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Open AccessArticle

Molecular Genetic Analysis of Drought Stress Response Traits in Brachypodium spp.

1
Department of Biomedicine and Biotechnology, University of Alcalá, 28805 Alcalá de Henares, Madrid, Spain
2
Institut National de la Recherche Agronomique de Tunis, Rue Hédi Karray 2049, Ariana, Tunisia
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(4), 518; https://doi.org/10.3390/agronomy10040518
Received: 27 February 2020 / Revised: 2 April 2020 / Accepted: 2 April 2020 / Published: 4 April 2020
The root is the organ responsible for the uptake of water and therefore has a very important role in drought tolerance. The aims of the present work were to characterize nine traits of the root system architecture (RSA) and the shoot dry weight (W) of twelve genotypes of Brachypodium spp. under water stress and to establish the relationship between RSA phenotyping traits and SSRs. Two culture media, one standard (SM) and one (PEG) to induced water stress have been used. In SM medium, B. stacei had the highest values of W and all the RSA traits, except the mean diameter of the seminal roots, followed by B. hybridum and B. distachyon. In the PEG medium, root length increased in B. distachyon, decreased in B. hybridum and remained the same in B. stacei. A two-way hierarchical cluster analysis from 117 polymorphic SSRs and the traits of the RSA of the Brachypodium spp. genotypes, was performed. Brachypodium genotypes were separated into three groups corresponding to each species. In the second way of the hierarchical clustering association were observed between five RSA variables and SSR markers, which could be useful in the search for genes or QTLs related to RSA characters. View Full-Text
Keywords: abiotic stress; distachyon; cereals; hybridum; molecular markers; root diversity; phenotyping; stacei abiotic stress; distachyon; cereals; hybridum; molecular markers; root diversity; phenotyping; stacei
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MDPI and ACS Style

González, J.M.; Redondo-Pedraza, J.; Loarce, Y.; Hammami, R.; Friero, E.; Jouve, N. Molecular Genetic Analysis of Drought Stress Response Traits in Brachypodium spp.. Agronomy 2020, 10, 518.

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