MONOGRAPHIC STUDIES ON Malaxis acuminata D. Don
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Date
2013
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Abstract
ABSTRACT
The present investigation entitled, “Monographic studies on Malaxis acuminata D. Don” was carried out in laboratory and experimental area of the Department of Forest Products, Dr. Y. S. Parmar university of Horticulture and Forestry, Nauni, Solan, (H. P.) during 2011-2013. The result revealed that plants of this species are erect, small with modified stem-composed of rhizome like structure and pseudobulbs. The rhizomes are horn like structure, elongated and tapering while pseudobulbs are more or less globular to conical. The leaves are simple, ovate to lanceolate, petiolated, entire lamina with undulating margin having acute to acuminate tip with a sheathing (attenuate) base and parallel venation. Leaves had 3-7 costae per lamina, however, leaves that developed from pseudobulbs of Shilly germplasm had 3-5 costae only. Leaf constants viz. palisade ratio 0.84±0.03, stomatal index 8.43±0.80, stomata number 70.34±2.28, stomata size 0.036±0.0005mm ×0.03±0.0006mm and anomocytic type stomata have been recorded for the first time in this species. Besides the normal purple flower, some plants from Shilly germplasm were characterized by greenish yellow coloured flowers at full bloom stage with appearance of faint purple spot in the centre of the labellum at senescence stage of flower. Weight of seeds per capsule was 13.17±0.25mg. Malaxis acuminata sprouts in first week of June onwards, flowering commenced second week of June and continued upto second week of July. Fruits start developing during August, ripening during October and thereafter the plants become ready for perennation. Total ash content 4.75±0.01%, acid insoluble ash content 0.40±0.03%, acid soluble ash 4.35±0.04% and sulphated ash value 4.82±0.03% was obtained for rhizomes of Malaxis acuminata. The extractive value was lowest in petroleum ether solvent, followed by methanol and highest in water (19.50%). Propagation studies indicates that plants of Malaxis acuminata can be efficiently raised through rhizomes and pseudobulbs and size of planting material has direct impact on growth and yield of resultant plants. The treatments of rhizomes and pseudobulbs with GA3 (250ppm to 1000ppm) has no positive impact on growth and yield parameters.
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planting, developmental stages, yields, biological development, extraction, wastes, diseases, fruits, biological phenomena, sowing, Malaxis acuminata D. Don,Monographic studies