Influence of the pH of the stigmatic exudate on male-female interaction in Rosa hybrida L

✍ Scribed by Gudin, S. ;Arene, L.

• Publisher: Springer
• Year: 1991
• Tongue: English
• Weight: 314 KB
• Volume: 4
• Category: Article
• ISSN: 0934-0882
• DOI: 10.1007/bf00196496

✦ Synopsis

The in vitro germination of rose pollen is influenced by the pH of the medium. Both germination percentage and length of emitted pollen tubes were maximal for in vitro germination and tube elongation at pH 5 and minimal at pH 3 and 9 (Rosa hybrida L. var P 30 pollen). Three varieties characterized by having a stigmatic exudate of pH = 5 and another three varieties having one of pH = 9 were pollinated with the same pollen. Pollination effectiveness, as indicated by hip set number of hips pollinated x 10o~ and mean number of achenes A flowers / per hip, were significantly different: it was much higher for the varieties with the stigmatic exudate of pH = 5. pH control on pollination efficiency and subsequent fecundation success is proposed and discussed.