Differential sensitivity of stomatal and non-stomatal components to NaCl or Na2SO4 salinity in horsegram, Macrotyloma uniflorum (Lam.)

Title:

Differential sensitivity of stomatal and non-stomatal components to NaCl or Na2SO4 salinity in horsegram, Macrotyloma uniflorum (Lam.)

Creator:

Sreenivasulu Reddy, P., Ramanjulu, S., Sudhakar, C., and Veeranjaneyulu, K.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:4e56ca86-a6ba-47e8-81f0-81bd678e7f36
uuid:4e56ca86-a6ba-47e8-81f0-81bd678e7f36
issn:0300-3604
doi:10.1023/A:1006830100627

Subject:

CO2 fixation, NADP-glyceraldehyde-3-phosphate dehydrogenase, photosystem 2 activity, ribose-5-phosphate isomerase, ribulose-1,5-bisphosphate carboxylase, ribulose-5-phosphate kinase, salt stress, and stomatal conductance

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

14CO2 assimilation rate (P), leaf diffusive conductance (gs), photosynthetic electron flow, and activities of enzymes of Calvin cycle were studied in a horsegram [Macrotyloma uniflorum (Lam.)] in response to salinity induced by NaCl or Na2SO4. A significant reduction in P and gs by both salt treatments was registered. Na2SO4 caused a greater reduction in gs than the NaCl salinity. Studies with isolated chloroplasts confirmed a greater sensitivity to NaCl than to Na2SO4. Salinity inhibited the photosynthetic electron transport. The activity of ribulose-1,5-bisphosphate carboxylase (E.C.4.1.1.39) was under salinity inhibited more than the activities of other three enzymes of the Calvin cycle, ribulose-5-phosphate kinase (E.C.2.7.1.19), ribose-5-phosphate isomerase (E.C.5.3.16), and NADP-glyceraldehyde-3-phosphate dehydrogenase (E.C.1.2.13). These inhibitions lead to a reduced capacity for ribulose-1,5-bisphosphate regeneration. Isolated chloroplasts extracted from salt stressed plants and supplemented with the substrates of Calvin cycle could elevate P, but the P was always lower than in the controls. Decreased P in horsegram exposed to high salinity can be attributed to both stomatal and non-stomatal components, however, the sensitivity to the salt source, NaCl or Na2SO4, was different. and P. Sreenivasulu Reddy ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

99-105

Source:

Photosynthetica | 1998 Volume:35 | Number:1

Harvested from:

CDK

Metadata only:

false