Lobsang Wangchu - Academia.edu (original) (raw)

Papers by Lobsang Wangchu

… and therapeutic values …, 2008

The tamarind is an economically important medicinal tree, found in many countries of Asia, Africa... more The tamarind is an economically important medicinal tree, found in many countries of Asia, Africa and South America. It is ideal for drier-arid regions, especially in areas prone to prolonged drought. Tamarind fruits were well known in Europe for their medicinal properties, having ...

Sustainability, Apr 18, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

315-321Tamarind a native plant of tropical Africa is best known for its fruits, which contain abo... more 315-321Tamarind a native plant of tropical Africa is best known for its fruits, which contain about 30 per cent, sticky, edible pulp. The acidic pulp is a common ingredient in culinary preparations such as curries, chutneys, sauces, ice cream and sherbet in countries where the tree grows naturally.Green tamarind is pickled in brine. In Asia sweetmeats or the sugared tamarind made by rolling the semi-dried pulp and seed in crystal sugar are very popular products of tamarind fruit. Tamarind fruit is full of acidity which combines well with sugar, chilli and other flavours, hence its pulp is used to prepare a variety of traditional refreshing and highly energetic drinks. Tamarind seed kernel powder (TKP) is a major industrial product, which is used in the sizing of textile, paper and jute. The seed and its extracts can be used in the food processing industry, as an adhesive in the plywood industry and in the tanning industry due to the high tannin content in the seed testa. Some proces...

Tamarind a native plant of tropical Africa is best known for its fruits, which contain about 30 p... more Tamarind a native plant of tropical Africa is best known for its fruits, which contain about 30 per cent, sticky, edible pulp. The acidic pulp is a common ingredient in culinary preparations such as curries, chutneys, sauces, ice cream and sherbet in countries where the tree grows naturally. Green tamarind is pickled in brine. In Asia sweetmeats or the sugared tamarind made by rolling the semi-dried pulp and seed in crystal sugar are very popular products of tamarind fruit. Tamarind fruit is full of acidity which combines well with sugar, chilli and other flavours, hence its pulp is used to prepare a variety of traditional refreshing and highly energetic drinks. Tamarind seed kernel powder (TKP) is a major industrial product, which is used in the sizing of textile, paper and jute. The seed and its extracts can be used in the food processing industry, as an adhesive in the plywood industry and in the tanning industry due to the high tannin content in the seed testa. Some processed pr...

International Research Journal of Pure and Applied Chemistry

The present study was carried out with the aim to screen out the nutritional characteristics of t... more The present study was carried out with the aim to screen out the nutritional characteristics of three underutilized fruit species of the genus Spondias which are seen grown wild in the forest of the north-eastern region of India, as the detail information on nutrient composition of these fruit species is scarce and people are unaware of the nutritional factor though inadvertently consuming a good amount of nutrients from these fruits. The present nutritional assessment revealed that the fruit of Spondias pinnata was found to possess highest TSS content (15.27 °Brix) however it was observed to exhibit higher acidity (4.59%) as well. The minimum titratable acidity was found in Spondias axillaris (2.45%). Spondias pinnata exhibited the highest ascorbic acid content (74.16 mg/100 g) followed by Spondias axillaris (61.60 mg/100 g) while the lowest (31.55 mg/100 g) was found in Spondias cytherea. Further, from the experiment, it was found that Spondias pinnata having the highest ascorbic ...

The effects of aluminium toxicity on two citrus species-Rough lemon (Citrus jambhiri) and Samphol... more The effects of aluminium toxicity on two citrus species-Rough lemon (Citrus jambhiri) and Samphola, a wild species, were evaluated in a sand culture experiment for 20 days. One month old seedlings were subjected to 3 concentrations of AlCl3.6H2O viz., 600 µM, 1200 µM and 1800 µM with untreated pots monitored as control. After 20 days of exposure, aluminium induced toxicity decreased shoot and root length, dry weight, relative water content, chlorophylls and total soluble protein of both citrus species. However, alterations in these parameters were more distinct in higher Al doses wherein Rough lemon exhibited greater decline than compared to Samphola. The peroxidation of lipids, however, significantly elevated in both citrus species with Rough lemon exhibiting higher levels of lipid peroxidation than Samphola. Therefore, with respect to these parameters, our results show that Samphola is comparatively more tolerant to aluminium toxicity than Rough lemon.

