Turnera Ulmifolia Research Articles

Fungitoxic effect and phytochemical characteristics of Brazilian Cerrado weeds against Rhizoctonia solani and Macrophomina phaseolina fungi.

The use of natural products obtained from plants, for example, invasive plants, offers a variety of allelochemicals with fungicidal potential. With this in perspective, the objective was to evaluate the fungicidal potential of ethanolic extracts of Cerrado plants on Rhizoctonia solani and Macrophomina phaseolina. The ethanolic hydroalcoholic extract of the 12 plants identified as invaders in the Brazilian Cerrado was prepared (Anacardium humile Saint Hill; Baccharis dracunculifolia DC.; Cenchrus echinatus L; Commelina erecta L.; Erigeron bonariensis L.; Digitaria horizontalis Willd.; Digitaria insularis L.; Porophyllum ruderale Jacq. Cass; Richardia brasiliensis Gomes; Sida rhombifolia L.; Turnera ulmifolia L.; Smilax fluminensis Steud)) and phytochemical screening and determination of total phenols and flavonoids were performed. To evaluate the in vitro antifungal activity, the hydroalcoholic solutions at concentrations of 800, 1200, 1600, 2000, and 2400 µL 100 mL-1 were separately incorporated into BDA agar and poured into Petri dishes, followed by the mycelium disk of the fungus. As a control, two solutions were prepared, one ethanolic solution added to the BDA medium (2400 µg 100 mL-1) and the other with BDA medium only. They were poured into Petri dishes, followed by a 0.5 cm diameter disk of mycelium of the fungus, incubated (23±2 ºC), with a 24-hour photoperiod. Among the constituents found in the plants, 75% are phenolic compounds, 58.3% are cardiotonic heterosides, 50% are steroids, 33.3% are flavonoids, 16.7% are anthraquinones, and 8.3% are alkaloids, saponins, and reducing sugars. Out of the 12 species, only the extracts of C. erecta and R. brasiliensis were active for M. phaseolina and R. solani. Thus, it is concluded that the ethanolic extract of C. erecta has the fungicidal potential to control diseases caused by fungi that are soil inhabitants. Of the other species, A. humille, B. dracuncufolia, D. insulares, C. erecta, D. insulares, P. ruderale, and R. brasiliensis have natural fungitoxic potential because they stand out in the content of polyphenols efficient in reducing the mycelial growth of M. phaseolina and R. solani.

Perilaku Bunga Pukul Delapan (Tunera ulmifolia) Akibat Perlakuan Pemotongan Daun Dan Naungan

Sycanus is a UPDPKS predator that stays and gets food from the eight o'clock flower (Turnera ulmifolia). This study aims to determine the behavior of the eight o'clock flower due to leaf cutting and shading and its relationship with air temperature, air humidity and light intensity. This research is an experimental research, there are two treatment factors, factor 1 is leaf cutting and without cutting, factor 2 is without shading, 50% shading and 100% shading. Parameters observed were the duration of flower blooming, daily behavior of flowers, interval (duration) of flower bud blooming and weather conditions. The results showed that the eight o'clock flower without treatment experienced full bloom at 08.17 WIB and perfect bud at 13.32 WIB with a blooming duration of 4 hours 17 minutes. The process of blooming and buds takes longer in the treatment of 100% shading. Air temperature in the treatment without shade and 50% shade increased in temperature 30 minutes before the flowers bloomed and 30 minutes after the flowers experienced full bud with a maximum temperature of 35.8oC. The effect of microclimate in each treatment on blooming behavior was marked when the air temperature and light intensity increased followed by a decrease in air humidity and would bud again when the air temperature and light intensity were higher and the air humidity was lower.

Effect of Present and Treated Turnera ulmifolia L. on Bagworm and Natural Enemies Population in Oil Palm Plantation

