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Ningthoujam Sandhyarani Rajkumar Kishor Gurumayum Jitendra Sharma 《Journal of Crop Science and Biotechnology》2011,14(3):213-217
Acorus calamus is an important medicinal plant which has been used in Indian traditional medicine since time immemorial. Various bioactive
molecules, viz., acorin, α- and β-asarone, asaryldehyde, caryophylene, isoasarone, methylisoeugenol, and safrol have been isolated from this
plant. However, the use of this plant for medicinal purpose has been recently banned due to the high toxic property of β-asarone.
The triploid Acorus calamus is reported to be low in β-asarone content and thus found to be the ideal raw material for medicinal use. The present investigation
represents our finding for successful in vitro clonal propagation of the elite triploid accessions of Acorus calamus for mass propagation. In the dual-phase culture system consisting of agar-solidified Murashige and Skoog medium overlaid
by liquid fraction of the same medium, maximum multiple shoot induction was favored by supplementation of α-naphthaleneacetic
acid (0.5 mg L−1) and 6-benzylaminopurine (2.0 mg L−1). In vitro rooting of the microshoots was maximum in the medium supplemented with indolebutyric acid at 2.0 mg L−1. The well-rooted microshoots could be successfully hardened and transplanted in the field. This result can be reproduced
and is a viable protocol for successful clonal propagation of the seedless triploid Acorus calamus for conservation and sustainable development. 相似文献
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The tobacco caterpillar, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae), is a polyphagous pest defoliating sweet potato, Ipomoea batata (Lam) (Convolvulaceae), throughout Asia. The study of morphometric parameters of S. litura as a result of feeding on three varieties (RNSP1, KIRAN and RNSP3) of host plant revealed that a greater number of egg masses were laid on the KIRAN variety than on the others. I. batata varieties showed statistically significant effects on length, breadth and weight of different larval instars. KIRAN-fed larvae molted to bigger-sized pupae. S. litura larvae reared on KIRAN variety had the highest feeding index as well as growth index. The low concentrations of phenols and carbohydrates coupled with elevated levels of proteins and amino acids were found in KIRAN as compared with RNSP1 and RNSP3. Collectively, the results of this study revealed that KIRAN cultivar was the most suitable food plant for the development of S. litura. Concurrently, it is suggested that this cultivar is therefore least suitable for sweet potato cultivation. 相似文献
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Fiber reinforced polymer composites have played a dominant role for a long time in a variety of applications for their high
specific strength and modulus. The fiber which serves as a reinforcement in reinforced plastics may be synthetic or natural.
To this end, an investigation has been carried out to make use of coir, a natural fiber abundantly available in India. Natural
fibers are not only strong and lightweight but also relatively very cheap. The present work describes the development and
characterization of a new set of natural fiber based polymer composites consisting of coconut coir as reinforcement and epoxy
resin as matrix material. The developed composites are characterized with respect to their mechanical characteristics. Experiments
are carried out to study the effect of fiber length on mechanical behavior of these epoxy based polymer composites. Finally,
the scanning electron microscope (SEM) of fractured surfaces has been done to study their surface morphology. 相似文献
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