NOTE - The difference between breeding for nutrient use efficiency and for nutrient stress tolerance

Abstract

This study aimed to verify the relationship between breeding for tolerance to low levels of soil nutrients and fornutrient use efficiency in tropical maize. Fifteen inbred lines were evaluated in two greenhouse experiments under contrasting levelsof N and P. The relationship between nutritional efficiency and tolerance to nutritional stress was estimated by the Spearman rankingcorrelation between the genotypes for the traits related to N and P use efficiency and phenotypic plasticity indices. The lack ofrelationship between the traits, in magnitude as well as significance, indicates that these characters are controlled by different genegroups. Consequently, simultaneous selection for both nutrient use efficiency and tolerance to nutritional stress is possible, if themechanisms that confer efficiency and tolerance are not competitive.

Keywords

• plant breeding
• abiotic stress
• Zea mays L.