Bagworm is the most serious threat to Malaysia's oil palm industry, causing up to 40% crop loss after two years of defoliation. In response to the concomitant decrease in pesticide use, nectariferous plants such as Turnera ulmifolia are increasingly being planted as biological control for bagworm. To fill in the knowledge gap, studies were conducted to determine the effects of field fertiliser application on nectar and flowering of T. ulmifolia and its subsequent effect on parasitoid and bagworm population. Treatments T1 (0.2 g NPK) and T2 (0.2 g NPK + 3.9 g silicon) from semi trial study were further tested on a ten-year-old oil palm plantation in the Samarahan area with a moderate infestation of Metisa plana since early 2017. Data on the number of bagworms and natural enemies were collected weekly during two sampling rounds (February to March and August to September 2020). All data were subjected to Analysis of Variance (ANOVA) using the Statistical Analysis System (SAS) and means for significant treatment effects were separated by LSD tests at a P<0.05 significance level. Improvement in the number of flowers and nectar value was observed seven months after T. ulmifolia was administered with 0.2 g NPK. Consequently, increasing the amount of food is available to parasitoids. As a result, bagworm parasitism, and thus bagworm mortality was higher in the 0.2 g NPK and with silicon plot. The number of live bagworms was greatly reduced in plots with the presence of T. ulmifolia supplied with 0.2 g NPK compared to plots without co-plantation of T. ulmifolia. Fertiliser application positively affected the flowering, and nectar of T. ulmifolia.

Identification of <i>Sida rhombifolia</i> from Its Related Plants Using Thin-Layer Chromatographic Analysis

Sida rhombifolia belongs to the Malvaceae family and is often used to treat gout in Indonesia. S. rhombifolia has many efficacies and contains many different chemical components. The abundance and variation of chemical content and chemical compounds in this medicinal plant are challenging factors in ensuring medicinal plants' safety and quality control. Thin-layer chromatography (TLC) fingerprint analysis derived from S. rhombifolia extract can also be used for the medicinal plant's quality control. This research aimed to develop the optimum condition for the chemical fingerprint analysis of S. rhombifolia using a TLC fingerprint analysis. A total of 11 bands were produced with optimum separation using silica gel 60 F254 TLC plate, a mixed mobile phase condition with chloroform, ethyl acetate, and methanol (6.5:2:1.5). This fingerprint analysis performed an excellent separation in the TLC plate at 366 nm with sulfuric acid as reagent derivatization. In general, the results of the analysis validation, including stability, specificity, precision, and robustness of TLC fingerprints, met the acceptance criteria. The TLC fingerprint of S. rhombifolia can be distinguished from 2 related plants with similar leaf shapes, Turnera ulmifolia L. and Hibiscus rosa-sinensis. The developed method was validated, so it could be used to control S. rhombifolia quality.

Multigene analyses for identification of phytoplasma strains infecting Dimorphandra gardneriana and Turnera ulmifolia in Brazil

Multigene analyses for identification of phytoplasma strains infecting Dimorphandra gardneriana and Turnera ulmifolia in Brazil

Genetic architecture of multiple mutualisms and mating system in Turnera ulmifolia.

Plants often associate with multiple arthropod mutualists. These partners provide important services to their hosts, but multiple interactions can constrain a plant's ability to respond to complex, multivariate selection. Here, we quantified patterns of genetic variance and covariance among rewards for pollination, biotic defence and seed dispersal mutualisms in multiple populations of Turnera ulmifolia to better understand how the genetic architecture of multiple mutualisms might influence their evolution. We phenotyped plants cultivated from 17 Jamaican populations for several mutualism and mating system-related traits. We then fit genetic variance-covariance (G) matrices for the island metapopulation and the five largest individual populations. At the metapopulation level, we observed significant positive genetic correlations among stigma-anther separation, floral nectar production and extrafloral nectar production. These correlations have the potential to significantly constrain or facilitate the evolution of multiple mutualisms in T.ulmifolia and suggest that pollination, seed dispersal and defence mutualisms do not evolve independently. In particular, we found that positive genetic correlations between floral and extrafloral nectar production may help explain their stable coexistence in the face of physiological trade-offs and negative interactions between pollinators and ant bodyguards. Locally, we found only small differences in G among our T.ulmifolia populations, suggesting that geographic variation in G may not shape the evolution of multiple mutualisms.

Antiglycation, antioxidant and cytotoxicity activities of crude extract of Turnera ulmifolia L. before and after microencapsulation process

Turnera ulmifolia L. is used in folk medicine and it is known to have anti-hyperglycemic effect on the organism in order to reduce complications in diabetic patients. Glycation process is directly related to oxidative stress, acting as an important endogenous source, inducing the production of free radicals, and thus increasing the production of reactive oxygen species. The encapsulation technology on natural compounds can minimize and even mitigate the risk of loss of biological activity in order to maintain their activities against oxidative stress and glycation. The present study aimed to evaluate the antiglycation and antioxidant activities of T. ulmifolia extract before and after encapsulation and cytotoxicity of the crude extract. This study presents important information about the biological activities, highlighting antioxidant and antiglycation potential and no cytotoxicity of Turnera ulmifolia crude extract, a species of genus Turnera that has been poorly studied. T. ulmifolia crude extract presented flavonoids as main active compounds. The results showed a promising activity in scavenging free and peroxyl radicals, chelating iron ions and inhibiting BSA glycation. In addition, this study showed the possible encapsulation of bioactive compounds using maltodextrin as wall material.

