scholarly journals Enhancement of Leaf Gas Exchange and Primary Metabolites under Carbon Dioxide Enrichment Up-Regulates the Production of Secondary Metabolites in Labisia pumila Seedlings

Molecules ◽  
2011 ◽  
Vol 16 (5) ◽  
pp. 3761-3777 ◽  
Author(s):  
Mohd Hafiz Ibrahim ◽  
Hawa Z.E. Jaafar
Keyword(s):  
Carbon Dioxide ◽  
Gas Exchange ◽  
Secondary Metabolites ◽  
Leaf Gas Exchange ◽  
Carbon Dioxide Enrichment ◽  
Primary Metabolites ◽  
Labisia Pumila

scholarly journals Flavonoid and Leaf Gas Exchange Responses of Centella asiatica to Acute Gamma Irradiation and Carbon Dioxide Enrichment under Controlled Environment Conditions

Molecules ◽  
2011 ◽  
Vol 16 (11) ◽  
pp. 8930-8944 ◽  
Author(s):  
Sina Siavash Moghaddam ◽  
Hawa Binti Jaafar ◽  
Maheran Abdul Aziz ◽  
Rusli Ibrahim ◽  
Asmah Bt Rahmat ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gas Exchange ◽  
Gamma Irradiation ◽  
Leaf Gas Exchange ◽  
Centella Asiatica ◽  
Controlled Environment ◽  
Carbon Dioxide Enrichment

scholarly journals Shading Effects on Leaf Gas Exchange, Leaf Pigments and Secondary Metabolites of Polygonum minus Huds., an Aromatic Medicinal Herb

Plants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 608
Author(s):  
Fairuz Fatini Mohd Yusof ◽  
Jamilah Syafawati Yaacob ◽  
Normaniza Osman ◽  
Mohd Hafiz Ibrahim ◽  
Wan Abd Al Qadr Imad Wan-Mohtar ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Secondary Metabolites ◽  
Chlorophyll A ◽  
Leaf Gas Exchange ◽  
Photosynthesis Rate ◽  
Total Phenolic ◽  
Chlorophyll B ◽  
Low Light ◽  
Total Anthocyanin ◽  
Polygonum Minus

The growing demand for high value aromatic herb Polygonum minus-based products have increased in recent years, for its antioxidant, anticancer, antimicrobial, and anti-inflammatory potentials. Although few reports have indicated the chemical profiles and antioxidative effects of Polygonum minus, no study has been conducted to assess the benefits of micro-environmental manipulation (different shading levels) on the growth, leaf gas exchange and secondary metabolites in Polygonum minus. Therefore, two shading levels (50%:T2 and 70%:T3) and one absolute control (0%:T1) were studied under eight weeks and 16 weeks of exposures on Polygonum minus after two weeks. It was found that P. minus under T2 obtained the highest photosynthesis rate (14.892 µmol CO2 m−2 s−1), followed by T3 = T1. The increase in photosynthesis rate was contributed by the enhancement of the leaf pigments content (chlorophyll a and chlorophyll b). This was shown by the positive significant correlations observed between photosynthesis rate with chlorophyll a (r2 = 0.536; p ≤ 0.05) and chlorophyll b (r2 = 0.540; p ≤ 0.05). As the shading levels and time interval increased, the production of total anthocyanin content (TAC) and antioxidant properties of Ferric Reducing Antioxidant Power (FRAP) and 2,2-Diphenyl-1-picrylhydrazyl (DPPH) also increased. The total phenolic content (TPC) and total flavonoid content (TFC) were also significantly enhanced under T2 and T3. The current study suggested that P.minus induce the production of more leaf pigments and secondary metabolites as their special adaptation mechanism under low light condition. Although the biomass was affected under low light, the purpose of conducting the study to boost the bioactive properties in Polygonum minus has been fulfilled by 50% shading under 16 weeks’ exposure.

