alexa The Effect of Abscisic Acid and Other Inhibitors on Photosynthetic Capacity and the Biochemistry of CO(2) Assimilation.
Geology & Earth Science

Geology & Earth Science

Journal of Oceanography and Marine Research

Author(s): Seemann JR, Sharkey TD

Abstract Share this page

Abstract Abscisic acid (ABA) was shown to reduce the photosynthetic capacity of a leaf through an apparent inhibition of ribulose 1,5-bisphosphate (RuBP) carboxylase (RuBPCase) activity, in addition to promoting stomatal closure. By comparison with the effects of other inhibitors of photosynthesis (cyanazine, methyl viologen, sodium azide, nigericin, sodium cyanide) on whole leaf photosynthesis, RuBPCase activity and metabolite pool sizes, it was demonstrated that the biochemical basis for the apparent effect of ABA on RuBPCase activity was not the result of reduced substrate availability, decarbamylation of the enzyme, or synthesis of carboxyarabinitol 1-phosphate, the naturally occurring tight-binding inhibitor of the enzyme. An inhibition of photosynthetic capacity showing the same biochemical characteristics as ABA-fed leaves was observed in plants grown under saline conditions. We suggest that the common link between environmental stress and reductions in photosynthetic capacity may be ABA. We hypothesize that ABA may affect plasma membrane function and thus indirectly RuBPCase activity through altered ion fluxes. The results of feeding cyanazine, methyl viologen, and nigericin provide additional evidence that regulation of RuBPCase activity by carbamylation/decarbamylation is related to the extent to which the capacity for ATP formation limits photosynthesis.
This article was published in Plant Physiol and referenced in Journal of Oceanography and Marine Research

Relevant Expert PPTs

Relevant Speaker PPTs

Relevant Topics

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version