Pollen Diversity of Sri Ram Narayan Khedia Government Degree College Banswada, Kamareddy District, Telangana State, India

The present paper study on the study of pollen diversity of 31 plants from various gardens of Sri Ram Narayana Khedia Government Degree College Banswada, Kamareddy district, Telangana state, India. These plants some are medicinal, ornamental and tree members. The pollens of these plants have diversity of morphological characters viz., symmetry, shape, polarity, aperture patterns and sculpture. In the present study, a total of 31 plant species belongs to 19 families. The plants with Spheroidal shape pollen Catharanthus roseus, Lantana camara, Bougainvillea spectabilis, Tridax procumbens, Pseuderanthamum, Ixora coccinea, Jasminum sambac, Hibiscus rosa-sinensis, Pulmeria alba, Euphorbia heterophylla, Cynodon dactylon, Ghompherna celosioides, Hibiscus syriacus, Tecomaria capensis, Turnera ulmifolia, Punica grantum , Cleome gynandra, Oxalis dilenii, Nerium oleander, Ghompherna globosa, Datura stramonium, Jatropa integrerrima, Cyanthillium cinereum, Delonix regia, Tecoma stans . The plants with Symmetrical pollen is Parthenium hysterophorus. The plant with Irregular pollen shape is Callaindra. The plants with Cylindric pollen shape Bauhinia racemosa, Crossandra infundibuliformis. The plant with Boat shaped pollen is Hymencallis littoralis, are repotted. This plant species diversity record which is helps to the identification of Indian pollen flora.

Effect of Several Flowering Plants on Diversity and Populations of Pests and Natural Enemies in Cayenne Pepper (Capsicum frutescens)”

ABSTRACT
 
 One of the causes of pest problems that dominate in cayenne pepper is the monoculture planting system. Monoculture cropping systems have a lower diversity of pests and natural enemies in the field compared to polycultures. imbalance in the ecosystem in a crop, causing insect pests to become more resistant and dominate. Utilizing flowering plants is one of the efforts to maintain the balance of the existing ecosystem in the cayenne pepper plantation. The purpose of this study was to determine the effect of flowering plant species on the population and diversity of pests and natural enemies of cayenne pepper, then find out what treatment is the most effective for reducing pest populations. This research was conducted from August to December 2021 on land located in Gebang Village, Southeastang District, Bondowoso. The research design used was a randomized block design (RAK) with several treatments including P0 (Control), P1 (Sesamum indicum), P2 (Sphagneticola trilobata), P3 (Turnera subulata) and P4 (Turnera ulmifolia). The observed variables were the population of pests and natural enemies, the diversity of pests and natural enemies. The results showed that several types of flowering plants had an influence on Arthropoda diversity in cayenne pepper plants with a moderate category, the population of pests and natural enemies showed significantly different results in several weeks. The most effective treatment that can reduce pests is P3 (Turnera subulata) treatment which can reduce the pest population of B. dorsalis and show the highest population of its natural enemy, Oxyopes.
 

Effect of NPK and silicon fertilizer on growth, flowering, and nectar of Turnera ulmifolia L.

Turnera ulmifolia L. is a beneficial plant mostly planted in the oil palm plantation as it is easily adapting to a variety of environmental conditions, mainly to conserve beneficial insects. Nevertheless, the planted plants were left without proper maintenance and less study was conducted on biological control agent conservation. Thus, this study aimed to examine the effect of NPK, silicon fertilizer and their combination on the growth and development of T. ulmifolia. Treatments including T0 Control (No fertilization application), T1 (0.2 g NPK), T2 (0.2 g NPK+3.9 g silicon), T3 (0.2 g NPK+4.9 g silicon), T4 (3.9 g silicon) and T5 (4.9 g silicon) were applied 20 days after transplanting at monthly interval for three months. Results revealed the greatest height and number of branches were observed in T1. Overall, the chlorophyll content ranged between 27.92 to 31.18 SPAD values. All treatments gave the same effect on morphometric measurements on the first 30 days of observation. After 60 days, the greatest value for broad tube width and length was observed in T4 which differs significantly from other treatments. The application of fertilizer in T1, T2 and T3 showed 10-20% promotive effects over the control in the amount of nectar produced per flower. For all three observation periods, a similar trend was recorded for the total sugar concentration in flowers, where the mean total sugar content was between 1.37 and 1.61 mg per flower.

