Photosynthetic responses of Populus przewalski subjected to drought stress

Title:

Photosynthetic responses of Populus przewalski subjected to drought stress

Creator:

Yin, C. Y., Berninger, F., and Li, C. Y.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:3155304c-f7f3-4aa2-af65-c6d356277bb4
uuid:3155304c-f7f3-4aa2-af65-c6d356277bb4
issn:0300-3604
doi:10.1007/s11099-005-0159-y

Subject:

chlorophyll fluorescence, dark respiration rate, diurnal changes, gas exchange, intercellular CO2 concentration, stomatal conductance, and water use efficiency

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Cuttings of P. przewalski were exposed to two different watering regimes which were watered to 100 and 25 % of field capacity (WW and WS, respectively). Drought stress not only significantly decreased net photosynthetic rate (PN), transpiration rate (E), stomatal conductance (gs), efficiency of photosystem 2 (PS2) (Fv/Fm and yield), and increased intrinsic water use efficiency (WUEi) under controlled optimal conditions, but also altered the diurnal changes of gas exchange, chlorophyll fluorescence, and WUEi. On the other hand, WS also affected the PN-photosynthetically active radiation (PAR) response curve. Under drought stress, PN peak appeared earlier (at about 10:30 of local time) than under WW condition (at about 12:30). At midday, there was a depression in PN for WS plants, but not for WW plants, and it could be caused by the whole microclimate, especially high temperature, low relative humidity, and high PAR. There were stomatal and non-stomatal limitations to photosynthesis. Stomatal limitation dominated in the morning, and low PN at midday was caused by both stomatal and non-stomatal limitations, whereas non-stomatal limitation dominated in the afternoon. In addition, drought stress also increased compensation irradiance and dark respiration rate, and decreased saturation irradiance and maximum net photosynthetic rate. Thus drought stress decreased plant assimilation and increased dissimilation through affected gas exchange, the diurnal pattern of gas exchange, and photosynthesis-PAR response curve, thereby reducing plant growth and productivity. and C. Y. Yin, F. Berninger, C. Y. Li.

Language:

Multiple languages

Rights:

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

Coverage:

62-68

Source:

Photosynthetica | 2006 Volume:44 | Number:1

Harvested from:

CDK

Metadata only:

false