Differential inhibition of photosynthesis under drought stress in Flaveria species with different degrees of development of the C4 syndrome

Title:

Differential inhibition of photosynthesis under drought stress in Flaveria species with different degrees of development of the C4 syndrome

Creator:

Dias, M. C. and Brüggemann, W.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:bd81681f-1f52-48db-aac9-91265ded4352
uuid:bd81681f-1f52-48db-aac9-91265ded4352
issn:0300-3604
doi:10.1007/s11099-007-0012-6

Subject:

bundle sheath cells, C3, C4 metabolism, CO2 compensation concentration, malic enzyme, NADP-malate dehydrogenase, phosphoenolpyruvate carboxylase, pyruvate-orthophosphate dikinase, RuBP, RuBPCO, stromal fructose 1,6-bisphosphatase, and water potential

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The effect of drought stress (DS) on photosynthesis and photosynthesis-related enzyme activities was investigated in F. pringlei (C3), F. floridana (C3-C4), F. brownii (C4-like), and F. trinervia (C4) species. Stomatal closure was observed in all species, probably being the main cause for the decline in photosynthesis in the C3 species under ambient conditions. In vitro ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) and stromal fructose 1,6-bisphosphatase (sFBP) activities were sufficient to interpret the net photosynthetic rates (PN), but, from the decreases in PN values under high CO2 (C a = 700 µmol mol- 1) it is concluded that a decrease in the in vivo rate of the RuBPCO reaction may be an additional limiting factor under DS in the C3 species. The observed decline in the photosynthesis capacity of the C3-C4 species is suggested to be associated both to in vivo decreases of RuBPCO activity and of the RuBP regeneration rate. The decline of the maximum PN observed in the C4-like species under DS was probably attributed to a decrease in maximum RuBPCO activity and/or to decrease of enzyme substrate (RuBP or PEP) regeneration rates. In the C4 species, the decline of both in vivo photosynthesis and photosynthetic capacity could be due to in vivo inhibition of the phosphoenolpyruvate carboxylase (PEPC) by a twofold increase of the malate concentration observed in mesophyll cell extracts from DS plants. and M. C. Dias, W. Brüggemann.

Language:

Multiple languages

Rights:

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

Coverage:

75-84

Source:

Photosynthetica | 2007 Volume:45 | Number:1

Harvested from:

CDK

Metadata only:

false