Following 4 and 8 h after self-incompatible pollination of Petunia hybrida plants, ethylene evolution and the contents of IAA, ABA, and cytokinins were measured in pistils and their parts (stigma, style, and ovary). The germination and initial growth of pollen tubes within the initial 4 h of the experiment were accompanied with an almost tenfold increase of the rate of ethylene production by the stigma and a twofold increase of the ABA content in the stigma and style. The inhibition of pollen tube growth in the style tissues during next 4 h coincided with a fivefold increase in the cytokinin content in the style, while high ABA content was maintained in the stigma and style. The authors conclude that phytohormones participate in the mechanism of gametophyte self-incompatibility.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 18, 2004
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