11月9日Chlorophyll breakdown during leaf senescence and fruit ripening
发布时间:2011-11-07  阅读次数:483

现代植物生物学系列讲座
Chlorophyll breakdown during leaf senescence and fruit ripening

 
Prof. Dr. Stefan Hörtensteiner
Institute of Plant Biology,
University of Zurich,
CH-8008 Zurich, Switzerland
phone: + 41 44 634 82 82
fax: + 41 44 634 82 04
e-mail: shorten@botinst.uzh.ch
 
 


Research area: Molecular elucidation of chlorophyll breakdown during senescence
 
Contributions: Chlorophyll breakdown is embedded in the final developmental stage of leaf development, called senescence, which aims at remobilization of leaf nutrients, such as nitrogen. Due to its light-absorbing properties, free chlorophyll would have cell toxic effects and, therefore, plants require a mechanism to convert chlorophyll to non-colored, i.e. non excitable, breakdown products termed NCCs. Thus chlorophyll breakdown can be considered as a detoxification process, and its pathway consists of several common and species-specific reactions. A key step is the loss of green color catalyzed by the joint action of two enzymes, pheophorbide a oxygenase (PAO) and red chlorophyll catabolite reductase (RCCR). Genes of PAO and RCCR have been identified and their functions analyzed intensively in our lab. Recently a new protein termed pheophytinase (PPH) was also identified, which is responsible for the phytol hydrolyzing activity on Mg-free chlorophyll. As a result, the order of early chlorophyll breakdown events is modified. The above and other related work have been published in The Plant Cell, PNAS, Trends Plant Sci, Plant J, Plant Physiol, New Phytol, FEBS Lett and Plant Mol Biol.
 
时 间:2011年11月9日(星期二)下午2:00
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