Starch distribution in pear tree organs in relation to training systems, rootstocks and fruit quality

Mesa Juliani, Karen (2015) Starch distribution in pear tree organs in relation to training systems, rootstocks and fruit quality, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Scienze e tecnologie agrarie, ambientali e alimentari, 27 Ciclo. DOI 10.6092/unibo/amsdottorato/7158.
Documenti full-text disponibili:
[img]
Anteprima
Documento PDF (English) - Richiede un lettore di PDF come Xpdf o Adobe Acrobat Reader
Download (1MB) | Anteprima

Abstract

Starch is the main form in which plants store carbohydrates reserves, both in terms of amounts and distribution among different plant species. Carbohydrates are direct products of photosynthetic activity, and it is well know that yield efficiency and production are directly correlated to the amount of carbohydrates synthesized and how these are distributed among vegetative and reproductive organs. Nowadays, in pear trees, due to the modernization of orchards, through the introduction of new rootstocks and the development of new training systems, the understanding and the development of new approaches regarding the distribution and storage of carbohydrates, are required. The objective of this research work was to study the behavior of carbohydrate reserves, mainly starch, in different pear tree organs and tissues: i.e., fruits, leaves, woody organs, roots and flower buds, at different physiological stages during the season. Starch in fruit is accumulated at early stages, and reached a maximum concentration during the middle phase of fruit development; after that, its degradation begins with a rise in soluble carbohydrates. Moreover, relationships between fruit starch degradation and different fruit traits, soluble sugars and organic acids were established. In woody organs and roots, an interconversion between starch and soluble carbohydrates was observed during the dormancy period that confirms its main function in supporting the growth and development of new tissues during the following spring. Factors as training systems, rootstocks, types of bearing wood, and their position on the canopy, influenced the concentrations of starch and soluble carbohydrates at different sampling dates. Also, environmental conditions and cultural practices must be considered to better explain these results. Thus, a deeper understanding of the dynamics of carbohydrates reserves within the plant could provide relevant information to improve several management practices to increase crop yield efficiency.

Abstract
Tipologia del documento
Tesi di dottorato
Autore
Mesa Juliani, Karen
Supervisore
Co-supervisore
Dottorato di ricerca
Scuola di dottorato
Scienze agrarie
Ciclo
27
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
carbohydrate allocation, carbohydrate storage, crop yield efficiency, gas-chromatography, non-structural, pear training systems, rootstocks, soluble carbohydrate, spectrophotometer
URN:NBN
DOI
10.6092/unibo/amsdottorato/7158
Data di discussione
18 Maggio 2015
URI

Altri metadati

Statistica sui download

Gestione del documento: Visualizza la tesi

^