Campus Units

Agronomy

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

1-2013

Journal or Book Title

Euphytica

Volume

189

Issue

1

First Page

123

Last Page

133

DOI

10.1007/s10681-012-0759-0

Abstract

Genotypes with better root development have good nutrient acquisition capacity and may yield better under limited nitrogen (N) conditions and consequently can help reduce the N fertilization rate and hence mitigate some economic and ecological problems. This study focused on the genotypic variation among diverse maize inbred lines for seedling and adult plant traits under contrasting N levels. Seventy four lines were screened under high and low N levels in a climate chamber and in the field. High phenotypic diversity was observed for seedling and adult plant traits together with moderate to high broad-sense heritability estimates. Seedling total root length and root dry weight were significantly correlated with other root traits in maize. Of the adult plant traits evaluated in the field, the anthesis-silking interval and the leaf chlorophyll contents were significantly correlated with grain yield under both low and high N levels. In one location, the seminal root length was correlated with grain yield both under low and high N levels and the root dry weight was correlated with grain yield under high N. Selection indices based on secondary root traits along with grain yield could lead to an increase in selection efficiency for grain yield under N stress condition. By identifying lines with better root development, particularly lines with longer SRL, it may be possible to select inbred lines with higher grain yield particularly under low N condition.

Comments

This is a post-peer-review, pre-copyedit version of an article published in Euphytica. The final authenticated version is available online at: http://dx.doi.org/10.1007/s10681-012-0759-0. Posted with permission.

Copyright Owner

Springer Science+Business Media B.V.

Language

en

File Format

application/pdf

Published Version

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