Brassinosteroids and its analogs enhance the seedling growth of two rice (Oryza sativa L.) genotypes under saline conditions
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Abstract
are required to plant growth and development and they are,
also, implied in plant response to abiotic stress. The central
objective of this paper was to evaluate if rice seed treatment
with different concentrations of a natural brassinosteroid and
an spirostane analog reduces the impact of salt stress in the
seedling growth. Two experiments were performed, at the first
one, a salt sensitive variety, J-104 was used and at the second
one, a tolerant genotype, Ginés, was employed. In both
experiments, the seeds were treated, for 24 hours, with different
concentrations (0; 0,01; 0,1 y 1,0 ?mol.L-1) of a natural
brassinosteroid, 24-epibrassinolide, and an spirostanic analog
of brassinosteroids, 25(R)-3?,5?, dihydroxy-5?-spirostan-6-one,
which formulation is known as BIOBRAS-16. After germination,
the seedlings were placed in pots containing Hoagland diluted
nutritive solution with the addition or not of 100 mmol.L-1
sodium chloride. In the first experiment, the seedlings remaining
during eleven days in a growth room with 12 h photoperiod
and 25±2oC temperature; while in the second one, the seedlings
were grown for thirteen days at a 28±2oC temperature. At the
end of the experiments, root and shoot length and dry mass
were evaluated. Results showed that 24-epibrassinolide and
BIOBRAS-16 were able to reverse partially the seedling growth
inhibition of both rice genotypes induced by the presence of
sodium chloride; being the more effective treatments in the
tolerant variety.
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