Photosynthetica 2003, 41(4):551-557 | DOI: 10.1023/B:PHOT.0000027519.26832.f3

Photosynthetic Activity in Seed Wings of Dipterocarpaceae in a Masting Year: Does Wing Photosynthesis Contribute to Reproduction?

T. Kenzo1, T. Ichie2, I. Ninomiya3, T. Koike2
1 United Graduate School of Agricultural Sciences, Ehime University, Matsuyama, Japan
2 Hokkaido University Forests, FSC, Sapporo, Japan
3 Faculty of Agriculture, Ehime University, Matsuyama, Japan

The photosynthetic rate of seed wings developed from sepals was compared with the leaf photosynthetic rate in nine dipterocarp tree species (Dipterocarpus pachyphyllus, Dryobalanops aromatica, Dryobalanops lanceolata, Shorea beccariana, Shorea ferruginea, Shorea macroptera ssp. bailonii, Shorea macroptera ssp. macropterifolia, Shorea pilosa, and Vatica spp.). The wings showed positive photosynthetic activity, but at much lower rates than in the leaves. The daily CO2 uptake of wings showed slightly negative values in diurnal gas exchange measurements, even in D. aromatica that showed the highest photosynthetic capacity of all nine species. This low photosynthetic rate in the wings may be the result of low nitrogen and chlorophyll contents in the wing compared with leaves. However, the wings had a higher C/N ratio than leaves, and were thicker. Hence, dipterocarp wings have physical strength and defence against herbivores as higher priorities than photosynthetic activity.

Additional key words: chlorophyll; daily carbon gain; Dipterocarpus; Dryobalanops; respiration; Sarawak; sepal; Shorea; tropical rainforest; Vatica

Published: December 1, 2003  Show citation

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Kenzo, T., Ichie, T., Ninomiya, I., & Koike, T. (2003). Photosynthetic Activity in Seed Wings of Dipterocarpaceae in a Masting Year: Does Wing Photosynthesis Contribute to Reproduction? Photosynthetica, 41(4), 551-557. doi: 10.1023/B:PHOT.0000027519.26832.f3
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