Influence of 24-epibrassinolide and a brassinosteroid spirostanic analog on seedling growth of two rice (Oryza sativa L.) varieties in a saline medium
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Abstract
of plants, causing a quick growth reduction. Brassinosteroids
are involved in plant tolerance to this kind of stress. This
paper presents the effect of treatments with a natural
brassinosteroid (24-epibrassinolide, EBR) and a
brassinosteroid spirostanic analog (MH5) on seedling growth
of two rice varieties in a culture medium supplemented with or
without NaCl. Seeds from J-104 and INCA LP-7 germinated in
a MS medium supplemented with EBR or MH5 for seven days.
Seedlings were later transferred to a single MS medium or
supplemented with 100 or 150 mM NaCl for 12 days. The
presence of NaCl in the culture medium proved to differently
affect seedling growth of those varieties and, even though
treatments with EBR were capable of significantly promoting
the cumulative fresh weight rate of leaves from INCA LP-7
seedlings grown in a medium supplemented with 100 mM NaCl
and of roots from J-104 seedlings grown in a saline medium,
absolute values of these indicators did not differ from the
ones of the control treatment.
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