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Prabhu T.,Horticulture College and Research Institute | Deb A.K.,Forest Research Division | Prakash J.,Indian Agricultural Research Institute
Acta Horticulturae | Year: 2013

Tripura is a tiny hilly state, located in the north-eastern part of India. The state has an abundance in valuable medicinal plants, naturally growing mostly in hilly area and the agroclimatic conditions favour the diverse medicinal plants and the area is considered to be a hot-spot of indigenous medicinal plants. Hence, more than 270 plant species have been identified, which are being used by local tribal people in treating various ailments. The important indigenous and tribal medicinal plant species available are Terminalia chebula, Tarminalia bellirica, Phyllanthus emblica, Terminalia arjuna, Adhatoda zeylanica, Alpinia galangal, Asteracantha longifolia, Eryngium foetidum, Centella asiatica, Phyllanthus amarus, Leucas aspera, Lawsonia inemis, Heliotrapium indcum, Datura stamonium, Coccimia indica, Cissus quadrangularis, Asparagus racemosus, Azadirachta indica, Bacopa monnieri, Mucuna pruirens, Piper longum, Acorus calamus, Aegle marmelos, Aloe barbadensis, Tinospora cordifolia, Andrographis paniculata, Boerhaavia diffusa, Byayphlium calycinum, Catharanthus roseus, Dillenia indica, Dioscorea (D. alata, D. floribunda, D. bulbifera, D. esculenta and D. hamiltonia), Ocimum sanctum, Rauvolfia serpentine, Sida cordifolia, Solanum spp., Withania somnifera, Mentha arvensis, Vitex negundo and others tribal medicinal plants. The tribal peoples of the state are familiar with the medicinal properties of locally available medicinal plants that are used for common ailments. This paper focusses on the potential of indigenous and tribal medicinal plants as a medicinal value and their utility for tribals and in the interior area of the state. Source


Premkumar G.,Virudhunagar Hindu Nadars Senthikumara Nadar College | Sankaranarayanan R.,Horticulture College and Research Institute | Jeeva S.,Center for Biodiversity and Biotechnology | Rajarathinam K.,Virudhunagar Hindu Nadars Senthikumara Nadar College
Asian Pacific Journal of Tropical Biomedicine | Year: 2011

Objective: To develop an improved protocol for micropropagation of ethnomedicinally important Scoparia dulcis (S. dulcis) L. Methods: Explants were inoculated on MS basal medium supplemented with kinetin and 6-benzylaminopurine for shoot bud induction. To enhance the shoot induction, various auxins like 3-indoleacetic acid or 3-indolebutyric acid or α-naphthylacetic acid were tested along with 2.32 M KI and 4.44 μM BAP. The regenerated shoots were rooted in half strength MS medium supplemented with various concentrations of IAA, IBA or NAA. After roots were developed, the plantlets were transplanted to pots filled with vermiculate and sand and kept in growth chamber with 70%-80% humidity under 16 h photoperiod. After acclimatization, the plantlets were transferred to the garden and survival percentage was calculated. Data were statistically analyzed and means were compared using Duncan's multiple range test (P < 0.05). Results: An in vitro method was developed to induce high frequency shoots regeneration from stem, mature leaf and young leaf explants of S. dulcis. Shoot induction on young leaf explants was most successful in MS medium supplemented with combination of two cytokinins (2.32 μM KI and 4.44 μM BAP) 2.85 μM IAA, 10% CM and 1 483.79 μM adenine sulfate. A single young leaf explant was capable of producing 59 shoots after 13 days of culture. Flower was induced in medium supplemented with combination of KI and BAP. Conclusions: Cytokinins are the key factor to induce the direct shoot regeneration and flowering of S. dulcis. © 2011 Asian Pacific Tropical Biomedical Magazine. Source


Tamilselvi N.A.,Tamil Nadu Agricultural University | Jansirani P.,Horticulture College and Research Institute
International Journal of Vegetable Science | Year: 2016

