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Publication Type J
Authors Rogers, M. E., T. D. Colmer, K. Frost, D. Henry, D. Cornwall, E. Hulm, S. Hughes, P. G. H. Nichols and A. D. Craig
Title The influence of NaCl salinity and hypoxia on aspects of growth in Trifolium species
Source Crop & Pasture Science
Language English
Author Keywords salt tolerance clovers anaerobic conditions digestibility Na+/K+ ratio pasture legumes salt tolerance southern australia pasture legumes oxygen movement subterraneum l root porosity plants germination persistence melilotus Agriculture
Abstract The effects of salinity and hypoxia on growth, nutritive value, and ion relations were evaluated in 38 species of Trifolium and 3 check legume species (Trifolium fragiferum, Trifolium michelianum, and Medicago sativa) under glasshouse conditions, with the aim of identifying species that may be suitable for saline and/or waterlogged conditions. In the. first set of experiments, plants were grown hydroponically at four NaCl concentrations (0, 40, 80, and 160 mM NaCl) and harvested after exposure to these treatments for 4 weeks. NaCl concentrations up to 160 mM reduced dry matter production in most species; however, there were differences in salt tolerance among species, with T. argutum, T. diffusum, T. hybridum, and T. ornithopodioides performing well under the saline conditions (dry matter production was reduced by less than 20%). Concentrations of Na+ and Cl- in the shoots increased with increasing salinity levels, and species again differed in their capacity to limit the uptake of these ions. Dry matter digestibility at 0 mM ranged from 49.8% (T. palaestinum) to 74.0% (T. vesiculosum) and decreased with increasing NaCl concentrations. A second set of experiments evaluated the tolerance of Trifolium species to hypoxic conditions in the glasshouse. Shoot growth, and to a lesser extent root growth, were reduced in all Trifolium species when plants were exposed to stagnant, non-aerated conditions for 28 days, but T. michelianum, T. resupinatum, T. squamosum, T. nigrescens, T. ornithopodioides, T. salmoneum, and T. fragiferum were the least affected species. All species acclimated to the oxygen-depleted conditions by increasing the gas-filled porosity in the roots. This study has provided information that will assist in the identification of forage species for saline and/or waterlogged areas.
Author Address [Rogers, M. E.; Colmer, T. D.; Frost, K.; Henry, D.; Cornwall, D.; Hulm, E.; Hughes, S.; Nichols, P. G. H.; Craig, A. D.] Univ Western Australia, Cooperat Res Ctr Future Farm Ind, Crawley, WA 6009, Australia. [Rogers, M. E.; Cornwall, D.] Dept Primary Ind Victoria, Tatura, Vic 3616, Australia. [Colmer, T. D.; Frost, K.; Nichols, P. G. H.] Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia. [Henry, D.; Hulm, E.] CSIRO Livestock Ind, Wembley, WA 6913, Australia. [Hughes, S.] S Australian Res & Dev Inst, Adelaide, SA 5001, Australia. [Nichols, P. G. H.] Dept Agr & Food Western Australia, Bentley, WA 6983, Australia. [Craig, A. D.] Struan Agr Ctr, S Australian Res & Dev Inst, Naracoorte, SA 5271, Australia. Rogers, ME (reprint author), Univ Western Australia, Cooperat Res Ctr Future Farm Ind, 35 Stirling Highway, Crawley, WA 6009, Australia. MaryJane.Rogers@dpi.vic.gov.au
ISSN 1836-0947
ISBN 1836-0947
29-Character Source Abbreviation Crop Pasture Sci.
Year Published 2009
Volume 60
Issue 1
Beginning Page 71-82
Digital Object Identifier (DOI) 10.1071/cp08123
Unique Article Identifier WOS:000263616400008
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