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Effect of inorganic phosphate, 3‐phosphoglycerate and glucose‐6‐phosphate on net starch synthesis by isolated chloroplasts of Codium fragile (Suringar) Hariot
Author(s) -
WILLIAMS MICHAEL L.,
COBB A. H.
Publication year - 1988
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1988.tb04165.x
Subject(s) - starch , chloroplast , phosphate , photosynthesis , biochemistry , chemistry , biology , botany , gene
SUMMARY Net starch synthesis isolated chloroplasts of Codium fragile appears to be regulated in a similar manner to that of vascular plants. Exogenous 10 mol m −3 PGA stimulated net starch synthesis at 200 μmol m −2 s −1 (PPFD) by approx. 69%, whilst 10 mol m −3 P 1 not only inhibited synthesis but also promoted net starch degradation. However, unlike vascular plant chloroplasts, 10 mol m −3 G6P was found to stimulate net starch synthesis by approx. 52% under the same conditions. This apparent difference in response to exogenous G6P is discussed in relation to the operation of the P 1 ‐G6P translocator in chloroplasts of this species