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Investigating the presence and interaction of durable rust resistance genes through molecular markers in three bread wheat populations

By: Contributor(s): Material type: TextTextPublication details: 2012Description: p. 130ISBN:
  • 978-0-615-70429-6
Summary: Leaf rust, stripe (yellow) rust and stem rust are important constraints to wheat production worldwide. Durable resistance to the rusts can be achieved by developing and deploying varieties that have race-nonspecific, APR conferred by multiple minor, slow rusting resistance genes. Weebill#1*2/Brambling, released as Villa Juarez F2009 in Mexico, is a high yielding CIMMYT line with APR to the three rusts. The objective of our study was to investigate the presence and interaction of durable resistance genes Lr34/Yr18/Sr57, Lr46/Yr29, Lr67/Yr46/Sr55, Sr2/Yr30 and Lr68 by using linked molecular markers in three recombinant inbred line populations. The Jupateco 73S × Weebill#1 and Jupateco 73S × Brambling populations were evaluated previously for leaf rust response at two sites, whereas the Avocet × Weebill#1*2/Brambling population was evaluated for both leaf rust and yellow rust response in Mexico. Lr46/Yr29 and Lr68 identified in the Jupateco 73S × Weebill#1 population had a mean leaf rust severity reduction of 49-59% when both genes were combined. The combined effect of Lr34/Yr18 and Lr46/Yr29, identified in Jupateco 73S × Brambling, led to a mean leaf rust severity reduction of 90-91%. Combinations of Lr46/Yr29, Lr68 and Sr2/Yr30 in the Avocet × Weebill#1*2/ Brambling population had enhanced resistance to both diseases with mean leaf rust and yellow rust severity reductions of 49-54 and 25-28%, respectively. The resistant parents of these populations can be used in breeding programs to improve the level of durable rust resistance.
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library CIMMYT Staff Publications Collection CIS-6943 (Browse shelf(Opens below)) Available
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Abstract only

Leaf rust, stripe (yellow) rust and stem rust are important constraints to wheat production worldwide. Durable resistance to the rusts can be achieved by developing and deploying varieties that have race-nonspecific, APR conferred by multiple minor, slow rusting resistance genes. Weebill#1*2/Brambling, released as Villa Juarez F2009 in Mexico, is a high yielding CIMMYT line with APR to the three rusts. The objective of our study was to investigate the presence and interaction of durable resistance genes Lr34/Yr18/Sr57, Lr46/Yr29, Lr67/Yr46/Sr55, Sr2/Yr30 and Lr68 by using linked molecular markers in three recombinant inbred line populations. The Jupateco 73S × Weebill#1 and Jupateco 73S × Brambling populations were evaluated previously for leaf rust response at two sites, whereas the Avocet × Weebill#1*2/Brambling population was evaluated for both leaf rust and yellow rust response in Mexico. Lr46/Yr29 and Lr68 identified in the Jupateco 73S × Weebill#1 population had a mean leaf rust severity reduction of 49-59% when both genes were combined. The combined effect of Lr34/Yr18 and Lr46/Yr29, identified in Jupateco 73S × Brambling, led to a mean leaf rust severity reduction of 90-91%. Combinations of Lr46/Yr29, Lr68 and Sr2/Yr30 in the Avocet × Weebill#1*2/ Brambling population had enhanced resistance to both diseases with mean leaf rust and yellow rust severity reductions of 49-54 and 25-28%, respectively. The resistant parents of these populations can be used in breeding programs to improve the level of durable rust resistance.

Global Wheat Program

English

Lucia Segura

INT2833

CIMMYT Staff Publications Collection

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