Embryo sac development and fertilization aspects in the self-compatible almond (Prunus dulcis (Mill.) ) D.A. Webb cv. Tuono

Ahmed Oukabli; Wallali, L.D.E.; Ali Lansari; Abdelhadi Abousalim; Egea, J.

Fruits Paris 56(2): 93-99

2001


Accession: 003431990

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Abstract
The optimization of fruit setting in almond is related to the success of pollination and fertilization. The reproductive phase, particularly the embryo sac development, and the fertilization aspects are important to know taking into account the recent acquisition of the self-compatibility character by this species. Flowers of the self-compatible variety "Tuono" were manually pollinated and fixed at intervals of time varying from 1 to 20 d after pollination, then they were cut to a 3- micro m thickness for histological studies. At the anthesis, the female gametophyte of the variety "Tuono" is at the four tetrad stage for 50% of the ovules observed in the embryo sac. The fusion of the polar nuclei was observed 5 d after pollination. Two weeks later, the sac contains a coenocytic framework in which the triploid nuclei of the endosperm multiply. The zygote, visible as of the second week after pollination, is located at the micropylar level. It developed in a proembryo 20 d after pollination.