• Wheat Pre-breeding Lines with Good Heat Tolerance

    These are pre-breeding lines derived from top-crosses using one germplasm bank accession crossed to an elite line, and then crossed to a second elite line. The accessions were selected as promising sources for use in breeding for heat tolerance, while CIMMYT wheat breeders recommended the elite lines as the best available lines. The pre-breeding lines were selected based on preliminary yield trials in 2015-16, and further identified based on field trials under heat stress and well-irrigated conditions in 2016-17 in Mexico. Additionally, mild selection was performed against yellow rust susceptibility and serious agronomic weaknesses.

    Product details and features

    1. List of pre-breeding lines with phenotypic data is available including checks, and elite lines as reference materials. Five pre-breeding lines had higher grain yield (5.9-12.3 %) than the best check varieties under heat stress. One pre-breeding line had significantly higher yield than checks Vorobey and Sokoll and was at par with check Baj#1. Under irrigated conditions, the same pre-breeding lines had significantly higher yield than Baj#1 and Sokoll and were at par with Vorobey.
    2. Genotypic data (available November 2017)
    3. Ability to sort by various traits, e.g. days to heading (DH), days to maturity (DM), Height (H), Yield (Y) (available November 2017)

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  • Comments

    These materials are suited for research or for large breeding programs interested in exploring exotic germplasm sources. These products can be used as heat tolerant bridging germplasm by interested researchers.


    Currently available. Seeds of these entries are available from CIMMYT’s germplasm bank. They can be requested as International wheat pre-breeding nursery-1 (IWPN-1)..

    Primary Users

    Wheat breeders for whom heat tolerance is a crucial priority trait; wheat breeders and geneticists investigating heat tolerance; researchers studying physiological mechanisms of heat tolerance; researchers engaged in gene discovery for heat tolerance.


    For more information

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