Field experiments were conducted to screen the mungbean genotypes based on root characters and root penetration ability. Observations on root and shoot characters viz., root length, shoot length, number of roots, root diameter, fresh weight of root, fresh weight of shoot, dry weight of root, dry weight of shoot, root volume, growth and yield parameters viz., plant height, number of branches, number of pods per plant, number of seeds per pod, 100 seed weight, seed yield per plant were recorded. Based on the root characters, the genotypes HUM 1, VMGG 67, VMGG 82, VMGG 83 and VMGG 90 were found to be promising. They also performed well in the field experiments. These genotypes were crossed with high yielding varieties like VBN 1, VBN 2, VBN 3 and KM 2 to get F 1. Among the 20 crosses obtained, three crosses VMGG-83/VBN 2, VMGG-90/VBN 3 and VMGG-83/VBN 1 were found to perform well in F 2 and they will be forwarded to next generation.
Submergence tolerance is an important character to be considered when flash flood damages rice. Tolerant genotypes can withstand submergence for 1-2 weeks based on their tolerance level. Hence with a view to study the effect of submergence on germination and seedling attributes, eight cultivated varieties were subjected to submergence tolerance at five levels of flooding viz., 1 cm, 2 cm, 3 cm, 4 cm and 5 cm flooding levels. CR 1009 sub 1, a submergence tolerant variety was used as check. With increase in submergence levels, greater reduction was observed for all the parameters. Survival % and seedling length were found to be decreased under flooded conditions, but to a much lower extent in the tolerant genotype. Flooding decreased shoot, root and total dry matter production in all the varieties with more reduction in higher flooding (5 cm) rather than lower flooding (1cm) levels.
Mosquitocidal activities of Lavandula angustifolia (L. angustifolia) different concentration of essential oil (EO) and its major phytocompounds (MPCs) tested against three important human vector mosquitoes (HVMs). The quantitative analyses of EO phyto-chemical compositions (PCCs) were analyzed by using Gas Chromatography-Mass Spectrometry (GC-MS). The HVMswere exposed to various concentrations of EO and its MPCs tested under laboratory condition by using standard protocols. Vector mortalities were subjected to log-probit analysis. Chemical compositions (CCs) of 47 compounds were identified and the MPCs of EO were Terpinen (38.0339%) followed by Linalool (34.4992%), Caryophyllene (6.1480%), Octanone (2.3906%) and Camphene (2.0989%). The maximum larval mortality was found in Linalool against the larvae of Aedes aegypti (Ae. aegypti) followed by Anopheles stephensi (An. stephensi) and Culexquinquefasciatus (Cx. quinquefasciatus) with the LC 50 values were 36.26, 36.81 and 37.49 ppm respectively. Ovicidal activity of the Linalool found most effective than other compounds. These results are clearly suggests that EO and its MPCs have the potential to be used as an ideal ecofriendly approach, traditional method for control of HVMs and this is the first report on the mosquitocidal activities of L. angustifolia EO of MPCs.
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