In vitro Sensitivity of Pinus pinaster and P. pinea Pollen Grains to Different pH Values

1991

S. 135-142

3 Abb., 2 Tab., 35 Lit. Ang.

Unselbständiges Werk

200048386

The effects of different pH values (pH 5.5 to 3.5) on pollen grain germination and pollen tube growth in Pinus pinaster Aiton and P. pinea L. were investigated in two different media, with and without sucrose. Our results indicate that pollen behaviour was significantly affected by pH 3.5 in both species. As regards germination, different pH values had the same effect on both species: the germination percentage was negatively influenced by pH 3.5. The addition of sucrose had a favourable effect on germination rate, though less significantly in P. pinea. Pollen tube growth in both species proved similar in all treatments, except for the pH 3.5 in which elongation was considerably less than in the other media. A marked acceleration of tube growth was also obtained with the addition of sucrose. As regards bilateral pollen tubes, a negative effect of the acidity was found only in P. pinaster.