查看更多>>摘要：Nomenciatural status, morphology and distribution of Nephelaphyllum sikkimensis {Hook, f.) Karthik. is discussed. THE GENUS Nephelaphyllum BI. is represented by 3 species [N. cordifolium (Lindl.) BI., N. nudum Hook. f. and N. sikkimensis (Hook.f.) Karthik.] in India, distributed mostly in Eastern Himalaya and North Eastern India. Of these, N. sikkimensis is the most attractive due to its beautifully coloured leaves. The mottled leaves show close resemblance with the 'jewel Orchid' group and are oftenincluded in this category by horticulturists. Information so far available regarding its occurrence, distribution, nomenciatural status and morphology are either ambiguous or insufficient to understand. The present study based on live collections and herbarium materials is aimed at providing more information on this lesser known species of rare orchids.
查看更多>>摘要：An analysis of compatibility relationships with respect to successful capsule set on hand-pollination under normal field conditions was conducted using 18 monopodial orchid genotypes comprising of monogeneric and bigeneric hybrids. The monogenerics included three members of the genus Arachnis and five members of Vanda and the bigenerics were composed of seven members of Aranda and three Aranthera types. Intercrossing in all the 324 (18x18) possible combinations was done (including selfs) for analyzing the compatibility between genotypes based on post pollination floral changes in successful as well as unsuccessful combinations, stages of capsule development /stages at which pollinated flowers abscised, percentage of capsule set, percentage of capsules with germinating seeds, and percentage of filled seeds over total seeds.Capsules at seed inoculation maturity (80-90% maturity) were successfully harvested from 67 out of the 324 possible combinations. These 67 combinations included 61 crosses and 6 selfs. The pollinated flowers/ immature capsules from the 257 unsuccessful combinations fell off at different stages of development from immediately after pollination to just before capsule harvest depending on the relative intensity of incompatibility expressed.
查看更多>>摘要：Analysis for two isozymes namely esterase and glutamate oxaloacetate transaminase (GOT) was carried out using polyacrylamide gel electrophoresis (PAGE) to identify the ideal tissue (leaf, root, petal, pollen) of orchids, for isozyme analysis. It was observed that petals and leaves follow a similar banding pattern while roots and pollens recorded different pattern in both esterase and GOT isozymes. On the basis of clarity and resolution of bands, the leaf tissue was analysed as the ideal tissue for isozyme analysis.
Mani R ShresthaMukesh K ChettriLokesh R ShakyaDevendra M Bajracharya...
5页
查看更多>>摘要：Shivapuri National Park (Nepal) supports good natural forests in 80% of its 144 km2 area. The forests are dominated by Schima wallichii and Castonopsis indica at lower elevations and by Quercus glauca, Q. semecarpifolia, and Rhododendron arboreum at higher altitudes. The park is rich in orchids. Periodic surveys have revealed the occurrence of 77 species in 34 orchid genera. The habit, distribution range, and population status of different species is presented in this paper. Efforts have also been initiated for their ex situ conservation at Amrit Campus, Kathmandu.
查看更多>>摘要：Extensive field surveys during 1999-2007, reveal the occurrence of 70 species of orchids under 32 genera in Kokrajhar district (Assam). Majority of the species are epiphytic in habit and they are better represented along the peripheral zones of the forest than in their core zones. Dendrobium with 14 species is the largest genus in the district and is followed by Eria with six species; and Acampe, Aerides, Bulbophyllum and Oberonia with 4 species each. Seven genera are represented by two species each,and the remaining 2G genera by a single species each. Chirang Reserve Forest is the richest orchid habitat in the the district; it supports all the presently collected species. Dendrobium aphyllum (Roxb.) C.E.C. Fischer and Papilionanthe teres (Roxb.) Schltr. are identified as the pioneer species in the epiphytic orchid community dynamics, whereas Dendrobium moschatum (Buch-Ham) Sw. and Flickingeria fugax (Reichb.f.) Seidenf. form the dominant climax vegetation in the said community dynamics in the tropical deciduous forests. Cymbidium aloifolium (L.) Sw. is identified as an indicator species for degraded habitat for epiphytic orchids; it exhibits pseudo dominance when natural habitat is completely lost.
查看更多>>摘要：Dendrobium herbaceum Lindl. is reported for the first time in North East India from Mizoram.DURING THE course of our study on the genus Dendrobium Sw. (Orchidaceae) of North East India, we came across a specimen collected by G. K. Deka bearing collection number 41013, dt. 21. 2. 1953 (ASSAM) from Mizoram. After careful examination, it was identified as D. herbaceum Lindl. The species was earlier reported from Andaman and Nicobar Islands, Andhra Pradesh, Bihar, Bombay, Chhattisgarh, Jharkhand, Karnataka, Kerala, Madhya Pradesh, Maharashtra, Mysore, Orissa, Tamil Nadu, and West Bengal (Manilal and Sathish Kumar, 2004; Misra, 2004). Therefore, the present study suggests a new distributional record for the species (Dendrobium herbaceum) from Mizoram in North East India. This paper provides an up-to-date nomenclature, diagnostic description and illustration for easy identification and location of this species elsewhere in the country.
查看更多>>摘要：Floral biology studies were conducted in 15 monopodial orchid genotypes belonging to the genera Aranda, Aranthera, Kagawara, Mokara, Renanthera and Vanda, with good cut flower qualities and popularity in the market. The genotypes showed significant variation for parameters such as flower opening time, anthesis, stigma receptivity period, pollen size, pollen fertility and pollen germination. A clear understanding of these traits under particular experimental locations is inevitable for the successfulconduct of crop improvement programmes in orchids, as some of these traits vary depending on the climatic conditions. The days from flower opening on which these genotypes could be pollinated with maximum success have also been assessed.
查看更多>>摘要：The natural population of Aerides crispa Lindl. in Western Ghats have suffered depletion due to unregulated collection pressures. A recent visit to one of its natural habitats, revealed that the species though represented with a limited population thrives well at Mahabaleswar (Western Ghats, India). This communication, based on critical observations on its floral morphology, attempts to resolve the taxonomic confusion prevalent in the species besides commenting on its relationships.
查看更多>>摘要：The paper reports 16 species of Dendrobium Sw. from the Barak Valley (Assam), and provides information on their distribution range, tree host specificity, flowering period, and biological status in the valley. DENDROBIUM SW., a large group of morphologically diverse and epiphytic orchids known for their beautiful and long-lasting flowers of varied colours, comprises more than 1,000 species distributed in Sri Lanka, India, China/Japan, Malayasia, and Australia and is the second largest genus of the family Orchidaceae. In India, it is represented by 102 species, 20 of which are met in Assam (Barua, 2001). The genus is popular with both the amateur and professional growers having contributed immensely to commercial floriculture. Gogoi (2005) reported 7 floriculturally significant species of the genus from Dibru-Saikhowa National Park and Biosphere Reserve.
查看更多>>摘要：Asymbiotic seed germination of Coelogyne cristata Lindl. was accomplished in agar-gelled MS medium. Complete seedlings were obtained in 8 wks of primary culture. Multiple shoots (9.25 shoots/ plant) were developed from the shoot tip explant obtained from in vitro grown seedlings in MS medium supplemented with BAP (1mgl1) and NAA {0.5 mgl-1)-. Medium supplemented with IBA (1mgl'1) proved optimal for root formation. Thick hairy aerial roots were observed in the media supplemented with IAA (Imgl1).
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