Leaf phosphate status and photosynthesis in vivo: changes in sugar phosphates, adenylates and nicotinamide nucleotides during photosynthetic induction in sugar beet

Title:

Leaf phosphate status and photosynthesis in vivo: changes in sugar phosphates, adenylates and nicotinamide nucleotides during photosynthetic induction in sugar beet

Creator:

Madhusudana Rao, I. and Terry, N.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:50ca12c5-b5ee-4249-aa40-11c92368b858
uuid:50ca12c5-b5ee-4249-aa40-11c92368b858
urnnbn:urn:nbn:cz:aba007-000fkh

Type:

model:internalpart and TEXT

Format:

print

Description:

Sugar beets (Beta vulgaris L. cv. F58-554H1) were cultured hydroponically in growth chambers. Leaf orthophosphate levels were varied nutritionally. The effect of decreased leaf phosphate (low-P) status was determined on the rate of photosynthesis (PN) and on pool sizes of leaf ribulose-l,5-bisphosphate (RuBP), 3-phosphoglycerate (PGA), triose phosphate (triose-P), fructose-1,6-bisphosphate (FBP), fructose-6-phosphate (F6P), glucose-6-phosphate (G6P), adenylates and nicotinamide nucleotides during photosynthetic induction (measured at 0, 1.5, 5 and 30 min from irradiation). p N reached 50 % of its final value in 4 min in control leaves and 10 min in low-P leaves. Hence the increase in the length of induction period in low-P leaves was most likely due to a slow build-up in RuBP: ATP, NADPH, PGA, and FBP all reached high levels in 5 min at which time RuBP was half and PN 16 % of their eventual values at 30 min. The slow-build-up of RuBP did not appear to be due to insufficient ATP and NADPH for the conversion of PGA to triose-P; rather, low-P seemed to limit photosynthetic induction somewhere in the sequence of reactions between triose-P and RuBP formation.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

243-254 and 85-96

Source:

Photosynthetica | 1994 Volume:30 | Number:2

Harvested from:

CDK

Metadata only:

false