Hormonal regulation of beta1,3-glucanase messenger RNA levels in cultured tobacco tissues.
We describe the isolation of a cDNA clone of beta1,3-glucanase mRNA from Nicotiana tabacum L. cv. ;Havana 425' and its use to measure the kinetics of mRNA accumulation in cultured tobacco tissues treated with the plant hormones auxin and cytokinin. Northern blot analysis showed that the tissues contain a single 1.6 kb-sized beta1,3-glucanase mRNA. The levels of beta1,3-glucanase and beta1,3-glucanase mRNA increase by up to seven- and 20-fold, respectively, over a 7-day period in tissues subcultured on hormone-free medium and medium containing auxin or cytokinin added separately. Over the same interval of time, the content of both the enzyme and its mRNA remains at a constant low level in tissues subcultured on medium containing both auxin and cytokinin. The results show that auxin and cytokinin block beta1,3-glucanase production at the level of the mRNA.
19 references, click to expand
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