Elevated CO2 increased photosynthesis and yield without decreasing stomatal conductance in broomcorn millet

Title:

Elevated CO2 increased photosynthesis and yield without decreasing stomatal conductance in broomcorn millet

Creator:

Hao, X. Y., Li, P., Li, H. Y., Zong, Y. Z., Zhang, B., Zhao, J. Z., and Han, Y. H.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:371985d2-7e71-4b19-a2b5-cc02ffb3bfce
uuid:371985d2-7e71-4b19-a2b5-cc02ffb3bfce
issn:0300-3604
doi:10.1007/s11099-016-0226-6

Subject:

fluorescence chlorofylu, výměna plynu, obohacování o CO2, efektivita využívání vody, proso seté, chlorophyll fluorescence, CO2 enrichment, gas exchange, water-use efficiency, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

Broomcorn millet (Panicum miliaceum L.) is one of the important C4 crops in the semiarid regions of northern China. It is a close relative of biofuel crop switchgrass. Yet, there is no information on how these crops might respond to a climate change in China. In order to gain insight into such a response, we studied the effect of elevated CO2 concentration (EC) on broomcorn millet. The changes in leaf photosynthesis, chlorophyll fluorescence, morphological parameters, biomass and yield in response to EC [i.e., + 200 µmol(CO2) mol-1] over two years were determined at the open-top chamber (OTC) experimental facility in north China. EC increased net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, transpiration rate, instantaneous transpiration efficiency, effective quantum yield of PSII photochemistry, and photochemical quenching coefficient of fully expanded flag leaves. Maximal quantum yield of PSII photochemistry declined under EC in 2013, but was not affected in 2014. EC significantly decreased intrinsic efficiency of PSII in 2013, but increased in 2014. Leaf nonphotochemical quenching decreased under EC both in 2013 and 2014. EC significantly enhanced the aboveground biomass and yield by average of 31.4 and 25.5% in both years, respectively. The increased yield of broomcorn millet under EC occurred due to the enhanced number of grains per plant. We concluded that photosynthesis of broomcorn millets was improved through increased stomatal conductance in leaves under EC, which led to an increase in height, stem diameter, aboveground biomass, and yield. This study extends our understanding of the response of this ancient C4 crop to elevated CO2 concentration., X. Y. Hao, P. Li, H. Y. Li, Y. Z. Zong, B. Zhang, J. Z. Zhao, Y. H. Han., and Obsahuje bibliografii

Language:

Multiple languages

Rights:

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

Coverage:

176-183

Source:

Photosynthetica | 2017 Volume:55 | Number:1

Harvested from:

CDK

Metadata only:

false