ETHYLENE PRODUCTION BY LEAVES OF RICE (ORYZA-SATIVA L) IN RELATION TOSALINITY TOLERANCE AND EXOGENOUS PUTRESCINE APPLICATION

Citation
S. Lutts et al., ETHYLENE PRODUCTION BY LEAVES OF RICE (ORYZA-SATIVA L) IN RELATION TOSALINITY TOLERANCE AND EXOGENOUS PUTRESCINE APPLICATION, PLANT SCI, 116(1), 1996, pp. 15-25
Citations number
30
Categorie Soggetti
Plant Sciences
Journal title
PLANT SCIENCE
ISSN journal
01689452 → ACNP
Volume
116
Issue
1
Year of publication
1996
Pages
15 - 25
Database
ISI
SICI code
0168-9452(1996)116:1<15:EPBLOR>2.0.ZU;2-V
Abstract
The effects of salt stress on the production of ethylene in leaves of five rice cultivars differing in salinity tolerance were investigated after 15 and 30 days of stress exposure in plants sprayed every 2 days with deionised water or putrescine 100 mu M. NaCl induced an increase in ethylene synthesis which was higher in salt-tolerant than in salt- sensitive cultivars (cvs.), Salt-stress also induced an increase in 1- aminocyclopropane-1-carboxylic acid (ACC) content which was larger in salt-tolerant cvs, whereas a decrease in ACC conversion to ethylene su ggested a reduction in ACC oxidase activity. Putrescine increased the growth and the leaf tissue viability (as indicated by the reduction of 2,3,5-triphenyltetrazolium chloride (TTC) to formazan) of salt-treate d plants in all cvs. This positive effect was associated with an incre ase in ethylene biosynthesis through an increase in ACC content and a suppression of NaCl-induced inhibition of ACC conversion to ethylene. These data suggest that putrescine could be involved in salinity toler ance in rice.