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Relationship between leaf water spin‐lattice relaxation time and water relation parameters in three wheat cultivars
Author(s) -
NAGARAJAN S.,
CHAHAL S. S.,
GAMBHIR P. N.,
TIWARI P. N.
Publication year - 1993
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1993.tb00848.x
Subject(s) - cultivar , water content , turgor pressure , sowing , moisture , drought tolerance , horticulture , agronomy , mathematics , botany , chemistry , biology , geotechnical engineering , organic chemistry , engineering
Pot culture studies were conducted using two drought‐tolerant and one susceptible cultivar of wheat ( Triticum aestivum L.) under three different moisture regimes. Proton spin‐lattice relaxation time, T 1 , leaf water content, LWC, leaf water potential, Ψ, solute potential, Ψ s and turgor potential, Ψ p were measured from 45 to 75 d after sowing at weekly intervals. The three cultivars did not differ significantly in their values of LWC, leaf water potential, and their components in the stressed and unstressed plants; but they did differ significantly in their T 1 values both under stressed and unstressed conditions on all days of measurement, with the drought tolerant cultivars having a higher T 1 compared to the susceptible cultivar. This suggests that leaf water T 1 is a better parameter for describing plant water status than the traditional water relation indices. The relation between Ψ and T 1 was logarithmic, indicating the similarity between T 1 and water activity of the cellular water.