Bidirectional Pollination of Angiosperm and Gymnosperm Ovules

摘要

Pollen grains of Pinus wallichiana, P. mugo, P. ponderosa and Ephedra distachya germinated at various intensities on in vitro cultured placentas of 32 angiosperm species. Pollen of the same gymnosperms did not form tubes on stigmas of pistils cultured u