THE EFFECT OF SALTY STRESS IN THE PRIMARY GROWTH STAGE OF COTTON PLANT

Document Type : Research articles.

Author

Agriculture Faculty, University of Al-Fourat

Abstract

This research aimed to study the differences of physiological reactions of
the developing cotton seedlings grown in pots under salinity (NaCI or Na2S04)
salt.
The experiment showed that cotton seeds have the ability to absorb the
water from the normal and salinie soils. During the stage of seeds welling, but
with more attributed with significant their differences duration in the
imbibition's media and specific ion effects of (NaCI, Na2S04), where the speed
and the amount of water absorption had increased all over, with in creasing the
time. This parameter was obvious with a great vitality in its first days with the
control, meanwhile an opposite trend was noticed with the effect of (NaCI).
On the other hand, Na2S04 showed a contradictory behavior of the two cases
above, denoting a relatively high amount of the activity in accordance to the
time.
This obviously affected inflation of the seeds, with significant differences
in the common germination and its percentage which reached (86.27 and 55
%) respectively. Whereas, the germination energy reduced to 1/3 and 2/3 less
than the samples under the effect of applied salts whose ions showed a
relatively passive reaction on the primary developing stage of the seedlings,
and consequently the growth slowed down.
Salinity has caused obvious changes appeared in the weakness of the
growth parameters (height, of seedlings spreading and the wet and dry
seedlings' mass, leafy & root assembly, and cotyledons leaves area) as related
to the salty ions which limited the dwarfing degree of the seedlings and broke
the farming area into sections.
The seedlings, the green mass and the roots showed an obvious respones
in reacting the salinity which revealed pronounced reductions of the dry mass
as compared to the wet one as well as the stem growth than that of the roots.
That was considered the main reason for seedlings' inactivity and growth
perfectly due to the effect of specific ions. At the same time, the relatively
salinity tolerance (RST) of the seedlings, the green mass, and the roots showed
noticeable reductions under the effect of salinity, especially (NaCI) as
compared to (Na2S04). So, the devaluation of RST itself was more related to
the reduction in the green mass.

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