Caracterização do perfil fitoquímico das flores de Turnera ulmifolia L. (Chanana)

A chanana (Turnera ulmifolia L.) é uma planta herbácea, nativa da América tropical, África, Índia e Sudeste da Ásia, com ampla distribuição geográfica nas regiões do nordeste do Brasil. A planta é bastante utilizada pela medicina popular, sendo suas flores usadas para o tratamento de lesões da pele e processos inflamatórios. Em vista da escassez de estudos relacionados à composição fitoquímica de suas flores, este estudo experimental teve como objetivo analisar o perfil fitoquímico das flores de T. ulmifolia, através de métodos qualitativos de detecção fitoquímica. O estudo foi desenvolvido por meio da análise de dois extratos, um aquoso (EAFC) e outro hexânico (EHFC), aplicando-se a maceração como método de extração. Os resultados demonstraram que as flores da chanana possuem uma variedade de metabólitos secundários, como alcalóides, esteróides, triterpenóides, antocianidinas, chalconas, cumarinas, flavonóides e taninos. Entre os extratos analisados, o EAFC mostrou ser mais rico em compostos fitoquímicos em comparação ao EHFC. O estudo demostrou que as flores são ricas em metabolitos secundários relevantes, os quais podem estar diretamente relacionados às suas propriedades medicinais descritas pelo uso popular. Além disso, esta pesquisa evidenciou a presença de compostos ainda não detectados em estudos relacionados à composição química da espécie, como triterpenos, antocianidinas e chalconas.

Effect of pollen of different plant species on the oviposition of two phytoseiid mites (Acari: Phytoseiidae) commonly found in citrus orchards in the Brazilian Amazonia

The suitability of the use of pollen to foster the control of citrus pests by facilitating the maintenance of predatory mites in the area has been extensively studied. The aim of this study was to evaluate the effect of pollen of 13 plant species commonly found in Manaus region (Brazilian Amazonia) on the oviposition of Amblyseius aerialis and Iphiseiodes zuluagai, phytoseiid species abundant in citrus orchards in that region. The study was conducted under laboratory conditions, using mostly pollen grains recently collected in the field. For comparison, a commercially available pollen (ECOPolen) and pollen obtained from two bee species were also included in the study. For about 65% of the evaluated pollen types, the average oviposition was low (less than 0.4 egg/female/day). These differed from other pollen types by the speculate wall (sunflower) or high hygroscopic property (Agave sp., Amaryllis sp., Citrus sinensis, Helianthus annuus and Turnera ulmifolia), or were collected by Apis mellifera. Highest oviposition levels of A. aerialis were obtained on pollen of Typha dominguensis, Elaeis guineensis, Cocos nucifera and the commercial pollen (1.9, 1.5, 0.9 and 0.9 eggs/female/day, respectively). For I. zuluagai, highest levels of oviposition were obtained on E. guineensis, C. nucifera, T. dominguensis, and Elaeis oleifera (1.6, 1.5, 1.2 and 0.9 egg/female/day, respectively). These results suggest that C. nucifera, E. guineensis and E. oleifera, found in the vicinity of citrus orchards in Manaus region, may play a role in maintaining predatory mite populations in such orchards. Complementary studies are needed to investigate the feasibility of maintaining those plants near orchards to increase the abundance of the predators.

Improved micropropagation and foliar micromorphological studies in Turnera ulmifolia L. – An important medicinal plant

