By K. S. Fischer, R. Lafitte, S. Fukai, G. Atlin, and B. Hardy
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Extra resources for Breeding rice for drought-prone environments
If the heritability of grain yield under stress is HY, the use of a secondary trait Z in selecting for grain yield under drought stress should be considered when √HY < rG√HZ. L A F I T T E E T A L • 37 BREEDING RICE FOR DROUGHT-PRONE ENVIRONMENTS 2. When to use secondary traits Secondary traits can improve selection response if they contribute in one of the following ways: ● Improve precision if the heritability of yield is reduced by stress and the heritability of the secondary trait is not reduced by stress.
If the timing and severity of drought in the screening environment are similar to L A F I T T E E T A L • 41 BREEDING RICE FOR DROUGHT-PRONE ENVIRONMENTS ● those of the target environment, leaf drying can be well correlated with yield under stress. To measure leaf desiccation, make a visual integration of the symptoms in a plot, based on total leaf area lost by desiccation (Photos 1 and 15). A common scoring system ranges from 0 (no senescence) to 5 (complete leaf drying). Just like for leaf rolling, it is most helpful for the final analysis if scoring is performed several times during the drought stress cycle.
For example, the timing of stress has a very large effect on how much yield is reduced, so it is hard to compare lines with different flowering dates. If a secondary trait is less sensitive to the growth stage of the crop, this makes it easier to compare lines of different maturity. ● Focus the selection on a specific type of drought, whereas yield is the summation of all stresses, including those not directly associated with water. ● Are cheaper and easier to measure than grain yield under stress.
Breeding rice for drought-prone environments by K. S. Fischer, R. Lafitte, S. Fukai, G. Atlin, and B. Hardy