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Evidence of plastid control of abscisic acid accumulation in barley hordeum vulgare

, : Evidence of plastid control of abscisic acid accumulation in barley hordeum vulgare. Zeitschrift fuer Pflanzenphysiologie 114(4): 295-308

Two treatments affecting the functioning of barley (H. vulgare L.) plastids were used to study the localization and control of ABA [abscisic acid] accumulation in response to partial dehydration. The X-ray induced barley mutant albostrians was used to compare ABA accumulation in green, white and striped mutant leaves, and in green leaves of albostrians which were treated with the herbicide norflurazon [NF]. NF inhibits carotenoid synthesis and in high light results in photo-bleaching of chlorophyll. ABA accumulation was severely inhibited in completely white mutant leaves, in white portions of striped leaves, and in NF-treated leaves which had been photo-bleached. These leaves also had much lower stomatal conductances than those of green leaves, and plastid ribosomes were completely absent. NF had no effect on ABA accumulation in leaves grown in the dark, in low light (where NF reduced carotenoid but not chlorophyll levels) and in high light prior to the onset of photo-bleaching. In all these treatments plastid ribosomes were still present. Although hardly any ABA accumulation took place in white leaves, the presence of low levels of ABA in these leaves was indicated by UV isomerization of assay samples. Protein synthesis on plastid ribosomes was necessary at some stage for drought stress to elicit a rise in ABA synthesis. Enzymes for every step in the synthesis of ABA are encoded on nuclear DNA.

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