Indian Journal Of Entomology, 2021

For the first time, stem borer Aristobia reticulator (Voet) has been recorded on Indian gooseberr... more For the first time, stem borer Aristobia reticulator (Voet) has been recorded on Indian gooseberry or aonla Emblica officinalis Gaertn., from the northeastern region of India. Roving and fixed plot surveys were conducted to assess its incidence in plantations, where 58.9% damage was observed. Most of the trees were infested by >2 larvae/ tree. It was also observed that older trees are more prone as female prefers these bigger and previously injured trees for oviposition. Larva progressively move downwards while feeding and travels 142.6-178.7 cm inside the tunnels. The larval tunnels were short in young plantations and longer in aonla compared to litchi. The body measurements of all stages on A. reticulator were shorter on aonla compared with litchi. Beetles preferred to lay eggs on litchi, followed by aonla, whereas guava was the least preferred host for oviposition.

Bangladesh Journal of Botany, 2019

Twenty eight diverse landraces collected from various parts of North Eastern Region of India alon... more Twenty eight diverse landraces collected from various parts of North Eastern Region of India along with two checks were evaluated to study the diversity pattern among the genotypes on 17 morphological traits. High magnitude of genotypic coefficients of variation (GCV) and heritability coupled with high genetic gain were observed for average fruit weight, fruit yield per plant, number of fruits per plant, fruit length, number of branches per plant, number of seeds per fruit and 100 seed weight. However, these parameters were moderate for early fruit harvest and total soluble solids (TSS). Thirty genotypes were grouped into 6 clusters which showed intercluster D2 values ranging between 115.81 and 670.08. Grouping of genotypes of same location in different clusters indicated that the geographical diversity may not necessarily be related to genetic diversity. The cumulative contribution (82.28%) of fruit weight, 100-seed weight, number of branches per plant and fruit yield per plant to ...

The Coleopterists Bulletin, 2017

Aristobia reticulator (Voet) is reported for the first time in India as a stem borer of litchi tr... more Aristobia reticulator (Voet) is reported for the first time in India as a stem borer of litchi trees, Litchi chinensis Sonn. (Sapindaceae) in the State of Arunachal Pradesh. Beetles were observed feeding on bark, thereby girdling stems, branches, and soft twigs, while larvae tunneled inside the stem. Of 382 trees examined in the survey, 88.5% were damaged by this pest. The grubs caused maximum damage in saplings and branches. The beetles emerged during June-August from stems by making an exit hole, and thereafter they fed on the bark of tender branches. After pre-mating and pre-oviposition periods of 4.8 and 7.5 days, respectively, females cut a slit into the bark and laid eggs under it. Incubation period ranged from 15 to 26 days. Newly hatched larvae first started feeding subcortically and then entered the sapwood. Larvae continued to move down the branches, feeding and ejecting frass from their tunnels. The mature larva formed a pupal cell under the bark. The mean larval and pupal periods ranged 260-288 (mean = 274.5) and 32-42 (mean = 38.4) days, respectively. Beetles emerged from the pupal cell by cutting a circular exit hole. Adult males survived longer than females. Females laid 16-43 eggs during an oviposition period of 25-42 days. The beetle has a life cycle of approximately one year. In host preference studies, A. reticulator laid eggs on litchi and guava only, although beetles were also found to feed on the bark of Cajanus cajan (L.) Huth (Fabaceae), but larval development was not observed.

