Dormancy release and flowering time in Ziziphus jujuba Mill., a "direct flowering" fruit tree, has a facultative requirement for chilling

Michal Meir, Vanessa Ransbotyn, Eran Raveh, Simon Barak, Noemi Tel-Zur, Michele Zaccai

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In deciduous fruit trees, the effect of chilling on flowering has mostly been investigated in the "indirect flowering" group, characterized by a period of rest between flower bud formation and blooming. In the present study, we explored the effects of chilling and chilling deprivation on the flowering of Ziziphus jujuba, a temperate deciduous fruit tree belonging to the "direct flowering" group, in which flower bud differentiation, blooming and fruit development occur after dormancy release, during a single growing season. Dormancy release, vegetative growth and flowering time in Z. jujuba cv. Ben-Li were assessed following several treatments of chilling. Chilling treatments quantitatively decreased the timing of vegetative bud dormancy release, thereby accelerating flowering, but had no effect on the time from dormancy release to flowering. Trees grown at a constant temperature of 25 °C, without chilling, broke dormancy and flowered, indicating the facultative character of chilling in this species. We measured the expression of Z. jujuba LFY and AP1 homologues (ZjLFY and ZjAP1). Chilling decreased ZjLFY expression in dormant vegetative buds but had no effect on ZjAP1expression, which reached peak expression before dormancy release and at anthesis. In conclusion, chilling is not obligatory for dormancy release of Z. jujuba cv. Ben-Li vegetative buds. However, the exposure to chilling during dormancy does accelerate vegetative bud dormancy release and flowering.

Original languageEnglish
Pages (from-to)118-127
Number of pages10
JournalJournal of Plant Physiology
Volume192
DOIs
StatePublished - 15 Mar 2016

Keywords

  • Dormancy release
  • Flowering
  • Rhamnaceae
  • Ziziphus jujuba
  • ZjAP1
  • ZjLFY

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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