By Eva Zažímalová, Jan Petrášek, Eva Benková

ISBN-10: 3709115256

ISBN-13: 9783709115251

ISBN-10: 3709115264

ISBN-13: 9783709115268

Auxin is a crucial signaling compound in vegetation and very important for plant improvement and development. the current e-book, Auxin and its position in Plant improvement, presents the reader with specified and finished perception into the functioning of the molecule most of the time 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 explicit position of auxin in plant improvement and the 3rd half describes the interplay and functioning of the signaling compound upon stimuli of our surroundings. every one bankruptcy is written through overseas specialists within the respective box and designed for scientists and researchers in plant biology, plant improvement and mobile biology to summarize the new development in realizing the position of auxin and recommend destiny views for auxin research.

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4 Deactivation of IAA The active form of IAA is believed to be free IAA. The carboxyl group in IAA is essential for its auxin activities. IAA is inactivated by complete oxidation, a process that is still not well understood. IAA can also be taken out of action by forming various conjugates with alcohols, sugars, and amino acids (Woodward and Bartel 2005). 1 Synthesis of IAA Conjugates Great progresses have been made in recent years towards understanding the enzymes responsible for synthesizing IAA esters and amide conjugates.

Overexpression of any of the YUC family members leads to auxin overproduction phenotypes in Arabidopsis, suggesting that all of the YUC genes participate in auxin biosynthesis (Cheng et al. 2006, 2007). The YUC genes have overlapping functions and inactivation of a single YUC gene does not cause any obvious developmental defects (Cheng et al. 2006, 2007). The observed genetic redundancy among YUC genes may provide an explanation for why YUC genes had not been discovered previously by forward loss-of-function genetic screens.

IAA can also be taken out of action by forming various conjugates with alcohols, sugars, and amino acids (Woodward and Bartel 2005). 1 Synthesis of IAA Conjugates Great progresses have been made in recent years towards understanding the enzymes responsible for synthesizing IAA esters and amide conjugates. In maize, synthesis of IAA-ester with sugar starts with the formation of IAA-glucose that is preceded by activation of glucose by the formation of glucose-UDP that is then joined with IAA. IAA-glucose is further converted to other IAA-sugar ester conjugates that are mostly believed to be a storage form of IAA (Michalczuk and Bandurski 1982; Leznicki and Bandurski 1988a, b).

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


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