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Articles by T. Stuchbury
Total Records ( 2 ) for T. Stuchbury
  M.Z. Alam , T. Stuchbury and R.E.L. Naylor
  The effect of reduced osmotic potentials on germination and early seedling growth of four rice cultivars differing in salt tolerance were studied using iso-osmotic solutions (0, -0.232, -0.457, -0.677, -0.906 and -1.129 MPa) of NaCl and polyethylene glycol (PEG 4000). Seed germination and early seedling growth were assessed using four replicates of 25 seeds at 21±10C in the dark using paper towel method. Onset of germination, germination rate and seedling growth, all declined with increasing concentrations of both NaCl and PEG, the former being more inhibitory. Germination and growth processes were mainly affected at and above -0.457 MPa osmotic potential in both NaCl and PEG. Rice cultivars differed greatly in their tolerance to salt and water stress. However, the differences were well pronounced in NaCl but less so in PEG. The imposition of water stress by PEG for 9 days did not permanently inhibit germination or induce dormancy. However, salt stress appeared to be lethal than the equivalent osmotic potentials of PEG. Salt tolerant cultivars (V2 and BR23) performed consistently better under salt stress and consistently poor under osmotic stress compared with salt sensitive cultivars (V1 and IR8). These results suggested that the salt tolerance of rice cultivars is probably determined by their ability to withstand excessive Na+ and Cl‾ ions rather than their ability of water stress tolerance.
  M.Z. Alam , T. Stuchbury , R.E.L. Naylor and M.A. Rashid
  Water uptake and pattern of germination of two rice cultivars differing in seed size were determined in iso-osmotic solutions of NaCl and polyethelene glycol, different concentrations of CaCl2 and combinations of NaCl and CaCl2. The results demonstrated that full imbibition of rice seeds occurred at around 30% moisture content (mc) and the critical mc for germination was around 25-30%. Although rates of water uptake in rice seeds were reduced with increasing salinity, rice seeds attained full imbibition by 48 h up to 150 mM salinity and reached at least critical mc by 72 h up to 250 mM salinity. Water uptakes in NaCl solutions were greater than in iso-osmotic solutions of PEG and rice seeds did not attain even critical mc in PEG solutions lower than -0.232 MPa even after 72 h. When Ca was added in combination with NaCl, water uptake in rice seeds increased. Water uptake in smaller seed was less during the first 12 h of imbibition than larger seeds. However, equilibrium mc was attained within 48 h in both large and small seed. The onset of germination declined with increasing concentrations of NaCl and in iso-osmotic solutions of PEG, particularly below-0.457 MPa osmotic potential. Large and small grain rice seed differed significantly in their response to salt and osmotic stress. Supplemental Ca (3 to 9 mM) significantly increased germination percentage compared to no Ca salt stress. Three mM Ca completely offset the deleterious effects of 150 mM NaCl and 6 mM Ca partially offset the deleterious effects of 225 mM NaCl on rice seed germination. Nine mM Ca significantly increased germination in large seed cultivar but not in the small grain cultivar compared to 6 mM Ca.
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