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Abstract Detail



Pollination Biology

Tel-Zur, Noemi [1], Asatryan, Armine [2].

Pollen tube growth and self-incompatibility in three Ziziphus species (Rhamnaceae).

We conducted a comparative analysis of fluorescence microscopy observations of pollen tube growth following controlled cross pollinations of emasculated flowers and self-pollinations of non-emasculated flowers in three Ziziphus species: Z. jujuba, Z. mauritiana and Z. spina-christi, which exhibit synchronous protandrous dichogamy. In addition, to test whether autonomous self-pollination, parthenocarpy or agamospermy occur, flowers were emasculated (or not) and covered. Fruit set and seed viability were monitored. The presence of binucleate pollen grains and the cessation of pollen tube growth in the style suggested that the self-incompatibility system operating in the studied Ziziphus species is gametophytically controlled. Controlled self-pollination in Z. mauritiana resulted in fruits that dropped off before maturation, whereas in Z. spina-christi the flowers dropped off one or two days after pollination. Following controlled self-pollination, small fruits lacking viable seeds were obtained in Z. jujuba, probably due to the stimulus provided by pollination (stimulative parthenocarpy). In the cultivar Tamar of Z. jujuba, the relatively high percentage of seedless fruits obtained in emasculated bagged flowers without hand pollination suggests that this cultivar can set seedless fruits without any pollination stimulus.

Broader Impacts:


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1 - Ben-Gurion University of The Negev, Dept. of Dryland Biotechnologies, Campus Sede-Boller, Sede-Boller, 84990, Israel
2 - Ben Gurion University, Israel

Keywords:
Fruit set
Parthenocarpy
Protandrous dichogamy
Ziziphus jujuba
Ziziphus mauritiana
Ziziphus spina-christi.

Presentation Type: Oral Paper:Papers for Topics
Session: 43
Location: Melrose/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 11:00 AM
Number: 43003
Abstract ID:99
Candidate for Awards:None


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