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Publication Type J
Authors Cao, D. C., C. C. Baskin, J. M. Baskin, F. Yang and Z. Y. Huang
Title Comparison of germination and seed bank dynamics of dimorphic seeds of the cold desert halophyte Suaeda corniculata subsp mongolica
Source Annals of Botany
Author Keywords Dormancy halophyte seeds salinity seed germination seedling recruitment seed bank dynamics Suaeda corniculata crepis-sancta asteraceae spinosa l campd achene dimorphism seasonal-changes dormancy cycles salinity chenopodiaceae temperature dispersal growth
Abstract Differences in dormancy and germination requirements have been documented in heteromorphic seeds of many species, but it is unknown how this difference contributes to maintenance and regeneration of populations. The primary aim of this study was to compare the seed bank dynamics, including dormancy cycling, of the two seed morphs (black and brown) of the cold desert halophyte Suaeda corniculata and, if differences were found, to determine their influence on regeneration of the species. Seeds of the two seed morphs were buried, exhumed and tested monthly for 24 months over a range of temperatures and salinities, and germination recovery and viability were determined after exposure to salinity and water stress. Seedling emergence and dynamics of the soil seed bank were also investigated for the two morphs. Black seeds had an annual dormancy/non-dormancy cycle, while brown seeds, which were non-dormant at maturity, remained non-dormant. Black seeds also exhibited an annual cycle in sensitivity of germination to salinity. Seedlings derived from black seeds emerged in July and August and those from brown seeds in May. Seedlings were recruited from 26 of the black seeds and from 28 of the brown seeds in the soil, and only 05 and 04 of the total number of black and brown seeds in the soil, respectively, gave rise to seedlings that survived to produce seeds. Salinity and water stress induced dormancy in black seeds and decreased viability of brown seeds. Brown seeds formed only a transient soil seed bank and black seeds a persistent seed bank. The presence of a dormancy cycle in black but not in brown seeds of S. corniculata and differences in germination requirements of the two morphs cause them to differ in their germination dynamics. The study contributes to our limited knowledge of dormancy cycling and seed bank formation in species producing heteromorphic seeds.
Author Address [Cao, Dechang; Yang, Fan; Huang, Zhenying] Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China. [Cao, Dechang; Yang, Fan] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China. [Baskin, Carol C.; Baskin, Jerry M.] Univ Kentucky, Dept Biol, Lexington, KY 40506 USA. [Baskin, Carol C.] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40546 USA. Huang, ZY (reprint author), Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China. zhenying@ibcas.ac.cn
ISSN 0305-7364
ISBN 0305-7364
29-Character Source Abbreviation Ann. Bot.
Publication Date Dec
Year Published 2012
Volume 110
Issue 8
Beginning Page 1545-1558
Digital Object Identifier (DOI) 10.1093/aob/mcs205
Unique Article Identifier WOS:000311643900004
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