Author:
Gucci Riccardo,Moing Annick,Gravano Elisabetta,Gaudillère Jean Pierre
Abstract
Changes in photosynthetic carbon partitioning were determined, during
14CO2 pulse-chase experiments, in
fully-expanded leaves of olive (Olea europaea L. cv.
Frantoio) plants treated in containers with 100 mM NaCl for 5 weeks and
compared with partitioning in leaves of untreated plants. Salt stress caused
an increase in the radioactivity partitioned into mannitol and a decrease of
that recovered as glucose. The radioactivity in sucrose was significantly
reduced in salt-treated plants after 19.5 min of chase. There was no
difference between the two treatments in the radioactivity found in fructose
and galactose, whereas a significant decrease in the radioactivity found in
stachyose and raffinose of salt-treated leaves was observed after 19.5 min
chase. The radioactivity incorporated into starch was 11 and 16% of the
total in control and salt-treated leaves respectively. There were no
significant differences in the leaf pools of soluble carbohydrates over the
chase period, except for mannitol which increased in the leaf tissue of
salt-treated plants. Over the course of the diurnal period, and under high
irradiance conditions, the leaf mannitol content increased more markedly in
salt-treated plants than in the controls. In contrast, contents of other
nonstructural carbohydrates were not affected by the 100 mM NaCl treatment.
Subject
Plant Science,Agronomy and Crop Science
Cited by
34 articles.
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