Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Italie → Endogenous and exogenous factors affecting root morphology and metabolism in olive

Università Politecnica delle Marche (2010)

Endogenous and exogenous factors affecting root morphology and metabolism in olive

POLVERIGIANI, SERENA

Titre : Endogenous and exogenous factors affecting root morphology and metabolism in olive

Auteur : POLVERIGIANI, SERENA

Université de soutenance : Università Politecnica delle Marche

Grade : Dottorato 2010

Résumé partiel
Modern and intensive orchards management requires a rational use of resources, aiming to maximize resources uptake and to maintain morphologic and functional balances. Many agronomic practices play a role which is mediated by the root system. A deep knowledge of environmental effects on root morphology, architecture, anatomy and metabolism is therefore necessary, in order to sustainably achieve the production target. Environmental factors effect is combined, on natural conditions, with plant phenology and internal physiological balances. Our goal, in order to achieve a background useful on plant management, was to integrate single factor influences and describe stimulus and competition relationships acting on root. We aimed to decipher dynamics determining resource use and allocation pattern. Root system cooperate to a wide set of functions, each of them is specifically carried out by precise root structures. Beside the main roots, the whole system is composed by roots so called “fine”. This last group may be profitably further divided into two main class : pioneer roots which are charged to soil exploration, resources transport, and reserves storage, and fibrous roots dedicated to nutrients and water absorption. Each of those two classes has a different metabolic cost and plays a different role in maintaining plant balances. One of the goals of the present work was to identify principles driving root building and consequences of resources allocation strategies on the whole system metabolism and efficiency in reaction to stress The current work also tried to clarify synergy and competition dynamics within organs as a fundament for root growth pattern seasonality and periodicity. Once clarified relationship for single plant, a further step was to insert the plant system in a phytocoenosis, in order to evaluate root behavior as influenced by interspecific relationships

Présentation

Page publiée le 23 avril 2021