Botanica Orientalis: Journal of Plant Science最新文献

{"title":"Weed species composition and growth in wheat field of mountain ecosystem Khokana, Lalitpur, Nepal","authors":"N. Sapkota, BR Dongol, Bhuju","doi":"10.3126/BOTOR.V7I0.4388","DOIUrl":"https://doi.org/10.3126/BOTOR.V7I0.4388","url":null,"abstract":"A study was carried out to determine the composition and predominance of weed species in wheat field in Khokana of Kathmandu valley as a representative sample of mountain ecosystem in Nepal. A total of 44 weed species representing 18 families were recorded. The most abundant species were Chenopodium album , Polygonum plebeium and Spergula arvensis . With the improved temperature after February, the weeds flourished in the late winter which had deterrent effect on the growth of wheat. Weeding practice was not much followed, while the fallowing gave more chances to weed species to germinate and grow. Periodic surveys on weeds help catalogue the existing weeds and extent of harm caused by them. Key-words: Rice-wheat cropping practice; weed ecology; weed management. DOI: 10.3126/botor.v7i0.4388 Botanica Orientalis - Journal of Plant Science (2010) 7: 85-91","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126748314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research Genetic diversity of Ottelia acuminata (Hydrocharitaceae) from the Eastern Himalayas, revealed by ISSR markers","authors":"C. Long, Zhu Jiang, Z. Dao","doi":"10.3126/BOTOR.V7I0.4374","DOIUrl":"https://doi.org/10.3126/BOTOR.V7I0.4374","url":null,"abstract":"Ottelia acuminata (Gagnep.) Dandy (Hydrocharitaceae), an endangered aquatic species, was investigated in the Eastern Himalayas, especially in Yunnan Province of Southwest China. The genetic diversity among seven populations was examined using inter-simple sequence repeat (ISSR) amplification markers. The field survey showed that 43.5% natural populations of O. acuminata have become extinct during the last 30 years. Among 13 remaining wild populations, eight (61.5%) are on the edge of extinction and only five (38.5%) were unaffected. For the study on seven populations based on ten primers, 147 clear and reproducible DNA fragments were generated, of which 144 (97.96%) were polymorphic. Within populations, however, the polymorphic bands (PPB) generated by ISSRs was 53 and occupied 36.05% in population B, and similarly within population J (51 and 34.69%, respectively). The results showed that genetic variation is much higher among populations of O. acuminata than within populations. Analyses of Nei’s gene diversity, genetic distance and Shannon’s index also agreed with these results. The average value of Nei’s gene diversity (h) equaled 0.3710. The coefficient of genetic differentiation (Gst) equaled 0.5487, which means that 54.87% of the total molecular variance existed among populations. Such a high level of divergence present among populations may be caused by the complex topography and separated habitats which effectively restrict gene flow. Moreover, there is a lack of significant association between genetic and geographical distances (r = 0.28889, P > 0.05) in the populations of O. acuminata. Therefore, we proposed an appropriate strategy for conserving the genetic resources of O. acuminata in the Eastern Himalayas; namely, rescuing and conserving the core populations in situ, while selecting and preserving more populations with fewer individuals from each population ex situ. Key-words: Ottelia acuminata , genetic diversity, conservation, Eastern Himalayas, Yunnan Plateau, China DOI: 10.3126/botor.v7i0.4374 Botanica Orientalis – Journal of Plant Science (2010) 7: 56-63","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129963380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phenology of ectomycorrizal fungi in subtropical evergreen Castanopsis forest","authors":"M. Christensen","doi":"10.3126/BOTOR.V6I0.2904","DOIUrl":"https://doi.org/10.3126/BOTOR.V6I0.2904","url":null,"abstract":"The mycota of Himalaya is poorly described and information on the ecology of ecto-mycorrhizal species in the region is very limited. Three years (2004-2006) of intensive studies of the fruitbodies in Schima-Castanopsis forest in Central Nepal have documented a high diversity of ecto-mycorrhizal fungi. Systematic information collected from five forests in the surrounding of Pokhara are analyzed to describe the phenological patterns. The species diversity of fruitbodies is highest just after the first pre-monsoon rainfall in late May to early July and by the late monsoon rain of September and early October. Similar bimodular patterns are described from areas with warm humid climate in Japan. In cold Temperate and Boreal areas in Europe and North America as well as in the mountainous areas of Nepal only one peak of the ecto-mycorrhizal fungi is found. In these areas the temperature seems to be the main agent in determining the time of fructification of the ecto-mycorrhizal fungi. In contrast studies from Subtropical Mediterranean climate in Southern Europe with winter rain found fructification in the cold season, indicating that moisture is more crucial for the fruitbody creation than temperature in subtropical areas. Key-words : Central Nepal; ecto-mycorrhiza; Himalaya; Schima-Castanopsis forest. DOI: 10.3126/botor.v6i0.2904 Botanica Orientalis - Journal of Plant Science (2009) 6: 8-11","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123416621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Medicinal plants in Rasuwa district, central Nepal: trade