Brassinosteroid analogs partially revert salt stress impact on the early seedling growth of two rice (Oryza sativa L.) genotypes
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Abstract
spirostane brassinosteroid analogs known as BIOBRAS-6
(BB6) and BIOBRAS-16 (B16) on seedling growth of two
rice varieties under saline conditions was studied in the
present paper. Seeds of J-104 and INCA LP-7 varieties were
dipped in water, 100 mM NaCl or 100 mM NaCl supplemented
with different concentrations (1, 0.5, 0.05 and 0.005 mg.L-1) of
B16 or BB6 for 24 hours. Later, seeds were placed in Petri
dishes with filter paper dampened with distilled water for
germination and maintained in a growth chamber at darkness
during 48 hours. Germinated seeds were transferred to pots
containing the different assayed solutions and placed in a
growth chamber with 16 hour- photoperiod and 25±2oC
temperature for seven days. At the end of the experiment, shoot
and root lengths as well as fresh and dry weights were
evaluated. Results showed that, in general, 0.005 mg.L-1 of
B16 was the most effective treatment to revert adverse effects
induced by salinity in both varieties, whereas the response to
BB6 depended on the variety.
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