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Effects of benzyladenine and abscisic acid on the disassembly process of photosystems in anArabidopsis delayed-senescence mutant,ore9

한국식물학회지 2005년 48권 2호 p.170 ~ 177
Oh Min-Hyuk, 김진홍, Zulfugarov Ismayil S., 문용환, Rhew Tae-Hyong, 이춘환,
소속 상세정보
 ( Oh Min-Hyuk ) - Pusan National University Department of Molecular Biology
김진홍 ( Kim Jin-Hong ) - Pusan National University Department of Molecular Biology
 ( Zulfugarov Ismayil S. ) - Pusan National University Department of Molecular Biology
문용환 ( Moon Yong-Hwan ) - Pusan National University Department of Molecular Biology
 ( Rhew Tae-Hyong ) - Pusan National University Department of Biology
이춘환 ( Lee Choon-Hwan ) - Pusan National University Department of Molecular Biology

Abstract


Using wild-type (WT) leaves and those from anore9 delayed-senescenceArabidopsis mutant, we investigated the delaying and accelerating effects of benzyladenine (BA) and abscisic acid (ABA), respectively, on the degradation process of the photosynthetic apparatus during dark-induced senescence (DIS). In the mutant, delays were seen for both the breakdown of chlorophyll (Chl) and the decrease in photochemical efficiency of photosystem II (Fv/Fm). Moreover, each step was prolonged in the disassembly process of the Chl-protein complexes. In the presence of BA, Chl degradation was retarded to a similar extent for both the mutant and the WT, but the decrease in Fv/Fm was not. However, in the presence of ABA, the two processes were accelerated in both genotypes. Therefore, although theore9 mutation causes this functional delayed-senescence, it may not be related to the non-functional delay that happens afterwards. In contrast, BA seems to affect both processes.

키워드

abscisic acid; Arabidopsis; benzyladenine; dark-induced senescence; photosynthesis; stay-green mutant

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