Abscissic acid

Phytoferritin transcription is induced by iron excess and repressed by iron deficiency in leaves as well as in roots in several plant species in the case of maize, there are two ferritin genes which are differentially regulated by two independent-signalling pathways, one involving an oxidative step and one dependent on the plant growth hormone, abscissic acid. 

Kao C, Cocciolone SM, Vasil IK, McCarty DR. 1996. Localization and interaction of the cis-acting elements for abscissic acid, WIPAROUS1 and light activation of the Cl gene of maize. Plant Cell 8 1171-1179. 

Mori, K., Saito, H., Goto-Yamamoto, N., Kitayama, M., Kobayashi, S., Sugaya, S., Gemma, H. and Hashizume, K. (2005a) Effect of abscissic acid treatment and night temperature on anthocyanin composition in Pinot noir grapes, Vitis, 44(4), 161-165. 

Kojic acid (294), a y-pyrone, isolated from T. mairei is a typical microbial metabolite and fungal contamination of the plant extract might be a reason of its formation (227). The diterpenes taxamairins A (297) and B (298) possessing tropone skeleton displayed inhibitory activity [ICj 30.21 g/ml for taxamairin A and 26.78 g/ml for taxamairin B] against hepatoma cells in vitro (228). (+)-Abscissic acid (317) was extracted from the seeds of T. baccata (229-231). The needles of T. baccata contained 26 carboxylic acids, 80% of which were shikimic (335) and quinic acids (336) (232). Rhodoxanthin (300) has been found to be present in all the species of Taxaceae (87,233). Escholtzxanthone (301) was isolated from T. baccata leaves (234). Various compounds isolated from genus Taxus which are not otherwise classified in the text are listed in Table 10. 

It is well documented that water stress may increase the level of abscissic acid (ABA) in cells (Itai and Benzioni, 1976), and there are reports that application of this hormone to leaves enhances the activity of PEP carboxylase (Huber and... 

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