Thermographic imaging: assessment of drought and heat tolerance in Spanish germplasm of Brachypodium distachyon.

Benavente Barzana, M. Elena and Garcia Toledano, L. and Carrillo Becerril, Jose Maria and Quemada Saenz-Badillos, Miguel (2013). Thermographic imaging: assessment of drought and heat tolerance in Spanish germplasm of Brachypodium distachyon.. "Procedia Environmental Sciences", v. 19 ; pp. 262-266. ISSN 1878-0296. https://doi.org/10.1016/j.proenv.2013.06.030.

Description

Title: Thermographic imaging: assessment of drought and heat tolerance in Spanish germplasm of Brachypodium distachyon.
Author/s:
  • Benavente Barzana, M. Elena
  • Garcia Toledano, L.
  • Carrillo Becerril, Jose Maria
  • Quemada Saenz-Badillos, Miguel
Item Type: Article
Título de Revista/Publicación: Procedia Environmental Sciences
Date: 2013
ISSN: 1878-0296
Volume: 19
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Biotecnologia [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The annual grass Brachypodium distachyon has been recently recognized as the model plant for functional genomics of temperate grasses, including cereals of economic relevance like wheat and barley. Sixty-two lines of B. distachyon were assessed for response to drought stress and heat tolerance. All these lines, except the reference genotype BD21, derive from specimens collected in 32 distinct locations of the Iberian Peninsula, covering a wide range of geo- climatic conditions. Sixteen lines of Brachypodium hybridum, an allotetraploid closely related to B. distachyon were used as reference of abiotic-stress well-adapted genotypes. Drought tolerance was assessed in a green-house trial. At the rosette-stage, no irrigation was applied to treated plants whereas their replicates at the control were maintained well watered during all the experiment. Thermographic images of treated and control plants were taken after 2 and 3 weeks of drought treatment, when stressed plants showed medium and extreme wilting symptoms. The mean leaf temperature of stressed (LTs) and control (LTc) plants was estimated based upon thermographic records from selected pixels (183 per image) that strictly correspond to leaf tissue. The response to drought was based on the analysis of two parameters: LTs and the thermal difference (TD) between stressed and control plants (LTs – LTc). The response to heat stress was based on LTc. Comparison of the mean values of these parameters showed that: 1) Genotypes better adapted to drought (B. hybridum lines) presented a higher LTs and TD than B. distachyon lines. 2) Under high temperature conditions, watered plants of B. hybridum lines maintained lower LTc than those of B. distachyon. Those results suggest that in these species adaptation to drought is linked to a more efficient stomata regulation: under water stress stomata are closed, increasing foliar temperature but also water use efficiency by reducing transpiration. With high temperature and water availability the results are less definite, but still seems that opening stomata allow plants to increase transpiration and therefore to diminish foliar temperature.

More information

Item ID: 28927
DC Identifier: http://oa.upm.es/28927/
OAI Identifier: oai:oa.upm.es:28927
DOI: 10.1016/j.proenv.2013.06.030
Official URL: http://www.sciencedirect.com/science/article/pii/S1878029613003009
Deposited by: Memoria Investigacion
Deposited on: 25 Jun 2014 17:30
Last Modified: 22 Sep 2014 11:43
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