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MEMBRANE THERMOSTABILITY AND NITRATE REDUCTASE ACTIVITY IN RELATION TO WATER STRESS TOLERANCE OF YOUNG SUGAR‐CANE PLANTS
Author(s) -
VENKATARAMANA S.,
NAIDU K. MOHAN,
SINGH SUDAMA
Publication year - 1987
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1987.tb00185.x
Subject(s) - thermostability , nitrate reductase , malondialdehyde , chemistry , lipid peroxidation , sugar , cane , horticulture , botany , biochemistry , biology , oxidative stress , enzyme
S ummary An assessment of tolerance to water stress based upon measurements of cellular membrane thermostability and in vivo nitrate reductase activity (NRA) was made using young leaves of sugar‐cane ( Saccharum officinarum L. commercial hybrids, Co 419, Co 740 and Co 1148) subjected to stress (51 to 61 d old) and subsequent hydration. An average reduction in leaf water potential (Ψ L ) from −0.97 to −1.91 MPa was associated with a decrease in NRA from 2.68 to 1.13 Ψmol g f. wt −1 h −1 , and an increase of the membrane injury from 30.8 to 70.9%. A highly significant positive correlation between Ψ L and NRA and a negative correlation between Ψ L and membrane injury were demonstrated. As Ψ L declined, the concentration of malondialdehyde, a lipid peroxidation product, doubled. Following rehydration, at 63 d, increases in Ψ L and NRA were higher than those of membrane thermostability and malondialdehyde concentration.