Effects of metsulfuron-methyl on aquatic plant (Lemna gibba L.) and recovery from after prolonged exposure under rice cropping conditions

2013 ◽  
Author(s):  
Raja Rajeswari ◽  
Atmakuru Ramesh
Keyword(s):  
Growth Rate ◽  
Chlorophyll A ◽  
Aquatic Plant ◽  
Prolonged Exposure ◽  
Lemna Gibba ◽  
Chlorophyll B ◽  
Total Carotenoid ◽  
Metsulfuron Methyl ◽  
Control Value ◽  
Reliable Assessment

The effects and potential recovery of aquatic plant Lemna gibba exposed to a sulfonyl urea herbicide metsulfuron-methyl (MSM) for 120 days under rice cropping condition was investigated. The frond number was decreased by day 15 at the concentration 11 µg/L and 100% inhibition on growth rate of Lemna was observed. Continuous decrease of frond number by day 50 at below the detectable level of residues exhibited symptoms (chlorosis) of MSM toxicity. Toxicity was assessed on the basis of toxicity index (TI) value, growth rate, yield and pigment contents (chlorophyll, carotene, total carotenoid and xanthophyll) of treated samples compared with untreated control. The observed value of 0.698 µg/g chlorophyll a, 0.263 µg/g chlorophyll b, 0.147 µg/g carotene, 1.620 µg/g total carotenoid and 1.473 µg/g xanthophyll contents in treated samples was statistically significantly different from control value of 4.366 µg/g chlorophyll a, 3.132 µg/g chlorophyll b, 0.796 µg/g carotene, 17.755 µg/g total carotenoid and 16.937 µg/g xanthophyll contents by day 50 samples. After prolonged exposure, growth rate, yield and pigment content for the treated samples recovered to control levels on day 120. The obtained data indicate the application of aquatic plant Lemna gibba as sensitive biomarker of water quality as well as the significance of selected biological parameters in the reliable assessment of toxic potential of MSM under rice cropping condition.

scholarly journals Effect of nicosulfuron on chlorophyll content of marandu-grass cultivated in crop-forest-livestock integration systems

2020 ◽  
pp. 1876-1882
Author(s):  
Evander Alves Ferreira ◽  
Marcia Vitória Santos ◽  
Leandro Diego da Silva ◽  
Priscila Júnia Rodrigues da Cruz ◽  
Raul Ribeiro Silveira ◽  
...  
Keyword(s):  
Growth Rate ◽  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Dry Matter ◽  
Agroforestry Systems ◽  
Chlorophyll B ◽  
Total Chlorophyll ◽  
Integration System ◽  
Total Chlorophyll Content ◽  
Urochloa Brizantha

The aim of this work was to study the effect of sub-doses of herbicide nicosulfuron on the levels of chlorophyll and growth of marandu-grass in an forest-livestock integration system. The treatments consisted of eucalyptus consortium with sorghum (BRS 655 hybrid) and forage Urochloa brizantha cv. Marandu (marandu-grass) at 12×2 and 12×3 m spacings in agroforestry systems, in addition to sorghum + marandu-grass and marandu-grass in monoculture. The doses of nicosulfuron applied at the marandu-grass were 0, 15 and 30 g ha-1. At 30 and 120 days after the application of nicosulfuron, chlorophyll a and chlorophyll b were measured usinf a portable chlorophyll meter, with six measurements per plant. Afterwards, the total chlorophyll content and chlorophyll a/b were calculated. We also measured the mass of the total dry matter of marandu-grass and growth rate of the culture. Marandu-grass plants cultivated in monoculture showed higher quantities of chlorophyll and the highest growth rates. The levels of chlorophyll a, b and chlorophyll a/b and the growth rate of marandu grass were similar between systems integrated with eucalyptus (12x2 and 12x3 m). The increase of herbicide dose negatively influenced on chlorophyll content in marandu-grass in all treatments evaluated. The use of nicosulfuron in doses of 25 and 50 g L-1 reduced the growth rate of marandu grass only when grown in monoculture

scholarly journals Comparative effect of synthetic plant growth regulators for assimilation processes and productivity of cucumber (Cucumis sativus l.). cultivar Nizhynsky

