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Maintaining green leaf area in grain sorghum increases nitrogen uptake under post-anthesis drought

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Borrell, A. K. and Douglas, A.C.L. (1997) Maintaining green leaf area in grain sorghum increases nitrogen uptake under post-anthesis drought. International Sorghum and Millets Newsletter, 38 . pp. 89-92. ISSN 1023-487X

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Article Link: https://www.cabidigitallibrary.org/doi/full/10.555...


To improve yield under water-limited conditions, Australian breeders have been selecting for the stay-green drought resistance trait. A study was conducted in Queensland during summer 1995 to determine whether more nitrogen will need to be applied to stay-green hybrids than to senescent hybrids if the yield advantage of stay-green types is to be realized under drought conditions. Nitrogen uptake was determined in 9 hybrids varying in rate of leaf senescence. Results showed that grain yield was highly correlated (r2 = 0.69) with above-ground nitrogen uptake at maturity. When water was limiting during grain filling, stay-green hybrids A35 × QL36 and AQL41 × QL12 extracted more nitrogen from the soil (∼280 kg N/ha) than senescent hybrids AQL41 × 69264 and AQL39 × QL36 (∼185 kg N/ha). Green leaf area at maturity explained over 70% of the variation in grain yield, and the relationship between nitrogen uptake and green leaf area at maturity was highly significant (r2 = 0.47). Differences in leaf and root uptake of nitrogen between stay-green and senescent genotypes are discussed. It is concluded that stay-green genotypes will require more nitrogen if they are to realize their yield potential under drought conditions.

Item Type:Article
Subjects:Science > Botany > Plant physiology
Plant culture > Field crops > Sorghum
Live Archive:22 Apr 2024 00:27
Last Modified:22 Apr 2024 00:27

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