Premium
Protective role of exogenous polyamines on salinity‐stressed rice ( Oryza sativa ) plants
Author(s) -
Chattopadhayay Manas Kumar,
Tiwari Budhi Sagar,
Chattopadhyay Gouri,
Bose Anindita,
Sengupta Dibyendu Narayan,
Ghosh Bharati
Publication year - 2002
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 - 10.1034/j.1399-3054.2002.1160208.x
Subject(s) - spermidine , oryza sativa , spermine , salinity , shoot , photosynthesis , chlorophyll , botany , chloroplast , biology , chlorophyll fluorescence , chemistry , horticulture , enzyme , biochemistry , gene , ecology
Salt‐tolerant Pokkali rice plants accumulate higher polyamines (PAs) such as spermidine (Spd) and spermine (Spm) in response to salinity stress, while the sensitive cultivar M ‐1–48 is unable to maintain high titres of these PAs under similar conditions. The effects of the triamine Spd and the tetramine Spm on physiological and biochemical changes in 12‐day‐old rice seedlings were investigated during salinity stress to determine whether they could protect the sensitive plants from stress effects. At physiological concentrations Spd and Spm significantly prevented the leakage of electrolytes and amino acids from roots and shoots induced by salinity stress. To different degrees they also prevented chlorophyll loss, inhibition of photochemical reactions of photosynthesis as well as downregulation of chloroplast‐encoded genes like psbA , psbB , psbE and rbcL , indicating a positive correlation between salt tolerance and accumulation of higher PAs in rice. The inhibitory effect of salinity stress and its reversal by exogenous PAs were more pronounced in the salt‐sensitive M ‐1–48 plants than in the tolerant Pokkali plants.