Photosynthesis and chlorophyll fluorescence in two hybrids of sorghum under different nitrogen and water regimes

Title:

Photosynthesis and chlorophyll fluorescence in two hybrids of sorghum under different nitrogen and water regimes

Creator:

Cechin, I.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:01a2550e-52bb-4114-8507-ed54ced129d8
uuid:01a2550e-52bb-4114-8507-ed54ced129d8
issn:0300-3604
doi:10.1023/A:1006910823378

Subject:

drought, intercellular CO2 concentration, leaf water potential, photosystem 2, Sorghum bicolor, stomatal conductance, transpiration rate, and water use efficiency

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

In two hybrids of sorghum (Sorghum bicolor Moench.), C51 and C42, high nitrogen concentration (HN) increased net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E) of well watered (HW) plants. Water stressing (LW plants) resulted in low PN, gs, and E in both hybrids, but the values were still higher in HN plants as compared to low nitrogen-grown (LN) plants. Intercellular CO2 concentration (Ci) increased in droughted plants. This increase was much higher in LN plants as compared to HN plants. Instantaneous water use efficiency was lower in LN plants as a consequence of a greater effect of water stress on photosynthesis. Leaf water potential was reduced by water stress in all treatments. Analysis of chlorophyll a fluorescence at room temperature showed that photosystem 2 (PS2) was rather tolerant to the water stress imposed. Water stress caused a slight decrease in the efficiency of excitation capture by open PS2 reaction centres (Fv/Fm). The in vivo quantum yield of PS2 photochemistry (ΦPS2) and the photochemical quenching coefficient (qP) were slightly reduced, while the nonphotochemical quenching coefficient (qN) was increased under the water stress. However, in hybrid C42 these characters were little or not affected by the water stress.

Language:

Multiple languages

Rights:

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

Coverage:

233-240

Source:

Photosynthetica | 1998 Volume:35 | Number:2

Harvested from:

CDK

Metadata only:

false