Low nitrogen tolerance in tropical quality protein maize ( Zea mays L.): value of predictive traits

Monneveux, P. and Cabon, G. and Sánchez, C. (2006) Low nitrogen tolerance in tropical quality protein maize ( Zea mays L.): value of predictive traits. Cereal Research Communications, 34 (4). pp. 1239-1246. ISSN 0133-3720

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Abstract

In the tropics, maize ( Zea mays L.) is often grown under low N conditions. Information on the respective role of N uptake and partitioning at anthesis in determining grain yield under low N is scarce. Senescence traits have been proposed as secondary traits to select for low N tolerance, but the stability of their association with yield under different environmental conditions has been rarely described. In the present study we analyzed the associations between grain yield, N uptake and partitioning at anthesis, dry matter matter partitioning, and senescence traits during two seaons in QPM (quality protein maize) hybrids. Association between grain yield and N uptake at anthesis, when found, was mainly explained by a close relationship between grain yield and above-ground biomass. No relationship was found between grain yield and N partitioning at anthesis. In both seasons grain yield was significantly positively associated with ear to above-ground biomass and ear to tassel weight ratios. The magnitude of the correlation between grain yield and senescence traits highly depended on climatic conditions.

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