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Seed dormancy,germination and storage behavior of magnolia sinica,a plant species with extremely small populations of magnoliaceae

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Plant Diversity 2022年第1期44卷 94-100页

作者： Liang Lin Lei Cai Lei Fan Jun-Chao Ma Xiang-Yun Yang Xiao-Jian Hu The Germplasm Bank of Wild Species Kunming Institute of BotanyChinese Academy of SciencesKunming650201YunnanChina Yunnan Key Laboratory for Integrative Conservation of Plant Species with Extremely Small Populations Key Laboratory far Plant Diversity and Biogeography of East AsiaKunming Institute of BotanyChinese Academy of SciencesKunming650201YunnanChina

magnolia sinica is one of the most endangered magnoliaceae species in China.Seed biology information concerning its long-term ex situ conservation and utilization is insufficient.This study investigated dormancy status,germination requirements and storage behavior of M.sinica.Freshly matured seeds germinated to ca.86.5%at 25/15℃but poorly at 30℃;GA3 and moist chilling promoted germination significantly at 20℃.Embryos grew at temperatures(alternating or constant)between 20℃and 25℃,but not at 5℃or 30℃.Our results indicate that M.sinica seeds possibly have non-deep simple mor-phophysiological dormancy(MPD).Seeds survived desiccation to 9.27%and 4.85%moisture content(MC)as well as a further 6-month storage at-20℃and in liquid nitrogen,including recovery in vitro as excised embryos.The established protocol ensured that at least 58%of seedlings were obtained after both cold storage and cryopreservation.These results indicate that both conventional seed banking and cryopreservation have potential as long-term ex situ conservation methods,although further optimized approaches are recommended for this critically endangered magnolia species.

关键词： magnolia sinica Seed Dormancy Storage behavior Cryopreservation Excised embryo

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维普期刊数据库

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Reproductive biology of magnolia sinica(magnoliaecea),a threatened species with extremely small populations in Yunnan,China

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Plant Diversity 2016年第5期38卷 253-258页

作者： Ye Chen Gao Chen Jing Yang Weibang Sun Kunming Botanical Garden Kunming Institute of BotanyChinese Academy of SciencesKunming650201 YunnanChina University of Chinese Academy of Sciences 100049 BeijingChina

magnolia sinica is one of the most threatened trees endemic to Southeast Yunnan.Based on our investigations,only 52 individuals and eight populations are found in the wild.M.sinica has been categorized as Critically Endangered on the IUCN Red List and identified as a "Plant Species with Extremely Small Populations(PSESP)".Its fruit/seed set is very low and seedlings are rarely found in the wild.It is hypothesized that it may encounter obstacles to reproductive success.This study,therefore,focuses on its reproductive biology,knowledge of which is essential for effective conservation.Flowers of this species are protogynous and nocturnal,and possess a two-day rhythm of sexual presentation.For the first night of anthesis,the flowers are in the pistillate stage during which tepals open at dusk and close approx.1 h later(except for the open outer ones).They remain closed until the next afternoon,when flowers,now in the staminate stage,re-open and remain so until the tepals drop.Nocturnal beetles enter into the flowers and remain trapped throughout the night as the flower closes,during which time they feed on tepals.Pollen-gathering bees are found to visit the re-opened flowers and the beetles are released during this stage.Two species of Pleocomidae and Curculionidae beetles appear to be effective pollinators.M.sinica is a self-compatible,pollinator-dependent species,and its fruit/seed set can be significantly increased by hand-pollination.No functional seed dispersers have been found in its extant natural habitats.These findings suggest that it may face both pollination and seed disperser insufficiencies in its current fragmented habitats,which may account for its low regeneration.Here we propose conservation strategies based on our findings.

关键词： magnolia sinica PSESP Flowering process Pollination Seed dispersal Germination

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