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Delayed seed dispersal species and related traits in the desert of the United Arab Emirates

Journal of Arid Land 2021年第9期13卷 962-976页

作者： Teresa NAVARRO Hatem A SHABANA Ali EL-KEBLAWY Noelia HIDALGO-TRIANA Department of Botany and Plant Physiology Faculty of ScienceUniversity of MalagaMalaga 29080Spain Sharjah Seed Bank and Herbarium Sharjah Research AcademySharjah 60999United Arab Emirates Nature Conservation Sector Egyptian Environmental Affairs AgencyCairo 11728Egypt Department of Applied Biology Faculty of ScienceUniversity of SharjahSharjah 27272United Arab Emirates Department of Biology Faculty of ScienceAl-Arish University 45511Egypt

The ability of plants to safely retain seeds in the mother plant is an adaptive mechanism described in many desert plants.However,research about delayed seed dispersal species in the desert of the United Arab Emirates(UAE)is lacking.This study aims to identify these delayed seed dispersal species and assess the relationships of the presence of delayed seed dispersal with plant growth form,habit,spatial dispersal,antitelechoric mechanism,and seed release time.The relationships between the presence of delayed seed dispersal and the above studied traits were assessed by using the Pearson Chi-square test and Nonlinear Principal Components Analysis(NLPCA).Results showed that a total of 46 delayed seed dispersal species were recorded(15.0%of 307 studied species)and the highest incidence occurred in the Fabaceae family(17.4%).Delayed seed dispersal species were predominantly perennial plants(73.9%)with spatial restricted dispersal(67.4%),which released seed in the dry season(45.7%).The dominant groups of delayed seed dispersal species were persistent fruits species and synaptospermy(28.3%).All graminoids showed persistent lignified fruits,while prostrate annuals were basicarpic species with myxospermy.Sandy habitats had the highest number of delayed seed dispersal species(54.3%),whereas salt flats had the lowest(23.9%).In the desert of the UAE,delayed seed dispersal species spread seeds until the end of the dry and windy season,thus breaking seed dormancy at this time and ensuring seed germination in the next arrival of the rainy season.This morphological and ecological adaptation of delayed dispersal species is essential to the survival and sustainable development of vegetation in desert environments.

关键词： Arabian desert delayed dispersal restricted dispersal persistent fruits seed release time myxospermy synaptospermy

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

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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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Salvia ceratophylla L. from South of Jordan: new insights on chemical composition and biological activities

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Natural Products and Bioprospecting 2020年第5期10卷 307-316页

作者： Mohammad Sanad Abu-Darwish Célia Cabral Zulfigar Ali Mei Wang shabana IKhan Melissa RJacob Surendra KJain Babu LTekwani Fazila Zulfiqar Ikhlas AKhan hatem Taifour Lígia Salgueiro Thomas Efferth Department of Basic and Applied Sciences Al-Balqa Applied UniversityAl-Salt 19117Jordan National Center for Natural Products Research School of PharmacyUniversity of MississippiUniversityMS 38677USA Coimbra Institute for Clinical and Biomedical Research(iCBR) Faculty of MedicineUniversity of Coimbra3000-548 CoimbraPortugal Center for Innovative Biomedicine and Biotechnology(CIBB) University of Coimbra3000-548 CoimbraPortugal Centre for Functional Ecology Department of Life SciencesUniversity of CoimbraCalçada Martim de Freitas3000-456 CoimbraPortugal School of Geosciences University of Edinburgh219 Crew BuildingKing’s BuildingsEdinburgh EH93FFUK CIEPQPF/Faculty of Pharmacy University of CoimbraHealth Sciences CampusAzinhaga de S.Comba3000-548 CoimbraPortugal Department of Pharmaceutical Biology Institute of Pharmaceutical and Biocmedical SciencesJohannes Gutenberg UniversityStaudinger Weg 555128 MainzGermany

In Jordan,Salvia ceratophylla L.is traditionally used in the treatment of cancer,microbial infections,and urinary disorders.This study aimed:(1)to chemically characterize S.ceratophylla essential oil(EO)from South Jordan,by gas chromatography(GC)and gas chromatography-mass spectrometry(GC-MS);and(2)to evaluate in vitro the cytotoxic,anti-inflammatory,and antiprotozoal activities of the EO,it’s predominant components,and the hexane(A),ethyl acetate(B),methanol(C)and crude-methanol extracts(D).The analysis revealed that the EO has 71 compounds,with linalool(54.8%)as main constitu-ent.Only the hexane extract(A)showed some cytotoxic activity against SK-MEL,KB,BT-549,SK-OV-3,LLC-PK1 and VERO cells lines with IC50 between 60 and>100μg/mL.The EO inhibited NO production(IC5090μg/mL)and NF-κB activity(IC5038μg/mL).The extracts A,B,and D inhibited NO production and NF-κB activity with IC50 between 32 and 150μg/mL.Linalool considerably inhibited NO production(IC5018μg/mL).The extracts tested did not exhibit antileish-manial activity.Regarding antitrypanosomal activity,the EO exhibited significant results with IC502.65μg/mL.In conclu-sion,Jordan S.ceratophylla EO represents a rich source of linalool and bears a promising therapeutic potential for further antitrypanosomal drug development.

关键词： Lamiaceae Essential oil Chemical composition Cytotoxicity Anti-inflammatory activity Neglected diseases

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