1981 Volume 50 Issue 3 Pages 350-354
Pollen-tube growths of L.×elegans and L. regale in the style of L. longiflorum were examined as the representative case of ′half-growth interspecific incompatibility′ and ′short-growth interspecific incompatibility′, respectively.
The pollen-tube growth of L.×elegans:
The pollen-tube growth suddenly slowed down half-way down the lower portion of the style of L. longiflorum between three and four days after pollnation. By comparing with the tube growth in grafted styles, it was suggested that the pollen-tube itself rather than an interaction with the lower portion of the style, was responsible for the growth cessation, because the pollen- tube seemel to hene a critical period of time to grow.
The pollen-tube growth of L. regale:
From the facts that the pollen-tube in the style of L. longiflorum showed abnormal growth in contrast with that on stigma-exudate from L. longiflorum and that the growth was restored by injection of the exudate into stylar canal, it was indicated that the tube growth might be inhibited by an interaction between the pollen-tube and the canal tissue rather than by the contents of exudate.