Pollen grains that would easily germinate on stigma are
found to germinate in vitro, only when 10-200 ppm of boric
acid is added. This suggest that
(a) boron accelerates protein synthesis in pollen grain
(b) boron has an abrasive effect on the exine
(c) boric acid serves as a solvent for sporopollenins
(d) pollen wall is boron deficient and high levels of boron
occur in the style and stigma.
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