Regulatory role of phytochrome on ultravioIet-B (280-315 nm) induced changes in growth and photosynthetic activities of Vigna siuemis L.

Title:

Regulatory role of phytochrome on ultravioIet-B (280-315 nm) induced changes in growth and photosynthetic activities of Vigna siuemis L.

Creator:

Lingakumar, K. and Kulandanvelu, G.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:114ffb6d-f95c-4cf9-85e5-33847aff166d
uuid:114ffb6d-f95c-4cf9-85e5-33847aff166d
urnnbn:urn:nbn:cz:aba007-000fhk

Type:

model:internalpart and TEXT

Format:

print

Description:

Four-d-old seedlings were exposed to ultraviolet-B, UV-B (20 pinol ht^), and UV-B supplemented with red, R {X 612 nin, 5 pmol nr^) or far-red, FR (X 712 nin, 4.5 pmol nr^) radiation for 30 min during the middle of tlie light phase. Three d of UV-B treatment caused reduction in shoot elongation and expansion of cotyledonaiy leaves. The reduction was largely reversed by supplementary R and FR radiations. Supplementation of FR accelerated senescence process. Similar changes were also noted in the contents of photosynthetic piginents, while the level of anthocyanin was enhanced by all treatments. Flavonoid accumulation was enhanced by UV-B, whereas R and FR radiations suppressed its synthesis to various degrees. The chlorophyll (Chl) fluorescence ratio Fy/F,„ and half-rise time of maximum fluorescence were greatly reduced by UV-B and with FR supplementation. R reversed this UV-B inhibition to a great extent. Likewise, tlie P-S dechne was higher under control and +UV-B+R than under +UV-B and +UV-B+FR treatments, At the protein level both the subunits of ribulose 1,5-bisphosphate carboxylase alone were regulated by phytochrome. All these experiments indicated a possible role of phytochrome in regulating the UV-B induced changes in plant morphology and chloroplast proteins.

Language:

Multiple languages

Rights:

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

Coverage:

341-351 and 23-33

Source:

Photosynthetica | 1993 Volume:29 | Number:3

Harvested from:

CDK

Metadata only:

false