Brassinosteroids are master regulators of gibberellin biosynthesis in arabidopsis

As a result of the problems with isolating florigen, and of the inconsistent results acquired, it has been suggested that florigen does not exist as an individual substance; rather, florigen's effect could be the result of a particular ratio of other hormones. [13] [14] However, more recent findings indicate that florigen does exist and is produced, or at least activated, in the leaves of the plant and that this signal is then transported via the phloem to the growing tip at the shoot apical meristem where the signal acts by inducing flowering. In Arabidopsis thaliana , some researchers have identified this signal as mRNA coded by the FLOWERING LOCUS T ( FT ) gene, others as the resulting FT protein. [15] First report of FT mRNA being the signal transducer that moves from leaf to shoot apex came from the publication in Science Magazine. However, in 2007 other group of scientists made a breakthrough saying that it is not the mRNA, but the FT Protein that is transmitted from leaves to shoot possibly acting as "Florigen". [16] The initial article [17] that described FT mRNA as flowering stimuli was retracted by the authors themselves.

Methyl jasmonate (abbreviated MeJA ) is a volatile organic compound used in plant defense and many diverse developmental pathways such as seed germination, root growth, flowering, fruit ripening, and senescence . [1] Methyl jasmonate is derived from jasmonic acid and the reaction is catalyzed by S-adenosyl-L-methionine:jasmonic acid carboxyl methyltransferase. [2] Plants produce jasmonic acid and methyl jasmonate in response to many biotic and abiotic stresses (in particular, herbivory and wounding), which build up in the damaged parts of the plant. The methyl jasmonate can be used to signal the original plant’s defense systems or it can be spread by physical contact or through the air to produce a defensive reaction in unharmed plants. The unharmed plants absorb the airborne MeJA through either the stomata or diffusion through the leaf cell cytoplasm. An herbivorous attack on a plant causes it to produce MeJA both for internal defense and for a signaling compound to other plants. [3]

All-female cucumber varieties were a sensation when they appeared in the late 1960s, according to the Foods and Food Production Encyclopedia . Many big growers have found them profitable for commercial operations, and amateur gardeners, now able to buy all-female cucumber seeds, find them easy to grow in the home garden. But until now, no one had discovered the gene responsible for them, and all-female cukes were created either by extreme inbreeding or by dosing with brassinosteroids , a naturally produced but artificially applied type of plant hormone. Finding the specific gene responsible for deciding the sex of flowers may open up new ways of creating higher yielding all-female cucumbers.

Brassinosteroids are master regulators of gibberellin biosynthesis in arabidopsis

brassinosteroids are master regulators of gibberellin biosynthesis in arabidopsis

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