Photosynthetica 2013, 51(2):312-316 | DOI: 10.1007/s11099-013-0022-5

The photosynthetic performance of sterile and fertile sporophytes in a natural population of the fern Dryopteris affinis

L. Paoli1,2,*, M. Landi1,3
1 Department of Environmental Science, University of Siena, Siena, Italy
2 Institute of Botany, Slovak Academy of Sciences, Bratislava, Slovakia
3 Ufficio Territoriale per la Biodiversità di Siena, Corpo Forestale dello Stato, Siena, Italy

We studied the photosynthetic performance of sterile and fertile sporophytes in a natural population of the fern Dryopteris affinis growing within a riparian forest (Central Italy) using chlorophyll (Chl) a fluorescence transients, the OJIP phase, where O is for the minimum fluorescence, P is for the peak (the maximum), and J and I are inflections. The "vitality" of the samples was assessed by the maximum quantum yield of primary photochemistry obtained indirectly from the fluorescence data (Fv/Fm); in the same way, the so-called performance index (PIABS) was obtained from fluorescence data. The photosynthetic performance (inferred from PIABS) of D. affinis changed significantly with the seasonal development of the fronds. The highest photosynthetic performance was recorded in the summer, corresponding to the period of spore release. The photosynthetic performance decreased in the winter, down to the minimal values of senescent fronds reached at the end of the seasonal cycle (May-June). On the whole, during the seasonal development, sterile and fertile fronds had a similar photosynthetic behaviour, as inferred from fluorescence data. At the end of spore maturation and dispersal (September-October), the fertile fronds showed somewhat lower photosynthetic performance than the sterile fronds, as revealed by PIABS. Being a long-lived fern, confined to humid and undisturbed sites in the Mediterranean, D. affinis deserves to be further investigated as a potential indicator of ecological continuity in Mediterranean riparian forests.

Keywords: chlorophyll fluorescence induction; JIP-test; Mediterranean area; performance index; photosynthesis; pteridophytes

Received: February 9, 2012; Accepted: December 18, 2012; Published: June 1, 2013Show citation

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Paoli, L., & Landi, M. (2013). The photosynthetic performance of sterile and fertile sporophytes in a natural population of the fern Dryopteris affinis. Photosynthetica, 51(2), 312-316. doi: 10.1007/s11099-013-0022-5.
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