Abstract The present study reports an efficient in vitro propagation system for Turnera ulmifolia using nodal segments as explants. Turnera ulmifolia (Passifloraceae) is an important garden plant with multipotent medicinal values. Effective shoot proliferation was achieved on agar gelled MS medium (Murashige and Skoog, 1962). The maximum number of shoots (8.3 ± 0.57) per initial explant was obtained on MS medium supplemented with 8.88 mM of 6-benzylaminopurine (BAP) and 0.54 mM of α-naphthalene acetic acid (NAA). The highest number of shoots (59.5 ± 2.10) proliferated on semi-solid MS medium (with agar) augmented with 2.22 mM of BAP and 2.32 mM of kinetin (Kin) along with 0.54 mM of NAA. Longer (4-5 cm) and healthy shoots were rooted (12.0 ± 0.10 roots per shoot) on half-strength MS medium fortified with 9.84 mM of indole-3 butyric acid (IBA). The in vitro regenerated plantlets were hardened in the greenhouse and transferred to the field. Significant developmental changes were observed in the foliar micromorphology of in vitro raised plantlets when these were transferred to the field. The stomatal index was gradually reduced (26.72 to 21.25) in the leaves from in vitro to field environments. But, vein-islets and veinlet terminations (13.4 and 7.6) were increased (39.7 and 18.4) respectively from in vitro to in vivo grown plants. Simple, unicellular, less frequent and underdeveloped trichomes were observed with the leaves of in vitro plants but fully developed trichomes recorded in the field transferred plants. The study could help in understanding the response and adaptation of tissue culture raised plantlets towards changed environmental conditions.

Diversity of Phytophagous and Entomophagous Insect on Yellow Alder Flower (Turnera subulata J.E SM and Turnera ulmifolia L.) Around the Palm Oil (Elaeis guineensis J.) Plantations

Yellow alder flower, with Indonesian name bunga pukul delapan, can influence the existence of phytophagous and entomophagous insect around any crops. The existence of these phytophagous and entomophagous insects would affect the diversity of predator and parasitoid insect species that come to these crops. This research was aimed to study the role of yellow alder flower in their influence of the presence of predatory and parasitoid insect that active in the Turnera subulata dan Turnera ulmifolia. The research was conducted at July to August 2017 in palm oil planta tion of PT. Tania Selatan branch Burnai Timur 1. The results showed that phytophagous insect found in the yellow alder flower belonging to 6 orders and 25 families. Meanwhile for the entomophagous insect, it was belonging to the 7 orders and 15 families. The diversity index in Turnera subulate and Turnera ulmifolia was in range of 0.063 and 2.912 or higher than 2. The dominant index was low (in range of 0.091 to 0.125) and the evenness index was high enough in range 0.738 – 0.752.

THE EXISTENCE SPESIES OF PASSIONFLOWER (Turnera subulata J.E SM. AND Turnera ulmifolia L.) ON PALM OIL PLANT (Elaeis guineensis J.) AGAINST TO THE DIVERSITY OF ENTOMOFAG AND PHYTOPHAGE INSECTS

The research was purposed to inventory and identification types of entomofag and phytophage insects on Passionflower Flower Plants in the area of PT. South Tania Branch East Burnai I. The area of research in PT. Tania Selatan East Iango Branch I is ± 20 hectares, dominated by two species of Passionflower Flower, there are Passionflower Yellow Flower (Turnera subulata J.E SM.) and Passionflower White Flower (Turnera ulmifolia L.). Entomofag and phytophage insects were collected using d-vaccum, and sweep net in every kind of Passionflower Flowers, started July until August 2017. The identification of entomofag and phytophage insects were done in the University of Sriwijaya Postgraduate Laboratory. The results of the study were 8 orders, 34 families and 48 species on Turnera subulata plants, and 9 orders, 26 families, 36 species on Turnera ulmifolia plants. The value of diversity index from entomofag and phytophage insects in Turnera subulata were 2.912 plant and the value of diversity index from entomofag and phytophage insects in Turnera subulata plants were 2.603.

Yellow colored blooms of Argemone mexicana and Turnera ulmifolia mediated synthesis of silver nanoparticles and study of their antibacterial and antioxidant activity

In the present work, AgNPs were prepared using a simple bio-reduction method. This is ecologically welcoming and cost-effective method. Yellow colored blooms concentrate of Argemone mexicana and Turnera ulmifolia are used as bio reducing agents in the study. The formation of silver nanoparticles was confirmed by UV–Vis spectrophotometer and characterization of the nanoparticles was done by FTIR, SEM, XRD and EDX. The Antibacterial action of silver nanoparticles was tested against Staphylococus aureus, Pseudomonas aeruginosa, Escherichia coli and Klebsiella aerogenes. The phytochemical analysis of the blooms concentrate has shown the existence of saponins, alkaloids, amino acids, phenols, tannins, terpenoids, flavonoids and cardiac glycosides. In vitro anti-oxidant action of both A. mexicana and T. ulmifolia AgNPs were studied by DPPH assay and reducing power assay.

