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Tolerance of submerged germinating rice to 50–200 m M NaCl in aerated solution
Author(s) -
Kurniasih Budiastuti,
Greenway Hank,
Colmer Timothy David
Publication year - 2013
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/ppl.12029
Subject(s) - turgor pressure , shoot , oryza sativa , germination , aeration , salinity , chemistry , osmotic pressure , horticulture , sowing , sodium , zoology , botany , biology , biochemistry , ecology , organic chemistry , gene
This paper concerns tolerance to 50–200 m M 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 m M NaCl , albeit with severe growth restrictions. After return to 0.3 m M NaCl , growth increased, indicating that even at 200 m M NaCl there was no irreparable injury. Osmotic adjustment was achieved by using Na + and Cl – as the major osmotica. At 200 m M NaCl commenced at sowing, the shoot Na + and Cl – concentrations between 50–110 h were about 210 and 260 m M , 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 m M NaCl , the contributions from ions to π sap were 81–92% in roots and 62–74% in shoots. The assessed turgor pressures at 200 m M NaCl were 0.33 MPa in shoots and 0.15 MPa in roots, compared to 0.62 and 0.43 MPa at 0.3 m M NaCl . In the General Discussion section, 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.