Floral biology of Ziziphus mauritiana (Rhamnaceae)

Noemi Tel-Zur, Bert Schneider

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Floral development of the synchronous dichogamous species Ziziphus mauritiana, as followed by light and scanning electron microscopy (SEM), was divided into 11 stages using a series of landmark events. Main cellular events happen synchronously in the female and the male structures, such as meiosis in micro- and macrosporocyte cells, tetrad microspore formation and appearance of the functional megaspore cell, and onset of embryo sac differentiation coinciding with mitosis in the microspores. The last stage was characterized by anthesis and continued development of the flower, beginning with anther dehiscence (male phase) and proceeding to the female phase, which was characterized by style elongation. Flowers exhibit synchronous protandrous dichogamy; anthesis takes place in the morning (group A, e.g., clone Q-29) and afternoon (group B, e.g., clone B5/4). Stigma receptivity started after the male phase and occurred synchronously and complementarily with pollen dispersal in the two clones. Pollen viability and production were similar in the two clones, but the pollen diameter of Q-29 was significantly larger than that of B5/4. This study provides the basis for understanding the biological mechanisms regulating floral development, thus expanding the prospects for Z. mauritiana breeding programs and for further molecular and genetic studies of this species.

Original languageEnglish
Pages (from-to)73-85
Number of pages13
JournalSexual Plant Reproduction
Volume22
Issue number2
DOIs
StatePublished - 1 Jun 2009

Keywords

  • Floral organogenesis
  • Protandrous
  • Rhamnaceae
  • Synchronous dichogamy

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