Auxin and Its Role in Plant Development by Eva Zažímalová, Jan Petrášek, Eva Benková

By Eva Zažímalová, Jan Petrášek, Eva Benková

Auxin is a vital signaling compound in vegetation and very important for plant improvement and progress. the current publication, Auxin and its function in Plant improvement, presents the reader with particular and complete perception into the functioning of the molecule most likely and in particular in plant improvement. within the first half, the functioning, metabolism and signaling pathways of auxin in vegetation are defined, the second one half depicts the categorical function of auxin in plant improvement and the 3rd half describes the interplay and functioning of the signaling compound upon stimuli of our surroundings. each one bankruptcy is written through foreign specialists within the respective box and designed for scientists and researchers in plant biology, plant improvement and phone biology to summarize the new development in figuring out the position of auxin and recommend destiny views for auxin research.

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Extra info for Auxin and Its Role in Plant Development

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The conversion of IAN to IAA is catalyzed by nitrilases. Inactivation of nitrilase genes leads to resistance to exogenous IAN, but the nitrilase mutants do not display obvious developmental defects observed in known auxin signaling and transport mutants (Bartel and Fink 1994; Normanly et al. 1997). Arabidopsis genome contains four copies of the nitrilase gene. The developmental consequences of disrupting all four nitrilase genes have not been investigated, partially due to the fact that two of the copies are immediately adjacent to each other on the same chromosome.

2001; Stepanova et al. 2008; Tao et al. 2008). But several recent genetic studies have demonstrated that YUCs and TAAs participate in the same pathway (Mashiguchi et al. 2011; Stepanova et al. 2011; Won et al. 2011). The yuc mutants and taa mutants share many similarities. For example, yuc1 yuc2 yuc4 yuc6 quadruple mutants have dramatic vascular and floral defects, which are also observed in taa1 tar2 double mutants (Cheng et al. 2006; Stepanova et al. 2008). In fact, all of the characteristics of taa mutants can be phenocopied by inactivating certain combinations of YUC genes (Won et al.

The genetic data suggest that the observed auxin activities of IBA depend on the conversion of IBA to IAA (Zolman et al. 2000; Strader et al. 2010). However, it has not been completely ruled out that IBA itself has some biological activities (Simon et al. 2013). The physiological roles of IBA-derived IAA are difficult to determine because the enzymes responsible for IBA to IAA conversion may also participate in other pathways such as fatty acid metabolism. Recent characterization of mutations resistant to IBA leads to the discovery that disruption of ENOYL-COA HYDRATASE2 (ECH2) gene causes defects in IBA responsiveness, but appears not to affect sugar and fatty acid metabolism.

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