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Physiological esponses of P. formosanum, F. formosana and M. kusanoi to Salty Smog Stress
|關鍵字:||Salty Smog Stress;鹽霧||出版社:||植物學系||摘要:||
Native seedlings of Palaquium formosanum, Fraxinus formosana and
Machiluskusanoi were grown in a greenhouse . The maximum soil
water contents were controlled to be 50.4%, 69.6% and 88.8% with
automatic watering system using polyvinylformal strips .
Periodically, artificial sea water was sprayed evenly on the
leaves. Several physiological responses of these seedlings to
salty smog was examined. The results showed that the growth of
all seedlings were inhibited by salty smog treatment. The
extent of growth inhibition was the highest in F. formosana and
the lowest in P. formosanum. The degree of inhibition in the
measurements of leaf water content, water potential, osmotic
potential, turgor pressure and absorption of water was also
the highest in F. formosana and the lowest in P. formosanum.
During salty smog treatment, the leaf water potential, water
content and absorption water of of F. formosana decreased
continously and was never recovered, whereas less severe
effects were found in P. formosanum and M.kusanoi . In analysis
of leaf stomatal conductance and transpiration,we also found
that all followed the same trends as the most serious inF.
formosana and the slightest in P. formosanum. As for
photosynthesis, chlorophyll contents in all seedlings were
decreased by salty smog treatment and the degree of decrease was
the highest in F. formosana during treatment. The activity of
Rubisco was also inhibited significantly in F. formosana. These
observations were similar to those of M. kusanoi but the effect
was less severe. There were no difference of Rubisco activity
between control and salty-smog treatment in P. formosanum. These
results showed that P. formosanum has higher tolerance to salty
smog. Although M. kusanoi are more sensitive to salty smog, it
still can tolerate for short term treatment. And F. formosana is
most affected by salty smog treatment. As for osmotic
regulation, all three species were accumulated soluble sugars
and proline. Betaine was also found to accumulate in P.
formosanum. These results showed that P. formosanum can
accumulate certain osmolytes for osmotic adjustment and protein
under environmental stresses. P. formosanum can also efficiently
regulate the content of carbon and nitrogen in order to
acclimate salty smog. F. formosana is sensitive to salty smog
and the expression of physiological responses are inhibited, and
growth is decreased during stress. M. kusanoi has mild-tolerance
to salty smog in short term exposure to salty smog, but still
develops inhibitory symptoms as stress persisted.
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