Inducing adaptative responses in rice (Oryza sativa L.) crop under moderate salinity conditions
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Abstract
tolerance of rice plants by means of osmo/haloconditioning
treatments, inducing its natural capacity to get adapted under
adverse conditions and to be considered as an acquired
tolerance. Two trials were conducted with J-104 cv. seedlings.
The first one proved method viability, besides evaluating crop
growth and biomass partitioning in young plants. The second
one recorded the effect of the same adaptative treatments on
plant response under salinity conditions (soil electrical
conductivity EC=4.8 m.s.cm-1 considered as moderately saline).
After 105 days of transplanting, stem length, leaf number as
well as biomass partitioning of the aerial part and root were
measured in 10 plants per treatment. Yield (panicle number per m2,
1000-grain weight and grams per m2) was evaluated in 20 plants
per treatment. Results suggest these treatments are capable of
inducing certain homeostatic stability in plants to develop
and yield adequately under a moderately saline medium; thus,
it would be interesting to prove through studying the
physiological crop responses, since the adaptation to saline
medium, although by purely osmotic pre-treatments, involves
a greater salt ion accumulation in young leaf tissues, which
supposes a much more efficient osmotic adjustment and a
greater salt tolerance.
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