II International Symposium on Pomegranate and Minor - including Mediterranean - Fruits: ISPMMF2009, 2011

Using polyacrylamide gel electrophoresis, peroxidase and esterase isozymes were investigated from... more Using polyacrylamide gel electrophoresis, peroxidase and esterase isozymes were investigated from leaf tissue samples of 44 selected (superior) jackfruit genotypes. These selected genotypes were collected following jackfruit descriptor 2000, after surveying 1500 trees in the districts of Nadia, 24 Parganas (N) and Coochbehar in West Bengal. The selected genotypes were analyzed for isozyme variation for peroxidase and esterase. Polymorphism was observed in both the enzyme systems studied, where several bands were found showing similarities and dissimilarities among the selected types. In the peroxidase assay, 7 loci were identified among the 44 genotypes. The relative mobility (R m) values of the loci ranged between 0.29 and 0.50. Whereas in the esterase assay, 6 loci were identified and the relative mobility (R m) values of the loci ranged between 0.22 and 0.65. Moreover, it was observed that genotypes collected from nearby locations did not show similar banding patterns, indicating that forces other than geographical origin, such as exchange of genetic stocks, genetic drift, spontaneous variation, natural and artificial selection, cross pollination and seedling origin of the plant are responsible for the genetic diversity. MATERIAL AND METHODS The present investigation was carried out on 15-or above year-old trees of different jackfruit genotypes. The selected superior genotypes were collected from three districts of West Bengal viz., Nadia, 24 Parganas (N) and Coochbehar. Vegetatively propagated selected genotypes were maintained at the Horticultural Research Station, Mondouri and biochemical analyses were carried out at the laboratory located at the Agricultural Research Complex Building, Kalyani.

International Journal of Current Microbiology and Applied Sciences, 2021

International Journal of Chemical Studies, 2020

Salinity is a commonly occurring abiotic stress and poses as a major impediment in citrus product... more Salinity is a commonly occurring abiotic stress and poses as a major impediment in citrus production as the crop has less tolerance ability to this stress. It causes severe osmotic stress restraining overall performance of the plant. One month old seedlings of Rangpur lime, Rough lemon and Indian wild orange were established in sand media and later exposed to stress for 48 hrs in a low cost polyhouse. The different levels of sodium chloride (0 mM, 75 mM and 100 mM) was used for simulating salt stress. The morpho-physiological parameters viz., shoot and root length, fresh and dry weight of shoot and root and Relative water content (RWC) were reduced on exposing to stress with severity being in 100 mM NaCl. On comparing citrus species, Rangpur lime performed better at both stress levels than Rough lemon and Indian wild orange exhibiting its tolerance towards salinity.

Current Journal of Applied Science and Technology, 2019

The present investigations were carried out on forty genotypes of jackfruit (Artocarpus heterophy... more The present investigations were carried out on forty genotypes of jackfruit (Artocarpus heterophyllus Lam.) to determine the extent of variability present in the material and association among different traits. The genotypes were collected from six north-eastern states of India viz. Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram and Tripura during the two years 2016 and 2017. Selection and identification of superior genotypes were done following IPGRI jackfruit descriptor. The experiment was laid using randomized block design with three replications during the year 2016 and 2017 under Department of Fruit Science, College of Horticulture and Forestry, Central Agricultural University, Pasighat, East Siang, Arunachal Pradesh. The phenotypic coefficients of variability and genotypic coefficients of variability were recorded highest values for weight of fresh flake without seed (52.69% & 50.52%, respectively), stalk length (51.09% & 49.06%, respectively) and fruit weight (48.11% &...

Crop research, 2015

The experiment on forced flowering of pineapple (Ananas comosus cv. Kew) in response to cold stre... more The experiment on forced flowering of pineapple (Ananas comosus cv. Kew) in response to cold stress, ethephon, calcium carbide and activated charcoal was carried out at Fruit Research Farm, Department of Fruit Science, College of Horticulture & Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh in the year 2013–14. The experiment was laid out in completely randomized block design with eight treatments and three replications. The treatments were: T1–Control, T2–Iced cold water, T3–NAA @ 0.002%, T4–1% CaC2, T5–1% CaC2+0.5% Activated charcoal, T6–0.025% Ethephon+0.04% CaC2+2% urea, T7–0.24% Ethephon+2% urea and T8–4% CaC2. Here, T7 (0.24% ethephon+2% urea) showed highest flowering percentage of 93.66 followed by T6 (0.025% Ethephon+0.04% calcium carbide+2% urea) with 91.33. Treatment T1 (Control) showed lowest flowering percentage of 24.66.

