Irradiance stress responses of gas exchange and antioxidant enzyme contents in pariparoba [Pothomorphe umbellata (L.) Miq.] plants

Title:

Irradiance stress responses of gas exchange and antioxidant enzyme contents in pariparoba [Pothomorphe umbellata (L.) Miq.] plants

Creator:

Marchese, J. A., Mattana, R. S., Ming, L. C., Broetto, F., Vendramini, P. F., and Moraes, R. M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:62fb70d4-9d0d-414c-987d-e752d07cf97f
uuid:62fb70d4-9d0d-414c-987d-e752d07cf97f
issn:0300-3604
doi:10.1007/s11099-008-0085-x

Subject:

catalase, chlorophyll, oxidative stress, photosynthesis, shade plants, stomatal conductance, superoxide dismutase, and transpiration rate

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We evaluated the growth and development of the medicinal species Pothomorphe umbellata (L.) Miq. under different shade levels (full sun and 30, 50, and 70 % shade, marked as I100, I70, I50, and I30, respectively) and their effects on gas exchange and activities of antioxidant enzymes. Photosynthetically active radiation varied from 1 254 µmol m-2 s-1 at I100 to 285 µmol m-2 s-1 at I30. Stomatal conductance, net photosynthetic rate, and relative chlorophyll (Chl) content were maximal in I70 plants. Plants grown under I100 produced leaves with lower Chl content and signs of chlorosis and necrosis. These symptoms indicated Chl degradation induced by the generation of reactive oxygen species. Stress related antioxidant enzyme activities (Mn-SOD, Fe-SOD, and Cu/Zn-SOD) were highest in I100 plants, whereas catalase activity was the lowest. Hence P. umbellata is a shade species (sciophyte), a feature that should be considered in reforestation programs or in field plantings for production of medicinal constituents. and J. A. Marchese ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

501-505

Source:

Photosynthetica | 2008 Volume:46 | Number:4

Harvested from:

CDK

Metadata only:

false