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Tolerance of submerged germinating rice to 50-200 mM NaCl in aerated solution.
MedLine Citation:
PMID:  23379468     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This paper concerns tolerance to 50-200 mM NaCl of submerged rice (Oryza sativa cv. Amaroo) during germination and the first 138-186 h of development, in aerated solution. Rice was able to germinate and the seedlings even tolerated exposure to 200 mM NaCl, albeit with severe growth restrictions. After return to 0.3 mM NaCl, growth increased, indicating that even at 200 mM NaCl there was no irreparable injury. Osmotic adjustment was achieved by using Na(+) and Cl(-) as the major osmotica. At 200 mM NaCl commenced at sowing, the shoot Na(+) and Cl(-) concentrations between 50-110 h were about 210 and 260 mM, respectively; i.e. above the external concentration. Thus, there was a high tissue tolerance to NaCl. The internal concentrations declined subsequently, concurrent with a decline in growth. At 50-200 mM NaCl, the contributions from ions to π(sap) were 81-92% in roots and 62-74% in shoots. The assessed turgor pressures at 200 mM NaCl were 0.33 MPa in shoots and 0.15 MPa in roots, compared to 0.62 and 0.43 MPa at 0.3 mM NaCl. In the general discussion, we compare the different responses of submerged seedlings to the responses of transpiring rice plants, reported in the literature, and suggest that the submerged system is useful to evaluate effects of NaCl on turgor pressure and particularly to establish whether there are specific effects of Na(+) and Cl(-) in tissues.
Authors:
Budiastuti Kurniasih; Hank Greenway; Timothy David Colmer
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-4
Journal Detail:
Title:  Physiologia plantarum     Volume:  -     ISSN:  1399-3054     ISO Abbreviation:  Physiol Plant     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1256322     Medline TA:  Physiol Plant     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 Scandinavian Plant Physiology Society, ISSN 0031-9317.
Affiliation:
School of Plant Biology (MO84), Institute of Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Western Australia, Australia.
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