Development of Embryo

The embryo development was outlined by Kanta (1962). The synergids are evanescent. The zygote divides simultaneously with the primary endosperm nucleus. The first wall is obliquely longitudinal or transverse. The terminal cell resulting from the above division is larger and richly cytoplasmic, the basal cell smaller and with scanty cytoplasm. Further developmental stages have not been clearly studied. In 50 per cent of the ovules (in the material studied by her) the zygote did not develop further but degenerated due to the deposition of calcium oxalate crystals (Kanta 1962).

The suspensor of the developing embryo has larger, highly vacuolated cells having scanty cytoplasm; while the cells toward the tip of the embryo are rich in cytoplasm and are smaller in size. The embryo has prominent ridges and furrows and when seen

Figure 2.18 Development of embryo. 1. Upper portion of embryo showing syngamy and triple fusion; 2, 4. Two celled proembryo; 3, 5. Three celled proembryo; 6, 7. Two views showing a few celled embryo; 8. Advanced proembryo; 9-10. Whole mounts of pear shaped mature embryo. (1-8, x710; 9x199; 10x67) (After Kanta 1962).

Figure 2.18 Development of embryo. 1. Upper portion of embryo showing syngamy and triple fusion; 2, 4. Two celled proembryo; 3, 5. Three celled proembryo; 6, 7. Two views showing a few celled embryo; 8. Advanced proembryo; 9-10. Whole mounts of pear shaped mature embryo. (1-8, x710; 9x199; 10x67) (After Kanta 1962).

from the top it has a hexagonal appearance (Kanta 1962) (Fig, 2.18). The embryo is not fully differentiated even in fully ripe seeds. Further differentiation takes place during the process of germination when the cotyledons develop fully.

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