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

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)....

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Bibliographic Details
Published in:Journal of plant biology = Singmul Hakhoe chi 2005-06, Vol.48 (2), p.170-177
Main Authors: Oh, Min-Hyuk, Kim, Jin-Hong, Zulfugarov, Ismayil S., Moon, Yong-Hwan, Rhew, Tae-Hyong, Lee, Choon-Hwan
Format: Article
Language:English
Subjects:
Abscisic acid
Benzyladenine
Chlorophyll
Degradation
Dismantling
Genotypes
Mutants
Photochemicals
Photosynthetic apparatus
Photosystem II
Senescence
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Summary: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.
ISSN:1226-9239
1867-0725
DOI:10.1007/BF03030405