and livelihood","authors":"Kamal Humagain, K. Shrestha","doi":"10.3126/BOTOR.V6I0.2909","DOIUrl":"https://doi.org/10.3126/BOTOR.V6I0.2909","url":null,"abstract":"The present paper deals with the study conducted during 2006-2008 to assess trade pattern of important medicinal plants in Chilime Village Development Committee (VDC) of Rasuwa district, Nepal. Chilime VDC is one of the important trade centres of medicinal plants in the district. We documented 60 species of important medicinal plants, including 26 species involved in trade. Among them, 12 most potentially traded species, which have been given high priority by the collectors and traders, were selected for the study of their market potential and their contribution to the local livelihood. About 40% of the households of Chilime VDC were found to be involved in the collection and trade of medicinal plants. Most of the collection (90%) was for trade, which has supported up to 40% of family income contributing average household net profit of NRs 9,000 per year. The local traders were also making a good profit from medicinal plants with annual net contribution of about NRs 0.25 million per trader. But only 50% of actual traded quantity was registered at DFO resulting low revenue collection (only 43% of the expected). This shows that illegal trade is a common practice in the area by which the local traders increase their profit because they do not have to pay revenue. Thus strong mechanisms should be developed to stop illegal trade of medicinal plants and to promote revenue generation. Key-words : Langtang National Park; NTFPs; revenue; Tamang; trade channel. DOI: 10.3126/botor.v6i0.2909 Botanica Orientalis - Journal of Plant Science (2009) 6: 39-46","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122315092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In vitro study of Tinospora cordifolia (Willd.) Miers (Menispermaceae)","authors":"Aditi Singh, Saroj Kumar Sah, Aunji Pradhan, Sabari Rajbahak, N. Maharajan","doi":"10.3126/BOTOR.V6I0.2918","DOIUrl":"https://doi.org/10.3126/BOTOR.V6I0.2918","url":null,"abstract":"In vitro study was carried out in an important medicinal plant Tinospora cordifolia (Willd.) Miers belonging to the family: Menispermaceae. Vegetative parts such as stem, leaf and nodal explants were excised from an elite in vivo grown mature plant and thereafter cultured on Murashige-Skoog (MS) medium supplemented with different hormonal concentrations for callus induction and organogenesis. Callus formation occurred from nodal segments, leaf and inter-node explants when planted on different combinations of hormones. Tinospora cordifolia showed response for in vitro shoot growth from the nodal segment. The best shoot growth was observed on MS medium supplemented with kinetin (1.5 mg/l). Similarly, the best result for root induction was obtained on MS medium supplemented with 6-benzylaminopurine (1.0 mg/l) and naphthaleneacetic acid (2.5 mg/l). Key-words : callus induction; explants; medicinal plant; MS medium; tissue culture. DOI: 10.3126/botor.v6i0.2918 Botanica Orientalis - Journal of Plant Science (2009) 6: 103-105","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114683478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Liverworts and hornworts of Nepal: a synopsis","authors":"N. Pradhan, S. D. Joshi","doi":"10.3126/BOTOR.V6I0.2913","DOIUrl":"https://doi.org/10.3126/BOTOR.V6I0.2913","url":null,"abstract":"This work presents documentation of liverworts and hornworts of Nepal based on field research and compilation of the previous works done in different geographical regions of the country. Altogether, 43 families under 6 orders of the class Hepaticae and 1 family and 1 order of the class Anthocerotae reported in Nepal have been enumerated in this paper. An overall list of 107 genera and 428 species of Hepaticae, and 4 genera and 11 species of Anthocerotae are presented. Key-words : Anthocerotae; bryologists; Hepaticae. DOI: 10.3126/botor.v6i0.2913 Botanica Orientalis - Journal of Plant Science (2009) 6: 69-75","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115209842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parthenium hysterophorus L., a noxious invasive weed","authors":"Vivek Ranjan Paudel","doi":"10.3126/BOTOR.V6I0.2915","DOIUrl":"https://doi.org/10.3126/BOTOR.V6I0.2915","url":null,"abstract":"Parthenium hysterophorus L., a member of the family Asteraceae and native to subtropics of North and South America, is an invasive plant species that colonizes disturbed areas, cultivated lands, roadside vegetation, and human settlement areas. The weed has prolific seed producing ability and fast spreading in nature. The plant is rapidly infesting into tropical and subtropical regions of the world. Its occurrence in Kathmandu valley was reported first time in 1986. The seeds are highly viable and adaptive and can travel long distance with the help of its wing like structures at the base. They can anchor on rough surfaces with the help of feathered claws like structures. The weed is being very problematic because of its aggressiveness, allelopathic impacts, and health hazard risks for human and livestock. The weed posses different allelochemicals, specially sesquiterpenes and phenolics, parthenin being the chief one. The weed adversely affects crop plants and sensitive grass species. Besides it causes hay fever, dermatitis, skin infections, bronchitis and several other health impacts. The control of the weed is a challenging task; however, different herbicides and some biological