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Evaluating germinability of eight desert halophytes under long-term seed storage: Implications for conservation

Plant Diversity 2019年第4期41卷 229-236页

作者： Sanjay Gairola Hatem A. Shabana Tamer Mahmoud Ali El-Keblawy Andrea Santo Sharjah Seed Bank and Herbarium Sharjah Research AcademyP.O.Box 60999SharjahUnited Arab Emirates Department of Applied Biology College of SciencesUniversity of SharjahP.O.Box 27272SharjahUnited Arab Emirates Independent Researcher SelargiusCagliariItaly

Ex situ conservation in seed banks is a potential complementary conservation strategy for native plant species.It is well established that ex situ seed banking of native wild plants prolongs seed viability and thereby preserves genetic and species diversity for future use.We evaluated ex situ storage potential of eight halophytic species from deserts in the United Arab Emirates(UAE)by studying seed germination.Specifically,we examined the germinability of freshly collected seeds and seeds stored for three years in a seed bank.We also examined the effect of light conditions on fresh and stored seed germination.Fresh seeds of seven of the eight species tested had a higher germination rates under 12/12 h light/dark fluctuations than did those exposed to total darkness.Storage reduced light sensitivity in Halocnemum strobilaceum,Suaeda aegyptiaca,Salsola drummondii and Salsola imbricata,but increased the requirement for light in Arthrocnemum macrostachyum.In Anabasis setifera,storage decreased germination percentage when there was a 12-hour light/dark fluctuation,but increased germination rate when exposed to the dark treatment.Storage significantly reduced germination in both the light/dark and dark treatments in Suaeda vermiculata and S.aegyptiaca.Germination speed also responded differently to storage;whereas Timson's index significantly increased in A.macrostachyum and H.strobilaceum,it significantly decreased for S.drummondii,S.aegyptiaca and S.vermiculata.Germination of these species at a range of temperatures requires further testing;additionally,we strongly suggest that these laboratory findings be complemented by field studies.

关键词： Ex situ conservation Halophytes Seed bank collection Seed germination Salt tolerance SSBH

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