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KMID : 0368420050480020170
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Journal of Plant Biology
2005 Volume.48 No. 2 p.170 ~ p.177
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Effects of benzyladenine and abscisic acid on the disassembly process of photosystems in anArabidopsis delayed-senescence mutant,ore9
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Oh Min-Hyuk
Kim Jin-Hong
Zulfugarov Ismayil S.
Moon Yong-Hwan
Rhew Tae-Hyong
Lee Choon-Hwan
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Abstract
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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.
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KEYWORD
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abscisic acid, Arabidopsis, benzyladenine, dark-induced senescence, photosynthesis, stay-green mutant
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