. Five heat tolerant lines were resistant to leaf rust. These results demonstrate that heat tolerance and leaf rust resistance can be combined in DH lines. The tolerant lines are under further evaluation for use in crossing programs and for promotion to national trials.
English
978-0-615-70429-6
Combining resistance to leaf rust and terminal heat tolerance in wheat for the Eastern Gangetic Plains of India. - 2012 - p. 203
Abstract only
Leaf rust is an important wheat disease in South Asia where terminal heat stress is also a major problem. These two stresses, if overcome through enhanced resistance/tolerance, will help to ensure food security in the region. A Berkut/Krichauff doubled haploid (DH) population of 140 lines (including parents) was evaluated under heat stress conditions at Banaras Hindu University, Varanasi (25.18N, 83.03E, 123.93 m ASL) during 2007-2010. The field trial was conducted in three replications with plot sizes of 4.5 m2/line. Screening for leaf rust response was conducted separately under artificial epiphytotic conditions. Berkut is moderately heat tolerant and possesses APR to leaf rust whereas Krichauff has higher heat tolerance with moderate resistance to leaf rust. Significant variation was observed among DH lines for grain yield and canopy temperature (CT) under heat stress. The performance of seven lines was significantly superior to the parents for CT and 10 lines were superior in grain yield. Composite interval mapping detected two QTLs each for yield (QLY.bhu-7D, QLY.bhu-2A) and CT (QLCt.bhu-2B, QLsCt.bhu-7D). More than half (88) of the DH lines displayed significantly higher resistance than the parents. Five heat tolerant lines were resistant to leaf rust. These results demonstrate that heat tolerance and leaf rust resistance can be combined in DH lines. The tolerant lines are under further evaluation for use in crossing programs and for promotion to national trials.
English
978-0-615-70429-6