Soybean Leaf Gas‐Exchange Responses to Carbon Dioxide and Water Stress

1994 ◽  
Vol 86 (4) ◽  
pp. 625-636 ◽  
Author(s):  
L. H. Allen ◽  
R. R. Valle ◽  
J. W. Mishoe ◽  
J. W. Jones
Keyword(s):  
Carbon Dioxide ◽  
Water Stress ◽  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Soybean Leaf

Soybean leaf growth and gas exchange response to drought under carbon dioxide enrichment

1999 ◽  
Vol 5 (3) ◽  
pp. 283-291 ◽  
Author(s):  
Rachid Serraj ◽  
L. Hartwell Allen ◽  
Thomas R. Sinclair
Keyword(s):  
Carbon Dioxide ◽  
Gas Exchange ◽  
Leaf Growth ◽  
Carbon Dioxide Enrichment ◽  
Soybean Leaf

scholarly journals Allocation of Secondary Metabolites, Photosynthetic Capacity, and Antioxidant Activity of Kacip Fatimah (Labisia pumilaBenth) in Response toCO2and Light Intensity

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Mohd Hafiz Ibrahim ◽  
Hawa Z. E. Jaafar ◽  
Ehsan Karimi ◽  
Ali Ghasemzadeh
Keyword(s):  
Antioxidant Activity ◽  
Secondary Metabolites ◽  
Light Intensity ◽  
Chlorophyll Content ◽  
Leaf Gas Exchange ◽  
Soluble Sugar ◽  
Negative Relationship ◽  
Plant Secondary Metabolites ◽  
Maximum Efficiency ◽  
Labisia Pumila

A split plot 3 by 4 experiment was designed to investigate and distinguish the relationships among production of secondary metabolites, soluble sugar, phenylalanine ammonia lyase (PAL; EC 4.3.1.5) activity, leaf gas exchange, chlorophyll content, antioxidant activity (DPPH), and lipid peroxidation under three levels of CO2(400, 800, and 1200 μmol/mol) and four levels of light intensity (225, 500, 625, and 900 μmol/m2/s) over 15 weeks inLabisia pumila. The production of plant secondary metabolites, sugar, chlorophyll content, antioxidant activity, and malondialdehyde content was influenced by the interactions between CO2and irradiance. The highest accumulation of secondary metabolites, sugar, maliondialdehyde, and DPPH activity was observed under CO2at 1200 μmol/mol + light intensity at 225 μmol/m2/s. Meanwhile, at 400 μmol/mol CO2 + 900 μmol/m2/s light intensity the production of chlorophyll and maliondialdehyde content was the highest. As CO2levels increased from 400 to 1200 μmol/mol the photosynthesis, stomatal conductance,fv/fm(maximum efficiency of photosystem II), and PAL activity were enhanced. The production of secondary metabolites displayed a significant negative relationship with maliondialdehyde indicating lowered oxidative stress under high CO2and low irradiance improved the production of plant secondary metabolites that simultaneously enhanced the antioxidant activity (DPPH), thus improving the medicinal value ofLabisia pumilaunder this condition.

Leaf gas exchange processes and related characteristics of seven poplar clones under laboratory conditions

1980 ◽  
Vol 10 (3) ◽  
pp. 429-435 ◽  
Author(s):  
R. Ceulemans ◽  
I. Impens
Keyword(s):  
Carbon Dioxide ◽  
Gas Exchange ◽  
Water Use Efficiency ◽  
Water Use ◽  
Leaf Gas Exchange ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Apparent Quantum Yield ◽  
Uptake Rates ◽  
Use Efficiency

Different ecophysiological characteristics of various Populus clones (maximum net CO2 uptake rate, apparent quantum yield, photon flux density compensation point, boundary layer resistance, and stomatal and internal resistances to carbon dioxide and water use efficiency) were studied using a gas exchange method. Most significant differences were found in the water use efficiency ratios, the internal resistances to carbon dioxide and the maximum net CO2 uptake rates. Recently selected interamerican Populustrichocarpa crossings (Populus clones Unal, Beaupré, and Trichobel) showed high water use efficiency, high maximum net CO2 uptake rates, and low internal resistances.

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