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Control by the Embryosac Over Pollen Tube Growth in the Style of the Avocado (Persea americana Mill.)

M. Sedgley
The New Phytologist
Vol. 77, No. 1 (Jul., 1976), pp. 149-152
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/2433649
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Control by the Embryosac Over Pollen Tube Growth in the Style of the Avocado (Persea americana Mill.)
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Abstract

In experiments studying pollination of avocado it was observed that an average of sixty-six pollen grains germinated on the stigma. The tubes penetrated the stigma but about half developed swollen tips and proceeded no further than the base of the stigma. Reduction in tube number continued until between approximately half and three-quarters of the way down the style (1.75-2.5 mm) a single tube remained to reach the ovary containing a single embryosac. In 50% of the ovaries observed two embryosacs were present in the one ovule and 18% of these attracted two pollen tubes. Control by the embryosac over pollen tube growth is suggested.

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