Analysis of Growth and Water Relations of Tomato Fruits in Relation to Air Vapor Pressure Deficit and Plant Fruit Load
| Autor: | Cherubino Leonardi, Christian Gary, Nadia Bertin, Soraya Guichard |
|---|---|
| Přispěvatelé: | Unité de recherche Plantes et Systèmes de Culture Horticoles (PSH), Institut National de la Recherche Agronomique (INRA), Dipartimento di OrtoFloroArboricoltura e Tecnologie Agroalimentari, University of Catania, University of Catania [Italy] |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
0106 biological sciences
vapeur d'eau Vapour Pressure Deficit croissance végétale VPD Turgor pressure solanum lycopersicon L Plant Science tomato Phloem 01 natural sciences transpiration plant fruit load 03 medical and health sciences tomate Xylem développement de la plante Osmotic pressure [SDV.BV]Life Sciences [q-bio]/Vegetal Biology water potential water requirement 030304 developmental biology Transpiration water deficit 2. Zero hunger 0303 health sciences Chemistry déficit hydrique fungi fruit quality Plant physiology food and beverages plant growth Agronomy Volume (thermodynamics) besoin en eau Agronomy and Crop Science water flux fruit growth 010606 plant biology & botany |
| Zdroj: | Journal of Plant Growth Regulation Journal of Plant Growth Regulation, Springer Verlag, 2005, 24, pp.1-13. ⟨10.1007/s00344-005-0040-z⟩ |
| ISSN: | 0721-7595 1435-8107 |
| Popis: | The influence of air vapor pressure deficit (VPD) and plant fruit load on the expansion and water relations of young tomato fruits grown in a glasshouse were evaluated under summer Mediterranean conditions. The contributions of phloem, xylem and transpiration fluxes to the fruit volume increase were estimated at an hourly scale from the growth curves of intact, heat-girdled and detached fruits, measured using displacement transducers. High VPD conditions reduced the xylem influx and increased the fruit transpiration, but hardly affected the phloem influx. Net water accumulation and growth rate were reduced, and a xylem efflux even occurred during the warmest and driest hours of the day. Changes in xylem flux could be explained by variations in the gradient of water potential between stem and fruit, due to changes in stem water potential. Misting reduced air VPD and alleviated the reduction in fruit volume increase through an increase in xylem influx and a decrease in fruit transpiration. Under low fruit load, the competition for assimilates being likely reduced, the phloem flux to fruits increased, similarly to the xylem and transpiration fluxes, without any changes in the fruit water potential. However, different diurnal dynamics among treatments assume variable contributions of turgor and osmotic pressure in F3 and F6 fruits, and hypothetical short-term variations in the water potential gradient between stem and fruit, preventing xylem efflux in F3 fruits. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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