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Germination response of desert annuals to shrub facilitation is species specific but not ecotypic

Journal of Plant Ecology 2017年第2期10卷 364-374页

作者： Amanda R.Liczner Diego A.Sotomayor alessandro filazzola Christopher J.Lortie Department of Biology York University4700 Keele St.TorontoOntario M3J1P3Canada Department of Geography York University4700 Keele St.TorontoOntario M3J1P3Canada

Aims Positive plant interactions can promote higher species density of beneficiary species in ***,there is limited evidence examining the trait sets of seeds from beneficiary *** this study,we examined the hypothesis that shrubs(benefactors)influ-ence the germination of desert annuals(beneficiaries)and promote ecotypic differentiation by generating distinct microhabitats through abiotic stress *** following predictions were tested using growth chambers and field-collected seeds:(i)seed mass and viability will be greater and less variable for seeds collected from within shrub understory relative to seeds from open microhabitats,(ii)germination of seeds from shrub and open microhabitats will be greatest under simulated home(source)conditions,(iii)seeds from the shrub microhabitat will adaptively accelerate their germination rate when germinated in simulated home(source)microhabitats relative to their simulated away(reciprocal)*** Seeds and their associated maternal plants were collected from four annual species found within a shrub understory(Larrea triden-tata)and open microhabitats in the Mojave Desert of California(35.30ºN,117.26ºW,793 m.a.s.l.),and then reciprocally germi-nated in growth chambers simulating both microclimatic *** germination and germination rate was measured every 4-5 days for 42 *** Findings There was no significant difference in the mean or coefficient of variation for seed mass and viability between the shrub and open *** source of the seeds did not significantly impact the cumulative germination,and there was no accelerated rate of germination within potential species ecotypes thereby suggesting no ecotypic *** germination was signifi-cantly higher within the shrub-simulated microhabitat for three out of the four species *** germination and germina-tion rate were significantly different between ***,shrubs

关键词： ecotypes facilitation germination seeds viability

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