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Modelling and genetic dissection of staygreen under heat stress

KEY MESSAGE: Staygreen traits are associated with heat tolerance in bread wheat. QTL for staygreen and related traits were identified across the genome co-located with agronomic and physiological traits associated to plant performance under heat stress. ABSTRACT: Plant chlorophyll retention—staygree...

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Autores principales: Pinto, R. Suzuky, Lopes, Marta S., Collins, Nicholas C., Reynolds, Matthew P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5069319/
https://www.ncbi.nlm.nih.gov/pubmed/27545985
http://dx.doi.org/10.1007/s00122-016-2757-4
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author Pinto, R. Suzuky
Lopes, Marta S.
Collins, Nicholas C.
Reynolds, Matthew P.
author_facet Pinto, R. Suzuky
Lopes, Marta S.
Collins, Nicholas C.
Reynolds, Matthew P.
author_sort Pinto, R. Suzuky
collection PubMed
description KEY MESSAGE: Staygreen traits are associated with heat tolerance in bread wheat. QTL for staygreen and related traits were identified across the genome co-located with agronomic and physiological traits associated to plant performance under heat stress. ABSTRACT: Plant chlorophyll retention—staygreen—is considered a valuable trait under heat stress. Five experiments with the Seri/Babax wheat mapping population were sown in Mexico under hot-irrigated environments. Normalized difference vegetation index (NDVI) during plant growth was measured regularly and modelled to capture the dynamics of plant greenness decay, including staygreen (Stg) at physiological maturity which was estimated by regression of NDVI during grainfilling. The rate of senescence, the percentage of plant greenness decay, and the area under the curve were also estimated based on NDVI measurements. While Stg and the best fitted curve were highly environment dependent, both traits showed strong (positive for Stg) correlations with yield, grainfilling rates, and extended grainfilling periods, while associations with kernel number and kernel weight were weak. Stg expression was largely dependent on rate of senescence which was related to the pattern of the greenness decay curve and the initial NDVI. QTL analyses revealed a total of 44 loci across environments linked to Stg and related traits, distributed across the genome, with the strongest and most repeatable effects detected on chromosomes 1B, 2A, 2B, 4A, 4B and 7D. Of these, some were common with regions controlling phenology but independent regions were also identified. The co-location of QTL for Stg and performance traits in this study confirms that the staygreen phenotype is a useful trait for productivity enhancement in hot-irrigated environments. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00122-016-2757-4) contains supplementary material, which is available to authorized users.
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spelling pubmed-50693192016-11-02 Modelling and genetic dissection of staygreen under heat stress Pinto, R. Suzuky Lopes, Marta S. Collins, Nicholas C. Reynolds, Matthew P. Theor Appl Genet Original Article KEY MESSAGE: Staygreen traits are associated with heat tolerance in bread wheat. QTL for staygreen and related traits were identified across the genome co-located with agronomic and physiological traits associated to plant performance under heat stress. ABSTRACT: Plant chlorophyll retention—staygreen—is considered a valuable trait under heat stress. Five experiments with the Seri/Babax wheat mapping population were sown in Mexico under hot-irrigated environments. Normalized difference vegetation index (NDVI) during plant growth was measured regularly and modelled to capture the dynamics of plant greenness decay, including staygreen (Stg) at physiological maturity which was estimated by regression of NDVI during grainfilling. The rate of senescence, the percentage of plant greenness decay, and the area under the curve were also estimated based on NDVI measurements. While Stg and the best fitted curve were highly environment dependent, both traits showed strong (positive for Stg) correlations with yield, grainfilling rates, and extended grainfilling periods, while associations with kernel number and kernel weight were weak. Stg expression was largely dependent on rate of senescence which was related to the pattern of the greenness decay curve and the initial NDVI. QTL analyses revealed a total of 44 loci across environments linked to Stg and related traits, distributed across the genome, with the strongest and most repeatable effects detected on chromosomes 1B, 2A, 2B, 4A, 4B and 7D. Of these, some were common with regions controlling phenology but independent regions were also identified. The co-location of QTL for Stg and performance traits in this study confirms that the staygreen phenotype is a useful trait for productivity enhancement in hot-irrigated environments. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00122-016-2757-4) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2016-08-22 2016 /pmc/articles/PMC5069319/ /pubmed/27545985 http://dx.doi.org/10.1007/s00122-016-2757-4 Text en © The Author(s) 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Original Article
Pinto, R. Suzuky
Lopes, Marta S.
Collins, Nicholas C.
Reynolds, Matthew P.
Modelling and genetic dissection of staygreen under heat stress
title Modelling and genetic dissection of staygreen under heat stress
title_full Modelling and genetic dissection of staygreen under heat stress
title_fullStr Modelling and genetic dissection of staygreen under heat stress
title_full_unstemmed Modelling and genetic dissection of staygreen under heat stress
title_short Modelling and genetic dissection of staygreen under heat stress
title_sort modelling and genetic dissection of staygreen under heat stress
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5069319/
https://www.ncbi.nlm.nih.gov/pubmed/27545985
http://dx.doi.org/10.1007/s00122-016-2757-4
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