We quantified various endogenous cytokinins during wheat (Triticum aestivumL.) and dandelion (Taraxacum officinaleWeb.) ovary development. Wheat ovaries were studied at the following developmental stages: the mature embryo sac with eight nuclei (stage 1), the interphasic zygote 12 h and 24 h after fertilization (stage 2), and the onset of zygote division (stage 3). The dandelion ovaries were studied at the stage of the mature embryo sac (stage 1), in the interphase of the parthenogeneticaly developing ovule (stage 2), and during its first division (stage 3). The material was analyzed by the method of competitive solid-phase immunoenzyme assay (ELISA) using peroxidase-labeled anti-rabbit antibodies. The onset of embryogenesis in wheat and dandelion ovules was accompanied by the substantial rearrangement of their hormonal complexes, which preceded the morphogenetic processes leading to seed formation. This implies that the hormonal system of the whole maternal plant is involved in the induction of embryogenesis. The final stages of embryogenesis depend on the hormonal systems in the flower, ovary, and ovule.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 10, 2004
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