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Identification of wheat cultivars for low nitrogen tolerance using multivariable screening approaches

Tyagi, Bhudeva S.; Foulkes, John; Singh, Gyanendra; Sareen, Sindhu; Kumar, Pradeep; Broadley, Martin R.; Gupta, Vikas; Krishnappa, Gopalareddy; Ojha, Ashish; Khokhar, Jaswant S.; King, Ian P.; Singh, Gyanendra Pratap

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Authors

Bhudeva S. Tyagi

Gyanendra Singh

Sindhu Sareen

Pradeep Kumar

Vikas Gupta

Gopalareddy Krishnappa

Ashish Ojha

Jaswant S. Khokhar

Ian P. King

Gyanendra Pratap Singh



Abstract

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). A set of thirty-six wheat cultivars were grown for two consecutive years under low and high nitrogen conditions. The interactions of cultivars with different environmental factors were shown to be highly significant for most of the studied traits, suggesting the presence of wider genetic variability which may be utilized for the genetic improvement of desired trait(s). Three cultivars, i.e., RAJ 4037, DBW 39 and GW 322, were selected based on three selection indices, i.e., tolerance index (TOL), stress susceptibility index (SSI), and yield stability index (YSI), while two cultivars, HD 2967 and MACS 6478, were selected based on all four selection indices which were common in both of the study years. According to Kendall’s concordance coefficient, the consistency of geometric mean productivity (GMP) was found to be highest (0.778), followed by YSI (0.556), SSI (0.472), and TOL (0.200). Due to the high consistency of GMP followed by YSI and SSI, the three selection indices could be utilized as a selection tool in the identification of high-yielding genotypes under low nitrogen conditions. The GMP and YSI selection indices had a positive and significant correlation with grain yield, whereas TOL and SSI exhibited a significant but negative correlation with grain yield under both high and low nitrogen conditions in both years. The common tolerant genotypes identified through different selection indices could be utilized as potential donors in active breeding programs to incorporate the low nitrogen tolerant genes to develop high-yielding wheat varieties for low nitrogen conditions. The study also helps in understanding the physiological basis of tolerance in high-yielding wheat genotypes under low nitrogen conditions.

Citation

Tyagi, B. S., Foulkes, J., Singh, G., Sareen, S., Kumar, P., Broadley, M. R., …Singh, G. P. (2020). Identification of wheat cultivars for low nitrogen tolerance using multivariable screening approaches. Agronomy, 10(3), 1-17. https://doi.org/10.3390/agronomy10030417

Journal Article Type Article
Acceptance Date Mar 13, 2020
Online Publication Date Mar 19, 2020
Publication Date Mar 19, 2020
Deposit Date Jul 24, 2020
Publicly Available Date Jul 27, 2020
Journal Agronomy
Electronic ISSN 2073-4395
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 10
Issue 3
Article Number 417
Pages 1-17
DOI https://doi.org/10.3390/agronomy10030417
Public URL https://nottingham-repository.worktribe.com/output/4175698
Publisher URL https://www.mdpi.com/2073-4395/10/3/417

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