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The Influence of Photosynthetically Active Radiation and Vernalization on Flowering of Deschampsia flexuosa (L.) Trin. (Poaceae)

M. N. Foggo and I. J. Warrington
Functional Ecology
Vol. 3, No. 5 (1989), pp. 561-567
DOI: 10.2307/2389570
Stable URL: http://www.jstor.org/stable/2389570
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Influence of Photosynthetically Active Radiation and Vernalization on Flowering of Deschampsia flexuosa (L.) Trin. (Poaceae)
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Abstract

1 In open grasslands, Deschampsia flexuosa (L.) Trin. formed upright tussocks with massed, persistent flower culms. Under the shade of trees, the growth form was largely prostrate with few and solitary flower culms. 2 When plants of D. flexuosa were grown below a critical level of photosynthetically active radiation (PAR), the tillers produced remained in a juvenile stage and did not flower in spite of otherwise being provided with inductive conditions. 3 The critical daily light integral (DLI) below which plants did not flower was around 9 to 11 mol m-2 day-1. 4 After flower initiation had occurred and vernalization was complete, the proportion of tillers that actually flowered depended on the level of PAR the plant received. 5 Plants given 12 weeks of vernalization subsequently flowered under summer PAR conditions whereas those subjected to 6 weeks of vernalization did not. 6 Changes in spectral quality in shaded habitats are of minor importance compared with the absolute light level in determining flowering.

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