Interactive effects of salinity and ozone pollution on photosynthesis, stomatal conductance, growth, and assimilate partioning of wheat (Triticum aestivum L.)

Title:

Interactive effects of salinity and ozone pollution on photosynthesis, stomatal conductance, growth, and assimilate partioning of wheat (Triticum aestivum L.)

Creator:

Hassan, I. A.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:4afc1f48-f10e-4191-94ca-facbcb6fb64a
uuid:4afc1f48-f10e-4191-94ca-facbcb6fb64a
issn:0300-3604
doi:10.1023/B:PHOT.0000040578.93542.61

Subject:

chlorophyll, ear, NaCl, O3, relative growth rate, shoot/root ratio, and 1 000 grain mass

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Plants of an Egyptian cultivar of wheat (Triticum aestivum L. cv. Giza 63) were exposed in open-top chambers (OTCs) for 8 h d-1 for up to 75 d to a factorial combination of two levels of salinity (0 and 50 mM NaCl) and two levels of O3 (filtered air and 50 mm3 m-3). Exposure to 50 mm3 m-3 O3 significantly decreased stomatal conductance (gs), net photosynthetic rate (PN), and chlorophyll (Chl) content by 20, 25, and 21 %, respectively. This reduction resulted in a change in assimilate allocation in favour of shoot growth leading to a decrease in root to shoot ratio and eventually to a decrease in relative growth rate (RGR) of both root and shoot. There was a very large reduction in yield parameters, especially in the number of ears/plant and 1 000-grain mass. Soil salinity significantly reduced PN and gs by 17 and 15 %, respectively, while Chl content was increased by 17 %. Root growth was decreased leading to an increase in root/shoot ratio. Yield parameters were decreased due to salt stress. There was antagonistic interaction between salinity (50 mM NaCl) and O3 (50 mm3 m-3) showing that salinity effectively protects against the adverse effects of O3 by increasing gs during O3 fumigation.

Language:

Multiple languages

Rights:

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

Coverage:

111-116

Source:

Photosynthetica | 2004 Volume:42 | Number:1

Harvested from:

CDK

Metadata only:

false