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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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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.

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Abbreviations

ABA:

abscisic acid

BA:

benzyladenine

Chl:

chlorophyll

DIS:

dark-induced senescence

LHCII:

light-harvesting complex II

WT:

wild-type

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Authors and Affiliations

  1. Department of Molecular Biology, Pusan National University, 609-735, Busan, Korea

    Min-Hyuk Oh, Jin-Hong Kim, Ismayil S. Zulfugarov, Yong-Hwan Moon & Choon-Hwan Lee

  2. Department of Biology, Pusan National University, 609-735, Busan, Korea

    Tae-Hyong Rhew

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  1. Min-Hyuk Oh
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  2. Jin-Hong Kim
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  3. Ismayil S. Zulfugarov
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  4. Yong-Hwan Moon
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  6. Choon-Hwan Lee
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Correspondence to Choon-Hwan Lee.

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Oh, MH., Kim, JH., Zulfugarov, I.S. et al. Effects of benzyladenine and abscisic acid on the disassembly process of photosystems in anArabidopsis delayed-senescence mutant,ore9 . J. Plant Biol. 48, 170–177 (2005). https://doi.org/10.1007/BF03030405

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  • DOI: https://doi.org/10.1007/BF03030405

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