Campus Units

Agronomy

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

5-2015

Journal or Book Title

Plant Molecular Biology

Volume

88

Issue

1-2

First Page

133

Last Page

147

DOI

10.1007/s11103-015-0314-1

Abstract

Genotypes with large and well distributed root system might have the potential to adapt to soils with limited nutrient availability. For this purpose, an association study (AS) panel consisting of 74 diverse set of inbred maize lines were screened for seedling root traits and adult plant root traits under two contrasting nitrogen (N) levels (low and high N). Allele re-sequencing of RTCL, RTH3, RUM1, and RUL1 genes related to root development was carried out for AS panel lines. Association analysis was carried out between individual polymorphisms, and both seedling and adult plant traits, while controlling for spurious associations due to population structure and kinship relations. Based on the SNPs identified in RTCL, RTH3, RUM1, and RUL1, lines within the AS panel were grouped into 16, 9, 22, and 7 haplotypes, respectively. Association analysis revealed several polymorphisms within root genes putatively associated with the variability in seedling root and adult plant traits development under contrasting N levels. The highest number of significantly associated SNPs with seedling root traits were found in RTCL (19 SNPs) followed by RUM1 (4 SNPs) and in case of RTH3 and RUL1, two and three SNPs, respectively, were significantly associated with root traits. RTCL and RTH3 were also found to be associated with grain yield. Thus considerable allelic diversity is present within the candidate genes studied and can be utilized to develop functional markers that allow identification of maize lines with improved root architecture and yield under N stress conditions.

Comments

This is a post-peer-review, pre-copyedit version of an article published in Plant Molecular Biology. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11103-015-0314-1.

Copyright Owner

Springer Science+Business Media Dordrecht

Language

en

File Format

application/pdf

Published Version

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