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Evaluating a conceptual model for drought tolerance

By: Contributor(s): Material type: TextPublication details: Mexico, DF (Mexico) CIMMYT : 2000ISBN:
  • 970-648-052-8
Subject(s): Summary: Wheat yields are reduced by 50-90% of their irrigated potential by drought on at least 60 million ha in the developing world. CIMMYT's wheat program is attempting to further improve drought tolerance by introgressing stress adaptive traits into empirically selected drought tolerant germplasm. Our current conceptual model for drought encompasses high expression of the following traits: seed size, coleoptile length, early ground cover, pre-anthesis biomass, stem reserves/remobilization, spike photosynthesis, stomatal conductance, osmotic adjustment, accumulation of abscisic acid (ABA), heat tolerance, leaf anatomical traits (waxiness, pubescence, rolling, thickness), high tiller survival, and stay-green.CIMMYT's germplasm collection is being screened for high expression of these traits. The traits will be tested systematically either in recombinant inbred lines, near isogenics, or synthetic hexaploids. Molecular markers will be developed for those traits showing genetic gains to selection.
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library CIMMYT Staff Publications Collection CIS-2516 (Browse shelf(Opens below)) 1 Available 649092
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Wheat yields are reduced by 50-90% of their irrigated potential by drought on at least 60 million ha in the developing world. CIMMYT's wheat program is attempting to further improve drought tolerance by introgressing stress adaptive traits into empirically selected drought tolerant germplasm. Our current conceptual model for drought encompasses high expression of the following traits: seed size, coleoptile length, early ground cover, pre-anthesis biomass, stem reserves/remobilization, spike photosynthesis, stomatal conductance, osmotic adjustment, accumulation of abscisic acid (ABA), heat tolerance, leaf anatomical traits (waxiness, pubescence, rolling, thickness), high tiller survival, and stay-green.CIMMYT's germplasm collection is being screened for high expression of these traits. The traits will be tested systematically either in recombinant inbred lines, near isogenics, or synthetic hexaploids. Molecular markers will be developed for those traits showing genetic gains to selection.

Global Wheat Program

English

R99-00CIMPU|0008|EE|3

INT1511

CIMMYT Staff Publications Collection

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