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KMID : 0903619760170020157
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Journal of the Korean Society for Horticultural Science
1976 Volume.17 No. 2 p.157 ~ p.163
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Autoradiographic Studies of Methionine Incorporation into and Exclusion of Pectin from pollen Tubes of Various Ornamental Plant Species
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Abstract
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It appears from the present studies that pollen from certain angiosperm species characteristically respond to physiological levels of methionine and show promotive growth effects in artificial cultural media, specifically Liliacease and Amaryllidaceae. Some of other species did not show much of the methionine effect, if any at all.
When pollen from certain species demonstrated the promotive methionine effect, an addition of calcium ions to the medium resulted in almost doubled length of pollen tubes. Apparently calciumbinding sites, pectin substances on the tube wall, become increased in this manner. This was also suggested by cellulase digestion of pollen-tube walls having distinguishable retaining of the promotive calcium action, whereas pectinase lessened it drastically. If ethionine was used in the equimolar concentration, the pollen growth was greatly inhibited. This suggested that ethionine suppresses the methylation process leading to pectin synthesis in growing pollen tubes.
Evidence from autoradiography with ^(14)C-methyl methionine indicated that methionine incorporation into the pollen-tube wall can be used as a pectin precursor in pollen-tube growth of at least certain ornamental plant species.
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