Summer drought impacts annual shoot growth dynamics in apple tree: a comparative study on three cultivars
| Autor: | Benoît Pallas, Evelyne Costes, D. Chen, Sébastien Martinez, Y. Wang |
|---|---|
| Přispěvatelé: | Amélioration génétique et adaptation des plantes méditerranéennes et tropicales (UMR AGAP), Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Northwest A&F University, Institute of Soil and Water Conservation |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
période estivale ramification pommier Apple tree Horticulture Biology 010603 evolutionary biology 01 natural sciences Shoot growth dynamics cycle de croissance Tree architecture [SDV.BV]Life Sciences [q-bio]/Vegetal Biology Cultivar Malus x domestica malus domestica Vegetal Biology architecture de l'arbre Drought déficit hydrique fungi food and beverages dynamique de croissance 15. Life on land Rhythmic growth Shoot Biologie végétale 010606 plant biology & botany |
| Zdroj: | 30. International Horticultural Congress IHC2018 30. International Horticultural Congress IHC2018, Aug 2018, Istanbul, Turkey 2018; 30. International Horticultural Congress IHC2018, Istanbul, TUR, 2018-08-12-2018-08-16 |
| ISSN: | 2406-6168 0567-7572 |
| Popis: | Plants respond to drought by adjusting different growth and developmental processes. This study investigated the impact of a summer water deficit on shoot growth dynamics, comparatively in three apple cultivars, in their second and third year of growth. Trees were differentially irrigated to induce water stress (WS) or well - watered conditions (WW). WS effects were evaluated on long shoots in either terminal or lateral position, by observing metamer appearance rate, growth duration and arrest time. In the three cultivars, WS promoted growth cessations (GC) during summer leading to bicyclic shoots. These GC occurred early in the season, when WS conditions were mild. Consistently with tree ontogeny, the number of shoots that resumed growth after summer arrest decreased between the two consecutive years, but more in WS than WW conditions. In both monocyclic and bicyclic shoots, WS provoked a more precocious GC at the end of the growth season. Even though WS impact slightly differed among cultivars, a reduction in shoot neoformation and an increase in summer arrest appeared as a common response of apple tree to water deficit. This can be interpreted as an avoidance strategy to reduce the tree leaf area, leading to a modification of the within - tree shoot demography in favor of medium and short shoots. |
| Databáze: | OpenAIRE |
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