Ecophysiology and genetics of drought tolerance in Populus
Ecophysiology and genetics of drought tolerance in Populus
The experimental work presented here on the physiology and morphology of P. trichocarpa and P. deltoides provides a good insight into the ecophysiology and the genetic basis of drought tolerance in Populus and in particular, in their F2 hybrid Family. Studies of these and other genotypes have identified their remarkable yields when grown in short rotation coppice.
The study of gas exchange and stomatal dynamics revealed the different strategies that the parental species develop when they encounter drought conditions. The results showed the existence of contrasting patterns in stomatal regulation linked to the ontogenetic and developmental changes in the leaf, and an internal leaf blade structure linked to the response to drought. Important variations in stomatal conductance during daytime, leaf age and level of insertion are significantly different between P. trichocarpa and P. deltoids.
Trichome presence and development of intercellular spaces represent some of the most morphologically distinct features of the two grandparents influencing the differential response to CO2. The responses of the F2 showed the negative effect of drought on leaf growth, but also that while the leaf traits seem genetically more robust, cell traits were more affected by the environment. The contrasting responses in the two environmental conditions (UK vs Italy) make it possible, through QTL analysis, to propose 42 candidate genes that could potentially explain these responses and contribute to the understanding of the responses to the complex phenomenon of drought. This work raises several questions regarding the role of night conductance in P. trichocarpa and stomata evolution in Populus.
University of Southampton
Rodriguez-Acosta, Maricela
c7e42c85-eecb-4079-8d58-82506dbe61ad
2006
Rodriguez-Acosta, Maricela
c7e42c85-eecb-4079-8d58-82506dbe61ad
Rodriguez-Acosta, Maricela
(2006)
Ecophysiology and genetics of drought tolerance in Populus.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The experimental work presented here on the physiology and morphology of P. trichocarpa and P. deltoides provides a good insight into the ecophysiology and the genetic basis of drought tolerance in Populus and in particular, in their F2 hybrid Family. Studies of these and other genotypes have identified their remarkable yields when grown in short rotation coppice.
The study of gas exchange and stomatal dynamics revealed the different strategies that the parental species develop when they encounter drought conditions. The results showed the existence of contrasting patterns in stomatal regulation linked to the ontogenetic and developmental changes in the leaf, and an internal leaf blade structure linked to the response to drought. Important variations in stomatal conductance during daytime, leaf age and level of insertion are significantly different between P. trichocarpa and P. deltoids.
Trichome presence and development of intercellular spaces represent some of the most morphologically distinct features of the two grandparents influencing the differential response to CO2. The responses of the F2 showed the negative effect of drought on leaf growth, but also that while the leaf traits seem genetically more robust, cell traits were more affected by the environment. The contrasting responses in the two environmental conditions (UK vs Italy) make it possible, through QTL analysis, to propose 42 candidate genes that could potentially explain these responses and contribute to the understanding of the responses to the complex phenomenon of drought. This work raises several questions regarding the role of night conductance in P. trichocarpa and stomata evolution in Populus.
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Published date: 2006
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Local EPrints ID: 466048
URI: http://eprints.soton.ac.uk/id/eprint/466048
PURE UUID: 3a6941c2-070b-4be9-a7f5-448e24fa43bb
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Date deposited: 05 Jul 2022 04:08
Last modified: 16 Mar 2024 20:29
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Author:
Maricela Rodriguez-Acosta
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