Fig. 5. Grain yield advantage of near-isogenic Hartog lines selected for low carbon isotope discrimination () compared with lines selected for high evaluated across nine environments differing in seasonal rainfall. Grain yield advantage (%) was estimated as: [(_{Low group} - _{High group})/_{High group}] x 100. Yield varied from around 1.5 Mg ha^-1 with 250 mm rainfall to 5 Mg ha^-1 with 450 mm rainfall.

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