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۱Ecology of seed dormancy and germination of Carex divisa Huds , : Effects of stratification , temperature and salinity (انگلیسی)
نویسنده(ها): ، ، ،
اطلاعات انتشار: مجله بين المللي توليد گياهي، سوم،شماره۲(پياپي ۸)، April ۲۰۰۹، سال
تعداد صفحات: ۱۴
Carex divisa is a patrimonial rhizomatous species and acts as an important component of grazed wet permanent grassland on the French Atlantic coast. This study treated three storage regimes (wet–cold, dry–cold and dry–warm), burial in soil, fluctuating temperature and salinity on seed germination of C. divisa. The seeds were dormant at maturity. No seed germinated after 2 and 6 weeks of dry storage under laboratory conditions prior to the onset of the stratification treatment. Thus, the effect of after–ripening was not evident in C. divisa. Germination rate of 11.3% started only in the wet–cold stratification treatment after 2 months. Seeds that had been stored under wet–cold conditions for 8 months had a higher germination than seeds stored under dry–cold and dry–warm treatments for the same length of time. Seeds of C. divisa tested at 10–20 °C in light had no marked dormancy cycle, but in darkness under a fluctuating temperature regime (10–20 °C), C. divisa seems to exhibit annual dormancy cycles. There were no differences in germination between fluctuating temperatures 10–20 °C and 15–25 °C after 12 months in the wet–cold treatment. No germination occurred at fluctuating temperatures 0–10 °C. The highest percent germination was observed in distilled water, followed by 50 mM L–1 NaCl. The highest NaCl concentration (250 mM L–1) was found to inhibit seeds germination.
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