Effects of NaCl stress on growth and water relations of different rice (Oryza sativa L.) varieties
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Abstract
LP-7, J-104, LP-9 and Perla were germinated in trays with
vermiculite and distilled water. Once the radicle was emitted,
Hoagland nutritive solution was added, where they stayed for
13 days; later on, they were acclimatized in trays of nine liters
of capacity during seven days under hidroponic conditions.
Starting from that period, the following experimental variants
were applied: a control treatment where NaCl was not added to
the nutritive solution, as well as variants with 75 and 150 mM
of NaCl during 14 days. For the development of the work, a
growth chamber was used, establishing a photoperiod of 14
hours light, the temperature varied between 25/18oC day/night,
the relative humidity kept at 60/70 % day/night and the maximum
illumination was 380 mmoles.m-2.s-1. Evaluations were carried out
when beginning saline treatments and finishing the period of
treatment 14 days after applying the stress. Every moment,
root system biomass, shoot and leaf surface were evaluated in
three groups of three plants from each experimental variant.
When the experiment finished, the number of tillers, leaf water
potential, osmotic potential and osmotic potential at full turgor
of root and shoot were measured whereas the pressure
potential was estimated on leaf water and osmotic potentials;
the stomatal conductance and transpiration were also measured
at maximum illumination. With biomass data, the relative growth
rate, net assimilation rate and resistance index of salinity were
calculated. From the analysis of data obtained, differences
were recorded on the varietal behavior when exposed to saline
stress, not only concerning growth, but water relations,
through which it was appreciated that most varieties adopted
the osmotic adjustment mechanism, as a form to reduce
adverse stress effects
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