New Zealand Journal of Botany abstracts

---

Plant Growth Substances in Pollen of Pinus radiata at Different Levels of Germination

G. B. Sweet and Philippa N. Lewis

Forest Research Institute, Rotorua

Abstract Pinus radiata pollen were examined by extraction and bioassay. Thirteen active substances were detected: five auxins, three inhibitors, four gibberellins, and one compound with some properties characteristic of both gibberellins and cytokinins. As the pollen germinated in vitro the quantities of some of these subtsances increased, others decreased, and still others remained constant. It is probable that the substance with both gibberellin and cytokinin affinities has a role in pollen-tube growth; and it is possible that, in vivo, one of the aqueous auxins may have a role in ovule development. Possible roles for some of the other hormones are briefly discussed.

Received 23 May 1970 New Zealand Journal of Botany 9: 146-56.

PDF file of entire paper: medium quality (492K); (scanned from paper original: notes about this process)

---

This year's abstracts | Journal home page | All abstracts | Publishing home page