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Effects of salinity and phosphate on ion distribution in lupin leaflets
Author(s) -
Treeby Michael T.,
Steveninck Reinhard F. M.
Publication year - 1988
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/j.1399-3054.1988.tb00604.x
Subject(s) - vacuole , phosphate , phosphorus , salinity , salt (chemistry) , nutrient , botany , biology , chemistry , horticulture , biochemistry , cytoplasm , ecology , organic chemistry
Lupin ( Lupinus luteus L. cv. Weiko III) were grown in nutrient solution over a range of inorganic phosphate (P i ) concentrations, with or without 50 m M NaCl. Plants with high P i (2 m M ) and salt showed progressive leaf necrosis and had higher concentrations of total phosphate than plants grown with high P i alone. Most of the extra total phosphate in salt treated plants was in the P i form. P i supply did not influence Na + , K + or Cl − concentrations in epidermal vacuoles or mesophyll cells. However, epidermal vacuoles accumulated more monovalent cations (Na + and K + ) than Cl − , and in vacuoles of plants grown with 0.1 m M P i additional P i was accumulated, possibly to maintain charge balance. Plants grown with 2 m M P i did not accumulate additional P i in epidermal vacuoles, but showed higher phosphorus levels in cell walls. It is suggested that at moderate phosphorus concentrations P i plays a role in epidermal osmotic adjustment, possibly explaining the beneficial role of additional phosphorus on salt stressed plants. At high P i supply with salt, P i does not contribute to osmotic adjustment and instead accumulates in cell walls. However, the cause of leaf damage under conditions of high phosphorus supply and salinity is still not entirely clear.