Article Abstract:
Plants are known to synthesize many steroidal compounds, and physiologists have been able to rigorously study the effects of brassinolsteroids (BRs) on plant growth and development. However plant scientists have been slow in accepting that BRs are true hormones, until the discovery of mutants in Arabidopsis that are defective in the synthesis of brassinolide, and the cloning of a BRI1 gene. Pharmacokinetic studies will be required for future research into the role of BRI1 in brassinolide signalling.
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Article Abstract:
The Arabidopsis mutant labeled responsive-to-antagonist1 (ran1) was observed to develop ethylene phenotypes when treated with potent receptor antagonist trans-cyclooctene. When ran1 was cloned, it was found that a protein similar to copper-transporting P-type adenosine triphosphatases that includes the human Menkes/ Wilson proteins and yeast Ccc2p was encoded. Furthermore, results of genetic epistasis studies revealed that ran1 is essential for ethylene signalling in Arabidopsis.
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Article Abstract:
The ethylene response gene HOOKLESS1 (HLS1) controls differential cell growth in the Arabidopsis hypocotyl by regulating auxin activity. Moreover, HLS1 is required for the normal transport of the cell growth regulator auxin and may also promote elongation in the hypocotyl and root as well as limit expansion of cells in the cotyledons by controlling the distribution of auxin in the seedling.
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