Temperature and light dependence of photosynthetic activities in wheat seedlings grown in the presence of DCMU [3-(3,4-dichlorophenyl)-1,1-dimethylurea]

Title:

Temperature and light dependence of photosynthetic activities in wheat seedlings grown in the presence of DCMU [3-(3,4-dichlorophenyl)-1,1-dimethylurea]

Creator:

Muthuchelian, K., Bertamini, M., and Nedunchezhian, N.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:85ea3bdc-1738-4fb9-af84-c3b61179c67d
uuid:85ea3bdc-1738-4fb9-af84-c3b61179c67d
issn:0300-3604
doi:10.1023/A:1015138628501

Subject:

chlorophyll fluorescence, donor side, electron transport, photosystem, thylakoid membrane proteins, and Triticum

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Photosynthetic electron transfer was studied in thylakoids isolated from control and DCMU-grown wheat (Triticum aestivum L.) seedlings. When exposed to high temperature (HT) and high iradiance (HI), thylakoids showed large variations in the photosynthetic electron transport activities and thylakoid membrane proteins. A drastic reduction in the rate of whole electron transport chain (H2O → MV) was envisaged in control thylakoids when exposed to HT and HI. Such reduction was mainly due to the loss of photosystem 2, PS2 (H2O → DCBQ) activity. The thylakoids isolated from seedlings grown in the presence of DCMU showed greater resistance to HT and HI treatment. The artificial exogenous electron donors MnCl2, DPC, and NH2OH failed to restore the HI induced loss of PS2 activity in both control and DCMU thylakoids. In contrast, addition of DPC and NH2OH significantly restored the HT induced loss of PS2 activity in control thylakoids and partially in DCMU thylakoids. Similar results were obtained when Fv/Fm was evaluated by chlorophyll fluorescence measurements. The marked loss of PS2 activity in control thylakoids was evidently due to the loss of 33, 23, and 17 kDa extrinsic polypeptides and 28-25 kDa LHCP polypeptides. and K. Muthuchelian, M. Bertamini, N. Nedunchezhian.

Language:

Multiple languages

Rights:

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

Coverage:

411-418

Source:

Photosynthetica | 2001 Volume:39 | Number:3

Harvested from:

CDK

Metadata only:

false