Acclimation of Photosynthetic Activity of Zantedeschia 'Best Gold' in Response to Temperature and Photosynthetic Photon Flux
| Autor: | Ian J. Warrington, Keith A. Funnell, Errol W. Hewett, Julie A. Plummer |
|---|---|
| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | Journal of the American Society for Horticultural Science. 127:290-296 |
| ISSN: | 2327-9788 0003-1062 |
| Popis: | Photosynthetic activity of individual leaves of Zantedeschia Spreng. `Best Gold' aff. Z. pentlandii (Wats.) Wittm. [syn. Richardia pentlandii Wats.] (`Best Gold'), were quantified with leaf expansion and diurnally, under a range of temperature and photosynthetic photon flux (PPF) regimes. Predictive models incorporating PPF, day temperature, and percentage leaf area expansion accounted for 78% and 81% of variation in net photosynthetic rate (Pn) before, and postattainment of, 75% maximum leaf area, respectively. Minimal changes in Pn occurred during the photoperiod when environmental conditions were stable. Maximum Pn (10.9μmol·m-2·s-1 or 13.3 μmol·g-1·s-1) occurred for plants grown under high PPF (694 μmol·m-2·s-1) and day temperature (28 °C). Acclimation of Pn was less than complete, with any gain through a greater light-saturated photosynthetic rate (Pmax) at high PPF also resulting in a reduction in quantum yield. Similarly, any gain in acclimation through increased quantum yield under low PPF occurred concurrently with reduced Pmax. It was concluded that Zantedeschia `Best Gold' is a shade tolerant selection, adapted to optimize photosynthetic rate under the climate of its natural habitat, by not having obligate adaptation to sun or shade habitats. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|