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• W2129304587 abstract "The formation of 5-aminolevulinate is a key regulatory step in tetrapyrrole biosynthesis. In higher plants, glutamate 1-semialdehyde aminotransferase (GSA-AT) catalyzes the last step in the sequential conversion of glutamate to 5-aminolevulinate. Antisense RNA synthesis for GSA-AT leads to reduced GSA-AT protein levels in tobacco (Nicotiana tabacum L.) plants. We have used these transgenic plants for studying the significance of chlorophyll (Chl) availability for assembly of the light-harvesting apparatus. To avoid interfering photoinhibitory stress, plants were cultivated under a low photon flux density of 70 [mu]mol photons m-2 s-1. Decreased GSA-AT expression does not seem to suppress other enzymic steps in the Chl pathway, indicating that reduced Chl content in transgenic plants (down to 12% of the wild-type level) is a consequence of reduced GSA-AT activity. Chl deficiency correlated with a drastic reduction in the number of photosystem I and photosystem II reaction centers and their surrounding antenna on a leaf area basis. Different lines of evidence from the transgenic plants indicate that complete assembly of light-harvesting pigment-protein complexes is given preference over synthesis of new reaction center/core complexes, resulting in fully assembled photosynthetic units with no reduction in antenna size. Photosynthetic oxygen evolution rates and in vivo Chl fluorescence showed that GSA-AT antisense plants are photochemically competent. Thus, we suggest that under the growth conditions chosen during this study, plants tend to maintain their light-harvesting antenna size even under limited Chl supply." @default.
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• W2129304587 date "1997-04-01" @default.
• W2129304587 modified "2023-10-16" @default.
• W2129304587 title "Restriction of Chlorophyll Synthesis Due to Expression of Glutamate 1-Semialdehyde Aminotransferase Antisense RNA Does Not Reduce the Light-Harvesting Antenna Size in Tobacco" @default.
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• W2129304587 doi "https://doi.org/10.1104/pp.113.4.1113" @default.
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