Affordable Access

deepdyve-link
Publisher Website

Male meiosis in sweet cherry is constrained by the chilling and forcing phases of dormancy.

Authors
  • Fadón, Erica1, 2, 3
  • Herrera, Sara2
  • Herrero, María3
  • Rodrigo, Javier2, 4
  • 1 INRES - Gartenbauwissenschaft, Universität Bonn, Bonn, Germany. , (Germany)
  • 2 Unidad de Hortofruticultura, Centro de Investigación y Tecnología Agroalimentaria de Aragón (CITA), Zaragoza, Spain. , (Spain)
  • 3 Departamento de Pomología, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (EEAD - CSIC), Zaragoza, Spain. , (Spain)
  • 4 Instituto Agroalimentario de Aragón - IA2 (CITA - Universidad de Zaragoza), Zaragoza, Spain. , (Spain)
Type
Published Article
Journal
Tree Physiology
Publisher
Oxford University Press
Publication Date
Apr 08, 2021
Volume
41
Issue
4
Pages
619–630
Identifiers
DOI: 10.1093/treephys/tpaa063
PMID: 32453409
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Male meiosis in temperate fruit trees occurs in the anthers once a year, synchronized with the seasons. The alternation of dormant and growth cycles determines the optimum moment for the male gametophyte formation, a process sensitive to both cold and warm temperatures. This ensures pollen viability and subsequent reproduction success that guarantee fruit production. In this work, we explore how male meiosis is framed by seasonality in sweet cherry. For this purpose, the dormant phases, male meiosis and blooming dates were established in four cultivars with different flowering dates and chilling requirements over 7 years. The chilling and heat requirements for each cultivar were empirically estimated, and chilling and heat temperatures were quantified according to the Dynamic and Growing Degree Hours (GDH) models, respectively. Endodormancy was overcome approximately a fortnight earlier during the colder winters than during the milder winters. Against our initial hypothesis, these differences were not clearly reflected in the time of male meiosis. The period between chilling fulfillment and meiosis lasted several weeks, during which a high amount of GDH accumulated. Results showed that male meiosis is conditioned by endodormancy but especially by warm temperatures, during the forcing period. This differs from what has been described in other related species and creates a framework for further studies to understand the strategies of synchronizing dormancy with seasons. © The Author(s) 2020. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: [email protected]

Report this publication

Statistics

Seen <100 times