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Publication Type J
Authors Redondo-Gomez, S., E. Mateos-Naranjo, J. Cambrolle, T. Luque, M. E. Figueroa and A. J. Davy
Title Carry-over of differential salt tolerance in plants grown from dimorphic seeds of Suaeda splendens
Source Annals of Botany
Author Keywords chlorophyll fluorescence; germination; growth rate; halophyte; photosynthesis; photosystem II; salt tolerance; seed dimorphism; seed viability; Suaeda splendens PHOTOSYNTHETIC ELECTRON-TRANSPORT; CHLOROPHYLL FLUORESCENCE; SALINE CONDITIONS; ATRIPLEX-TRIANGULARIS; GERMINATION; HALOPHYTE; TEMPERATURE; STRESS; FRUTICOSA; RESPONSES
Abstract Background and Aims Halophytic species often show seed dimorphism, where seed morphs produced by a single individual may differ in germination characteristics. Particular morphs are adapted to different windows of opportunity for germination in the seasonally fluctuating and heterogeneous salt-marsh environment. The possibility that plants derived from the two morphs may also differ physiologically has not been investigated previously. Methods Experiments were designed to investigate the germination characteristics of black and brown seed morphs of Suaeda splendens, an annual, C-4 shrub of non-tidal, saline steppes. The resulting seedlings were transferred to hydroponic culture to investigate their growth and photosynthetic (PSII photochemistry and gas exchange) responses to salinity. Key Results Black seeds germinated at low salinity but were particularly sensitive to increasing salt concentrations, and strongly inhibited by light. Brown seeds were unaffected by light, able to germinate at higher salinities and generally germinated more rapidly. Ungerminated black seeds maintained viability for longer than brown ones, particularly at high salinity. Seedlings derived from both seed morphs grew well at high salinity (400 mol m(-3) NaCl). However, seedlings derived from brown seeds performed poorly at low salinity, as reflected in relative growth rate, numbers of branches produced, F-v/F-m and net rate of CO2 assimilation. Conclusions The seeds most likely to germinate at high salinity in the Mediterranean summer (brown ones) retain a requirement for higher salinity as seedlings that might be of adaptive value. On the other hand, black seeds, which are likely to delay germination until lower salinity prevails, produce seedlings that are less sensitive to salinity. It is not clear why performance at low salinity, later in the life cycle, might have been sacrificed by the brown seeds, to achieve higher fitness at the germination stage under high salinity. Analyses of adaptive syndromes associated with seed dimorphism may need to take account of differences over the entire life cycle, rather than just at the germination stage.
Author Address [Redondo-Gomez, Susana; Mateos-Naranjo, Enrique; Cambrolle, Jesus; Luque, Teresa; Figueroa, M. Enrique] Univ Seville, Fac Biol, Dept Biol Vegetal & Ecol, E-41080 Seville, Spain. [Davy, Anthony J.] Univ E Anglia, Sch Biol Sci, Ctr Ecol Evolut & Conservat, Norwich NR4 7TJ, Norfolk, England. Redondo-Gomez, S, Univ Seville, Fac Biol, Dept Biol Vegetal & Ecol, Apartado 1095, E-41080 Seville, Spain. susana@us.es
ISSN 0305-7364
ISBN 0305-7364
29-Character Source Abbreviation Ann. Bot.
Publication Date Jul
Year Published 2008
Volume 102
Issue 1
Beginning Page 103-112
Digital Object Identifier (DOI) 10.1093/aob/mcn069
Unique Article Identifier ISI:000256976900012
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