第1126回生物科学セミナー
Global adjustment of gene expression in Arabidopsis leaves during long-term acclimation to photo-oxidative stress
Dr. Matsubara Shizue（Institute of Geo- and Biosciences 2 (IBG-2):Plant Sciences, Forschungszentrum Jülich）
2016年12月22日(木) 16:50-18:35 理学部2号館 講堂
Optimizing photosynthetic resource use efficiency is a major goal of the endeavor to enhance photosynthesis for improved and sustainable crop production. Such optimization, however, should not interfere with the efficiency of apparently inefficient (wasteful) processes which confer flexibility, protection, resilience, and thus fitness to plants in changing and adverse environments. When exposed to highly fluctuating light conditions for days, the model plant Arabidopsis primarily or initially shows upregulation of photoprotection at the expense of carbon gain and growth. Towards understanding the mechanisms of long-term adjustment of photoprotection, we have analyzed leaf transcriptome in Arabidopsis wildtype plants during acclimation to photo-oxidative stress induced by fluctuating light, focusing on long-lasting (non-transient) changes and downstream genes that may give rise to the observed phenotypic alterations. The results highlight context-dependent (non-constitutive) adjustment of gene expression during acclimation, differing markedly between young and mature leaves and also at different times of the day in the same leaves. Besides these global effects of leaf development and circadian clock on acclimation, specific changes in gene expression related to photosynthesis and photoprotection will be presented.
参考文献:
Matsubara S, Schneider T and Maurino V (2016) Dissecting long-term adjustments of photoprotective and photo-oxidative stress acclimation occurring in dynamic light environments. Frontiers in Plant Science 7: 1690.