Journal of Pharmacognosy and Phytochemistry, 2021

To know the effect of zinc and boron on crop growth a field experiment was conducted at vegetable... more To know the effect of zinc and boron on crop growth a field experiment was conducted at vegetable research farm, College of Horticulture and Forestry, Pasighat during the rainy season of the year 2019. Two micronutrients (Zinc and Boron) in the form of zinc sulphate and borax were taken in different concentrations (0.5, 1.0 and 1.5%) and applied at 30 and 60 DAS respectively. The results indicated that among different treatments the highest plant height (141.18 cm) at final harvest, Number of nodes per plant (16.26), Inter-nodal length (8.78 cm) and Number of branches per plant (1.93) were recorded the highest with the treatment receiving Borax-1.0% (T5). The least days taken to first flowering (52.77) and fifty per cent flowering (60.13) were also recorded with the same treatment (Borax-1.0%). All the other parameters found significantly lowest under control treatment (T0).

Molecular Breeding, 2015

Genetic mapping in ornamental plant species has lagged behind crop plants from other sectors of a... more Genetic mapping in ornamental plant species has lagged behind crop plants from other sectors of agriculture. Here, we describe the generation of a genetic linkage map for the important herbaceous ornamental crop petunia and the identification of QTL for several key crop timing and quality traits, including plant development rate, days to flower and flower number. An F 2 population derived from a cross between the progenitor species of cultivated petunia, P. integrifolia 9 P. axillaris, exhibited transgressive segregation for a broad panel of crop timing and quality traits. A genetic linkage map comprised of 75 simple sequence repeat and six cleaved amplified polymorphic sequence markers spanning 359.1 cM across seven linkage groups was developed and utilized to identify 24 QTL for ten crop timing and quality traits. These included QTL explaining 26.3, 25.9, 26.2 and 43 % of the observed phenotypic variation for flower length, branch number, internode length and the number of flower buds on the primary shoot, respectively. These data provide a foundation for understanding the genetic control of critical traits and identify molecular markers with potential utility to facilitate gene discovery in petunia.

Genetic Resources and Crop Evolution, 2020

Garcinia , an evergreen polygamous tree and shrub distributed in tropical Asia, Africa and Polyne... more Garcinia , an evergreen polygamous tree and shrub distributed in tropical Asia, Africa and Polynesia belong to the family Clusiaceae. This genus consists of several species which are widely used as a source of edible fruits, timber, resin, and other natural products, and are also utilized in the treatment of various ailments in Indian ayurveda. About 35 species are found in India, many of which are endemic and economically important with immense medicinal properties, and are a rich source of bioactive molecules including xanthones, flavonoids, benzophenones, lactones and phenolic acids. Species of Garcinia grow extensively in semi wild state, in the Western Ghats covering Maharashtra, Goa, coastal areas of Karnataka, Kerala, Nilgiri Hills, the evergreen forests of North East Hill region, West Bengal, Andaman Islands, Orissa, and Bihar among others. Garcinia is the source for a natural diet ingredient Hydroxy Citric Acid (HCA) which is an anti-obesity compound. Most of the species also possess antibacterial, antifungal, anti-ulcerogenic, cardioprotective, anticancer, chemopreventive, free radical scavenging, and antioxidant properties. However, lack of consciousness and awareness coupled with habitat destruction led to the genetic erosion of this forest resource, and many species are threatened which need to be conserved and further studied for its nutrient and phyto-pharmacological properties. This paper reviews the nutritional value, the phytochemical compounds, traditional uses and validated pharmacological properties of different Garcinia species.

Frontiers in Nutrition

This study brings out the critical role of lesser-known local plant species in the food, nutritio... more This study brings out the critical role of lesser-known local plant species in the food, nutrition and livelihood security of Adi community in Arunachal Pradesh, India. Considering women as a major custodian in knowledge and practices on foods, a total of 90 Adi women and 60 key knowledgeable community members (thus a total of 150 participants) were selected from East Siang and Upper Siang districts of Arunachal Pradesh. Data were collected using combination of methods including recipe contest, focus group discussion, personal interviews and laboratory analyses. The results indicated that Adi women were able to identify 39 bioculturally important species from a range of locally available plant species. Used alone or with other foods, these plants remain central to the Adi people's cultural identity and livelihood security. In addition to improving food and nutritional security, these species accessed from different land use systems, are also sold on the local markets to generate...