Heterosis breeding can be used to achieve improvement in quantity, quality, and productivity of pumpkin (Cucurbita moschata Duch. ex Poir.). A Line × Tester mating design was used to study standard heterosis for earliness, yield, and yield-related characters in pumpkin during 2009–2010. Thirty-six hybrids, developed by crossing 12 lines with three testers and a commercial check, ‘MPH 1’, were evaluated for earliness, yield and yield related characters and indicated presence of heterotic vigor. The hybrid ‘Kasi Harit’ × ‘Avinashi Local’ had negative relative standard heterosis for the node at which the first female flower appears, sex ratio, fruit number per vine, flesh thickness, and total carotenoid content. Heterosis for days to appearance of the first female flower, days to first harvest, sex ratio, fruit number per vine, flesh thickness, and total carotenoid content was in the desired direction in ‘Vadhalagundu Local’ × ’CO 2’. Estimates of standard heterosis for fruit yield indicated that hybrid ‘Kasi Harit’ × ‘Avinashi Local’ had the highest positive value followed by hybrid ‘Vadhalagundu Local’ × ‘CO 2’. These hybrids had high heterosis for most component traits and can be used for exploitation of heterosis and released as promising hybrids after multilocation testing. © 2016 Taylor & Francis Source


Reddy D.S.,Horticulture College and Research Institute
Indian Journal of Agricultural Sciences | Year: 2015

Studies on the incidence of mango stone weevil, Sternochetus mangiferae (Fabricius) on 18 varieties and 16 hybrids (released and pre-released) were conducted for three years during 2010-2012. Results revealed that all the varieties and hybrids both released and pre-released were susceptible to weevil attack. In varieties high incidence was recorded in Banglora (60.28%), followed by Kesar (48.46%), Manoranjan (42.78%) and Safeda (40.97%). The other commercial varieties, viz. Neelum (37.85%) had higher infestation compared to Baneshan (7.12%). Among all the varieities screened lowest percent infestation was observed in Khader (2.22) and Peterpasand (3.00). Produtur Avakai, Alipasand and Pulihora which were used for pickle purpose also had higher infestation ranging from (30.56-35.71%). In the hybrids Dasheri × Vikarabad shown maximum infestation (73.61%), followed by Padiri × Ambalavi (59.58%). Ratna had lowest infestation of 0.77% compared to Amrapali (43.14%), Mallika (20.56%) and Neeleshan (14.64%). Source


Srinivasa Reddy D.,Horticulture College and Research Institute | Pushpa Latha M.,Horticulture College and Research Institute
Indian Journal of Agricultural Sciences | Year: 2016

Laboratory and field experiments were conducted to test novel acaricide efficacies for the management of twospotted spider mite, Tetranychus urticae (Koch) on betelvine (Piper betle L.). The treatments were abamectin 1.9EC @ 0.3ml, 0.5ml and 0.7ml/l, propargite 57EC @ 2.5 and 3.0ml/l, fenazaquin 10EC @ 1.7ml/l, fenpyroximate 5EC @ 1.25ml/l, spiromesifen 22.9SC @ 0.8ml/l, and compared with conventional compounds, sulphur 80WDG @ 3g/l and dicofol 18.5EC @ 2.5ml/l. In laboratory studies, all the acaricides resulted in 14.47 to 85.53% mortality with highest in abamectin @ 0.7ml/l during I season and lowest in dicofol, whereas in II season lowest per cent mortality of 21.80 was recorded in sulphur and highest mortality of mites (83.40%) was noted in abamectin @ 0.7ml/l at 72h after treatment. The acaricides caused mortality of mites in the range of 16.27 of 90.98% during 10 day observation period in the field studies with highest in abamectin (0.7ml/l) treated plots followed by fenazaquin (59.44% at 10th day) and least mortality was showed by dicofol, i.e. less than 20% in first season but spiromesifen, fenpyroximate and propargite @ 3.0ml/l showed good efficacy, i.e. 51.40%, 46.37% and 40.37% mites mortality, respectively, at 10th day during I season trial. In II season, lower mortality of mites was recorded in dicofol (34.41%-16.99%) and sulphur (38.03%-19.57%) on 1st and 10th day, respectively indicating that these acaricides lost their efficacy over a period of time but abamectin @ 0.7ml/l (90.35-70.39%) and 0.5ml/l (85.65-65.71%) throughout the observation period showed higher efficacy followed by fenazaquin (72.24-56.86%), spiromesifen (69.13-48.60), propargite @ 3ml/l (60.80-39.76%) and fenpyroximate (48.84-28.43%) at 1 and 10th day after spray observations. Abamectin and fenazaquin were superior over other acaricides tested under both conditions followed by spiromesifen, fenpyroximate and propargite. Source

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