2021 ◽  
Vol 1 (98) ◽  
pp. 142-150
Author(s):  
V. M. Gaviy ◽  
S. O. Pryplavko
Keyword(s):  
Chlorophyll A ◽  
Leaf Blade ◽  
Agricultural Practice ◽  
Chlorophyll B ◽  
Cucumis Sativus L ◽  
Control Value ◽  
Flowering Phase ◽  
Open Ground ◽  
Chlorophyll A And B ◽  
Synthetic Growth

Cucumbers are a common vegetable crop in the world, so increasing its yield is an urgent issue. The effect of Rival and Rist-concentrate on the assimilation processes of cucumber in the phases of three true leaves and flowering in the open ground was studied. It was found that in the phase of three true leaves, pre-sowing treatment of cucumber seeds with Growth-Concentrate increased the value of the area of the cucumber leaf blade by 12.2 % compared to the control indicators. In the flowering phase, Rival and Rist-concentrate showed higher efficiency, stimulating the growth of the area of the cucumber leaf blade by 13.1 % and 16.7 % compared to the control indicators. Studies of the total area of the leaf apparatus of cucumber in the phase of three true leaves showed that the values of the area of the leaf apparatus of cucumber, the seeds of which were treated with Rival and Rist-concentrate exceed control by 34.8 % and 27.8 %, respectively. In the flowering phase, Rival and Growth-concentrate stimulated an increase in the area of the leaf apparatus by 21.4 % and 25.6 % compared to the control indicators. It was found that after measuring the content of chlorophyll in the tissues of cucumber leaves in the phase of three true leaves, the control value for the sum of chlorophyll а and b was 2.32 mg/g of raw mass, chlorophyll a – 1.51 mg/g of raw mass, chlorophyll b is 0.81 mg/g of raw weight. Treatment of cucumber seeds with the drug Rival allowed to increase the content of the sum of chlorophyll a and b to 2.53 mg/g of raw weight. Also, this drug affected the content of chlorophyll b, exceeding the control value by 12.5 %. In this phase, Growth Concentrate did not change the content of photosynthetic pigments in the tissues of cucumber leaves. It was found that the control value for the content of the sum of chlorophyll a and b in the tissues of cucumber leaves in the flowering phase was 2.82 mg/g of raw weight, chlorophyll a – 1.80 mg/g of raw weight, chlorophyll b – 1.01 mg/g raw mass. Treatment of cucumber seeds with Rival increased the amount of chlorophyll a and b to 4 mg/g of raw weight. Also, the drug stimulated the formation of chlorophyll a and b. It was investigated that pre-sowing treatment of cucumber seeds with the drug Rival increases the yield by 22 %, which indicates the effectiveness of this drug. Thus, the synthetic growth regulator Rival can be recommended for use in agricultural practice for pre-sowing treatment of cucumber seeds

scholarly journals Growth and Total Carotenoid, Chlorophyll a and Chlorophyll b of Tropical Microalgae (Isochrysis sp.) in Laboratory Cultured Conditions

2012 ◽  
Vol 13 (1) ◽  
pp. 10-17 ◽  
Author(s):  
K.C.A. Jalal ◽  
A.A. Shamsuddin ◽  
M.F. Rahman ◽  
N.Z. Nurzatul ◽  
M. Rozihan
Keyword(s):  
Chlorophyll A ◽  
Chlorophyll B ◽  
Total Carotenoid

Etude sur la teneur en pigment de frênes qui croissent dans des conditions différentes

1973 ◽  
Vol 37 ◽  
Author(s):  
N. Lust
Keyword(s):  
Chlorophyll A ◽  
Strong Influence ◽  
The Other ◽  
Pigment Content ◽  
Chlorophyll B ◽  
Light Quantity ◽  
Yellow Pigments ◽  
The One ◽  
Green Pigments

Pigment content of ashes grown up under different circumstances - The pigment content (chlorophyll a, chlorophyll b,  xanthophyll and carotene) has been researched with ashes grown up under  different light circumstances and varying in age and height.     The results prove that the general laws concerning the influence of light  on the pigment content, don’t always work.     The phenomen is very complex. The light quantity is very important in some  cases, but insignificant in others. It seems origin and height of plants have  a strong influence. The results prove also the influence of the environment  is much higher on small plants as on big ones.     The research indicates finally the correlation between the green pigments,  the yellow pigments, and between the green pigments on the one side and the  yellow ones on the other side.

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.

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