Low night temperature-induced changes in photosynthesis and rubber accumulation in guayule (Parthenium argentatum Gray)

Title:

Low night temperature-induced changes in photosynthesis and rubber accumulation in guayule (Parthenium argentatum Gray)

Creator:

Sundar, D. and Ramachandra Reddy, A.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:46bab19a-33bc-44fb-85c0-45bd2e5d606e
uuid:46bab19a-33bc-44fb-85c0-45bd2e5d606e
issn:0300-3604
doi:10.1023/A:1010990024506

Subject:

chlorophyll, fructose-6-phosphate, net photosynthetic rate, photosystems 1 and 2, proteins, rubber transferase, starch, saccharose, sucrose phosphate synthase, and superoxide dismutase

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Three-year-old plants of Parthenium argentatum Gray cv. 11591 grown under natural photoperiod were exposed for 60 d to low night temperature (LNT) of 15 °C (daily from 18:00 to 06:00). Effects of the treatment on net photosynthetic rates (PN), rubber accumulation, and associated biochemical traits were examined. LNT initially reduced PN with a parallel decline in the activities of ribulose-1,5-bisphosphate carboxylase, fructose bisphosphatase, and sucrose phosphate synthase for 20-30 d. Later, LNT enhanced PN and the activities of photosynthetic enzymes. Associated with high PN in LNT-treated guayule plants was a two-fold increase in rubber content and rubber transferase activity per unit of protein. The initial decrease in PN in LNT-treated guayule was associated with low content of chlorophyll (a+b), large starch accumulation, and higher ratio of glucose-6-phosphate/fructose-6-phosphate. Photosystem 2 activity in isolated chloroplasts was initially decreased, but increased after 30 d. There was a significant increase in the leaf soluble protein content in LNT-treated plants. Hence the photosynthetic performance of plants grown at 15 °C night temperature for 50 d was superior to those grown under natural photoperiod in all parameters studied. The high photosynthetic capacity may contribute to superior rubber yields under LNT. and D. Sundar, A. Ramachandra Reddy.

Language:

Multiple languages

Rights:

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

Coverage:

421-427

Source:

Photosynthetica | 2000 Volume:38 | Number:3

Harvested from:

CDK

Metadata only:

false