Plants constitute a rich source of bioactive compounds and its acaricidal effect is increasingly been investigated as a potential solution against acaricide resistance. In the present study, the in vitro efficacy of crude ethanolic extract of leaves of Sphaeranthus indicus, its fractions (hexane, chloroform, butanol and water) and subfractions of the active acaricidal fraction were evaluated against Rhipicephalus (Boophilus) annulatus using the adult immersion technique (AIT). The percentage of adult mortality, inhibition of fecundity and hatching rate were assessed. The crude ethanolic extract of leaves of Sphaeranthus indicus revealed hundred per cent adult mortality and inhibition of fecundity at a concentration of 250 mg/mL. Among the four fractions of this extract tested, hexane fraction showed concentration dependent delayed adult tick mortality. At 10 per cent concentration of hexane fraction, 87.41 per cent mortality and 77.78 per cent inhibition of fecundity were observed. Among the 14 subfractions of the active hexane fraction, the subfraction 4 (at 2000 ppm) produced 45.83 per cent mortality and 41.06 per cent inhibition of fecundity. It may be concluded that the hexane fraction of the leaves of ethanolic extract of S. indicus and its subfraction 4 revealed significant acaricidal effects.
Curcuma aeruginosa Roxb., the pink and blue ginger is an underutilized rhizomatous herb used in the Indian as well as Thai and Malaysian systems of traditional medicine.Its antioxidant and nutraceutical properties have also been explored recently. However, no effort has been made to study the genetic variability and genetic control of the agronomic morphometric characters of this species. Hence the present study was carried out to analyse the genetic variability and genetic control of such characters in the species.All the fifteen morphometric characters showed continuous distribution indicating their polygenic control. Among the growth characters, plant height, leaf length, leaf breadth and leaf area showed accumulation of higher number of dominant alleles in their gene pool and number of tillers and number of leaves per tiller showed higher accumulation of recessive factors. Among the yield characters, length of primary fingers and length of secondary fingers showed a balanced distribution of genotypes, number of primary fingers, number of secondary fingers, diameter of primary tillers, length of mother rhizome and yield per plant showed skewness towards the assembly of higher number of recessive factors and diameter of primary fingers and diameter of secondary fingers showed skewness towards the assembly of dominant contributing factors. However, all the characters under study showed comparatively wide distribution of factor combinations, indicating the broad genetic base of the population under study. However, most of the agronomically important characters showed very low frequency of genotypes with higher number of dominant factors indicating the necessity of selecting superior genotypes to develop improved varieties.
Curcuma aeruginosa L., popularly known as Travancore starch plant is an underexploited starchy tuber crop belonging to the family Zingiberaceae. An experiment was designed and carried out presently to evaluate the performance of the crop of Curcuma aeruginosa in relation to the status of the planting materials used. Three types of planting materials such as the mother rhizome, primary fingers and secondary fingers of Curcuma aeruginosa collected from the northern districts of Kerala State of India forms the experimental material. Fifteen growth and yield characters were comparatively studied and among them only three such as the number of leaves per tiller, number of primary fingers and diameter of mother rhizome exhibited statistically significant variations in relation to the status of the planting material. The outcome of the present study indicates the advantage of using mother rhizome, primary fingers and secondary fingers as planting materials so that more number of seed rhizomes can be obtained from a single mother plant.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.