Extrafloral nectar increases seed removal by ants in Turnera ulmifolia

AbstractTo investigate whether extrafloral nectar (EFN) increases seed dispersal in Turnera ulmifolia, we measured seed removal on plants with and without EFN. Plants producing EFN had more seeds removed than control plants, suggesting that EFN does play a role in seed dispersal. This is a novel function of EFN.

Effect of Pollen Feed on Parasitization and Predatism of Cephalonomia stephanoderis onHypothenemus hampei

Biological control of the coffee berry borer (Hypothenemus hampei)using parasitoid Cephalonomia stephanoderishas been developed through the improvement of the parasitoid role may using pollens as feed source. The objective of this study was to investigate the effect of cover crop and weed pollens on parasitization and predatism of C. stephanoderis.The applied treatments were pollens of Turnera ulmifolia, Arachis pintoi, Ageratum conyzoidesadded in glass tube that consist of 10 CBB pupaes and a mated female of C. stephanoderis. Number of pupae parasitized and pupae preyed were observed. The result showed that addition of A. Pintoi pollen increased the number of pupae parasitized at 135% whereas addition of T. ulmifolia and A. conyzoides pollens did not affect parasitization of C. Stephanoderis. The predatismof C. stephanoderiswas higher than parasitization to pupae of H. hampei which showed that the behavior of C. stephanoderiswas parasitization. Addition of T. ulmifolia, A. pintoi, and A. conyzoidespollens increased the number of pupae predatism at 132%, 102%, and 225%, respectively. Key words: Ageratum conyzoides, Arachis pintoi, Cephalonomia stephanoderis, Hypothenemus hampei,parasitization, predatism, pollens, Turnera ulmifolia

An Efficient Micropropagation Protocol for High-Frequency Plantlet Regeneration from Liquid Culture of Nodal Tissues in a Medicinal Plant, Turnera ulmifolia L.

A highly efficient, stable, and cost-effective micropropagation protocol for the conservation of a medicinal plant Turnera ulmifolia L. was established from nodal tissues via multiple axillary shoot proliferation on using Murashige and Skoog’s (MS) liquid nutrient medium. To begin with, nodal explants were placed on agar gelled medium amended with 2.0 mg L−1 6-benzylaminopurine (BAP) and 0.1 mg L−1 indole-3 acetic acid (IAA) for shoot induction. Subsequently, elongation of regenerated shoots could be possible on liquid MS medium supplemented with 0.5 mg L−1 BAP and Kin (kinetin) each along with 0.1 mg L−1 IAA where high frequency of regeneration in terms of number of shoots (47.2 shoots/explant) was achieved. Furthermore, long and healthy shoots (4−5 cm in length) were rooted on agar gelled half-strength of MS medium supplemented with 2.0 mg L−1 indole-3 butyric acid (IBA). Finally, in vitro regenerated plantlets were gradually acclimatized in the greenhouse and transferred to the field successfully.

Whole-plant profiling of total phenolic and flavonoid contents, antioxidant capacity and nitric oxide scavenging capacity of Turnera subulata

Turnera subulata is a medicinal plant used as an herbal remedy for coughs and bronchitis. Unlike two other members of the genus, Turnera diffusa and Turnera ulmifolia, which dominate the ethnopharmacological and pharmacological literature, very little is known about the bioactive properties of T. subulata. In this study, whole-plant profiling of the total phenolic and flavonoid contents as well as antioxidant capacity of T. subulata was accomplished by analysing the leaf, stem, root, fruit and flower extracts. Analyses of total phenolic and flavonoid contents, free radical scavenging activity and ferric reducing ability revealed that the leaf extract had the highest antioxidant potential. Comparison of total phenolic contents and antioxidant parameters between T. subulata leaf extract and the extracts of other medicinal plants also indicated T. subulata to be a rich source of antioxidant activities. Strong, positive correlations were found between total phenolic and flavonoid contents and three antioxidant parameters, namely Trolox equivalent antioxidant capacity (TEAC), ferric reducing antioxidant power (FRAP) and nitric oxide scavenging activity. Our results indicate that the total pool of phenolic compounds, including flavonoids, in the T. subulata extracts were capable of both scavenging free radicals and reducing oxidants. Key words: Ferric reducing antioxidant power, flavonoids, free radical scavenging activities,nitric oxide, phenolics, trolox equivalent antioxidant capacity, Turnera subulata.