Type of thesis
Response mechanisms of secondary meristem to abiotic stresses: drought effect on water and carbon relations in poplar
Scientific disciplinary sector
SCIENZE AGRARIE E BIOTECNOLOGIE - Agrobiosciences
relatore Prof. SEBASTIANI, LUCA
- cambial region
- osmotic balance
- water relation
Exam session start date
This PhD project is focused on the carbon and water relations during drought and the aim is to<br>advance the current understanding on the mechanisms underlying the water deficit response.<br>The goal is to comprehend:<br>i) the genotype-dependent features involved in the different response to drought of poplar<br>species in the stem, particularly in cambial region;<br>ii) the sink-source variations in the carbon and water balances in the different plant<br>compartments under water deficit;<br>iii) the role of carbohydrates in the osmotic processes and their preferential use under stress<br>conditions.<br>According with these aims, three experiments have been carried out:<br>a) Study of the genotype-dependent features involved in the different response to drought of poplar<br>species. In this work two different poplar species were used, Populus alba (L.) and Populus<br>deltoides (Marsh.), to evaluate the response to water deficit and rehydration in water and<br>carbohydrate relationships in cambial region.<br>b) Study of the role of carbohydrates, as osmotically active molecules, in water deficit response in P.<br>alba, focusing on the daily carbon and water balances within different tissues.<br>c) Study of the carbohydrate and water balances in poplar callus-medium system under osmotic stress and how these relationships can influence the osmoregulation and the growth.
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