agents have been reported for its management. Key words : allelochemicals; allelopathy; health hazard; Nepal; parthenin; sesquiterpene. DOI: 10.3126/botor.v6i0.2915 Botanica Orientalis - Journal of Plant Science (2009) 6: 85-92","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"219 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122705123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GIS/Remote sensing techniques for resource management and biodiversity protection in mountainous regions","authors":"J. All","doi":"10.3126/BOTOR.V6I0.2916","DOIUrl":"https://doi.org/10.3126/BOTOR.V6I0.2916","url":null,"abstract":"Biodiversity protection in mountainous regions requires effective fact-driven resource management techniques. Geoinformatic tools including GIS and remote sensing can be integrated to provide regional-scale data products across time for use in strategic and management level policymaking. Several principles are discussed to ensure that geoinformatics data and analysis can effectively contribute to resource management by clarifying issues and minimizing misinterpretation. A case study in the Chilean Andes elucidates these principles. Biological impacts of recent climate changes have not been equal across different ecosystems and stable forest ecosystems provide the best response to climate change. Geoinformatics is used to differentiate functional ecological groups and evaluate long-term resilience to climate change. Key-words : Chilean Andes; climate change; mountain ecosystems; geoinformatics; vegetation. DOI: 10.3126/botor.v6i0.2916 Botanica Orientalis - Journal of Plant Science (2009) 6: 93-99","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129711115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In vitro seed germination in Cymbidium elegans Lindl. and Dendrobium densiflorum Lindl. ex Wall. (Orchidaceae)","authors":"Shreeti Pradha, B. Pant","doi":"10.3126/BOTOR.V6I0.2917","DOIUrl":"https://doi.org/10.3126/BOTOR.V6I0.2917","url":null,"abstract":"A comparative study of in vitro seed germination of two endangered orchid species, viz . Cymbidium elegans Lindl. and Dendrobium densiflorum Lindl. ex Wall., was carried out on Murashige and Skoog's (MS) medium, supplemented with different concentrations and combination of 6-benzylaminopurine (BAP) and a-Naphthalene acetic acid (NAA). The hormone-free MS medium and MS medium supplemented with various growth hormones were found effective for in vitro seed germination of both species. However, the seeds of these two species showed variation in their germination behavior. Hormone-free MS basal medium was found most effective for seed germination of D. densiflorum ; whereas, basal medium supplemented with BAP (1mg/l) was effective for C. elegans . The seeds of D. densiflorum showed quick response in earlier germination, protocorm formation and further development into seedlings in comparison to C. elegans. In C. elegans , germination of immature seeds started after nine weeks of inoculation; whereas in D. densiflorum, the initiation of germination started after five weeks of culture. The variations in seed germination, protocorm formation and seedling differentiation in the two orchid species might be due to the differences in their genetic constitution and the presence of different endogenous growth stimulating substances present in their seeds. The present study has provided useful information for in vitro clonal mass multiplication of these commercially important orchid species. Key-words : growth hormone; in vitro study; orchid. DOI: 10.3126/botor.v6i0.2917 Botanica Orientalis - Journal of Plant Science (2009) 6: 100-102","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127570625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Taxonomy of the genus Commelina Plum. ex L. (Commelinaceae) in Nepal","authors":"J. P. Gajurel, K. Shrestha","doi":"10.3126/BOTOR.V6I0.2907","DOIUrl":"https://doi.org/10.3126/BOTOR.V6I0.2907","url":null,"abstract":"About 170 species of Commelina are known from tropical and subtropical regions of the world. Nepal contributes 6 species of Commelina to the world flora. In the present work, taxonomy of all the six species of Commelina reported from Nepal ( C. benghalensis, C. caroliniana, C. diffusa, C. maculata, C. paludosa and C. suffruticosa ) was studied. Voucher specimens were collected from Central and Eastern Nepal, covering 14 districts. Morphological characters were studied from these collections. Palynological and anatomical characters were also used to see if they are taxonomically important to delimit the taxa within Commelina . Morphological characters seemed promising to delimit the taxa within Commelina . The key identifying characters at species level are modification in root, form of spathe, structure of leaves and seeds, shape of stomata and pollen. Palynological and anatomical characters were also useful, to some extent, in separating some species, but were not significant as compared to morphological data. Some specimens, close to C. benghalensis and C. caroliniana , showed very different characters. Thus further study is needed to confirm their taxonomic status. Key-words : anatomy; flora; morphological characters; palynology; voucher specimens. DOI: 10.3126/botor.v6i0.2907 Botanica Orientalis - Journal of Plant Science (2009) 6: 25-31","PeriodicalId":252680,"journal":{"name":"Botanica Orientalis: Journal of Plant Science","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125625914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}