Dormance, germination et contenu protéique des semences de deux populations de Schoenus nigricans cueillies à des altitudes différentes

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Abstract
The germination of seeds of two populations of Schoenus nigricans L. collected at two middle-west Sardinian sites at 5 and at 800 m above sea level were studied. Germination took place in the dark, in deionized water, at 10, 20, or 30 °C or at alternating temperatures (10:20 °C) with a 12-h thermoperiod. The tests of 60-day duration, demonstrated that 30 °C is an inhibiting temperature for the seeds here considered, while the alternating (10:20 °C) temperatures increase the germination compared with the constant (10 and 20 °C) conditions. This different behaviour was analysed with respect to the dormancy and germination of the seeds collected at the two stations. We suggest that, beyond the habitat factors, the morphological difference between the seeds are responsible for the results presently considered. The remarkable qualitative and quantitative differences concern mostly the protein content in the two seed populations. The environmental characteristics of the collecting sites of Schoenus nigricans L. are also discussed in detail.

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