Changes in chlorophyll a and b contents and acivities of photosystems 1 and 2 in rice seedlings induced by NaCl

Title:

Changes in chlorophyll a and b contents and acivities of photosystems 1 and 2 in rice seedlings induced by NaCl

Creator:

Singh, A.K. and Dubey, R.S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:76bb4333-77ce-4857-9ee1-bca6aa1211ec
uuid:76bb4333-77ce-4857-9ee1-bca6aa1211ec
urnnbn:urn:nbn:cz:aba007-000fp1

Subject:

carotenoids, fluorescence, Hill reaction, Oryza sativa L., photosynthesis, plant age, salinity, and salt tolerance.

Type:

model:internalpart and TEXT

Format:

print

Description:

During a 5-20 d growth at moderate salinity (7 dS m‘i) in rice seedlings of salt sensitive cultivars Ratna and Jaya a larger decrease in chlorophyll (Chl) a and b contents was observed than in tolerant cvs. CSR-1 and CSR-3. At higher salinity (14 dS m'i) about 40 % declines in both whole chain electron transport and photosystem (PS) 2 activities were observed in the tolerant cvs. and about 62 to 67 % declines in the sensitive ones. No apparent change in PSI activity was observed due to salinization in the both sets of cultivars. Higher rate of Hill reaction was observed in chloroplasts ffom salt stressed seedlings of tolerant cultivars whereas inhibition in this activity was found in the sensitive ones. Chloroplasts isolated from stressed seedlings of sensitive cultivars showed about 31 % reduction in fluorescence emission at 685 nm as well as a major decrease in absorption with shifts in peaks in the visible region of spectrum. Thus salt sensitivity in rice is associated with decreased contents of Chls and carotenoids, PS2 and Hill reaction activities, and fluorescence emission.

Language:

Multiple languages

Rights:

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

Coverage:

489-499 and 11-21

Source:

Photosynthetica | 1995 Volume:31 | Number:4

Harvested from:

CDK

Metadata only:

false