The effect of irradiance and water restriction on photosynthesis in young jatobá-do-cerrado (Hymenaea stigonocarpa) plants

Title:

The effect of irradiance and water restriction on photosynthesis in young jatobá-do-cerrado (Hymenaea stigonocarpa) plants

Creator:

Costa, A. C., Rezende-Silva, S. L., Megguer, C. A., Moura, L. M. F., Rosa, M., and Silva, A. A.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:c6a70fa5-9401-438a-b803-c05862ce09d5
uuid:c6a70fa5-9401-438a-b803-c05862ce09d5
issn:0300-3604
doi:10.1007/s11099-015-0085-6

Subject:

fotosyntéza, photosynthesis, Brazílie, Brasil, Brazil savanna, luminosity, photoinhibition, water potential, jatobá-do-cerrado, Hymenaea stigonocarpa, Cerrado, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

High irradiance promotes decreases in the quantum yield in plants, which reduce the photosynthetic rate. The excess of light in combination with water deficit can intensify the response of plants to stress, especially in species susceptible to those factors. The aim of the present study was to characterize the photosynthetic activity of young jatobá-do-cerrado (Hymenaea stigonocarpa Mart. ex Hayne) trees under different irradiance conditions, both alone and/or in combination with water deficit. Four irradiances [45, 230, 510, and 1,700 μmol(photon) m-2 s-1] and two levels of water in soil (90% and 50% of field capacity) were used. Gas exchange, water potential, and chlorophyll a fluorescence were measured. The highest rates of photosynthesis were observed under irradiances of 230 and 510 μmol(photon) m-2 s-1. Irradiance of 1,700 μmol(photon) m-2 s-1 led to the photoinhibition of photosynthesis, as indicated by a reduced maximum quantum yield of PSII, effective quantum yield ratio, and electron transport rate, as well as higher nonphotochemical quenching. The most stressful to young H. stigonocarpa plants was high irradiance, while water deficit did not intensify the response to light stress., A. C. Costa, S. L. Rezende-Silva, C. A. Megguer, L. M. F. Moura, M. Rosa, A. A. Silva., and Obsahuje bibliografii

Language:

Multiple languages

Rights:

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

Coverage:

118-127

Source:

Photosynthetica | 2015 Volume:53 | Number:1

Harvested from:

CDK

Metadata only:

false