Role of indehiscent pericarp in formation of soil seed bank in five cold desert Brassicaceae species
Role of indehiscent pericarp in formation of soil seed bank in five cold desert Brassicaceae species
复制标题
寒漠五种十字花科植物不裂果皮对土壤种子库形成的作用
DOI：
10.1007/s11258-017-0760-8
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发表时间：
2017-10-01
期刊：
影响因子：
1.7
通讯作者：
Baskin, Jerry M.
中科院分区：
文献类型：
--
作者：
Lu, Juan J.;Tan, Dun Y.;Baskin, Jerry M.
The dispersal and germination unit of some Brassicaceae species is the fruit, and we hypothesized that it could affect germination phenology and promote formation of a soil seed bank. We determined the effects of the indehiscent pericarp on germination and longevity of buried seeds of five Brassicaceae species native to cold deserts of central Asia. Germination phenology (seedling emergence) was monitored for intact dispersal units and isolated seeds ofChorispora sibirica,Goldbachia laevigata,Spirorrhynchus sabulosus,Tauscheria lasiocarpa(annuals), andSterigmostemum fuhaiense(perennial) at natural temperatures in watered and non-watered (natural precipitation) soil. Intact dispersal units and isolated seeds were buried under natural conditions and exhumed at regular intervals for 35 months to monitor germination, viability and moisture content of isolated seeds, seeds in dispersal units, and seeds removed from dispersal units after burial. Isolated seeds ofGoldbachia,Spirorrhynchus, andTauscheriagerminated only the first autumn and those ofChorisporaandSterigmostemumthe first autumn and first spring, with higher germination percentages in all species in watered than in non-watered soil. A high percentage of seeds in buried dispersal units ofChorispora,Goldbachia, andSterigmostemumwas viable after 35 months, and seeds exhibited a 6-month dormancy cycle, being non-dormant only in autumn and spring. Seeds in buried dispersal units ofSpirorrhynchusandTauscheriagerminated when exhumed in the first spring, but all non-germinated seeds were dead after 1 year. Thus, the presence of the pericarp allowsChorispora,Goldbachia, andSterigmostemumto form a persistent seed bank but notSpirorrhynchusandTauscheria.
