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Effect of mutagens on quantitative characters in M2 and M3 generation of sesame (Sesamum indicum L.)

100%

Ravichandran V., Jayakumar S.

International Letters of Natural Sciences

2015

tom 42

The mutagenic effects of different dose/concentrations of gamma rays (30, 40 and 50 KR) and ethyl methane sulphonate (1.0, 1.5 and 2.0 mM) on sesame (Sesamum indicum L.) varieties VRI-1 were investigated. The characters studied include; days to first flower, plant height, number of branches per plant, number of capsule per plant, number of seeds per capsule and seed yield per plant in M2 and M3 generations. Both negative and positive shifts in mean values were recorded as a result of the physical and chemical treatments. The results indicate the possibilities of evolving higher yield variants through proper selection. Thus, economic traits like number of capsule per plant, number of seeds per capsule and hundred seed weight in M3 generation offer scope for selection and improvement.

Study on web-site attributes and predatory efficiency of Dark Tetragnathid Spider in Point Calimere Wildlife and Bird Sanctuary

61%

Jayakumar S., Paramanandham J., Duraimurugan V., Sankari A., Ramya A., Sathiskumar S., Durga A.

International Letters of Natural Sciences

2017

tom 62

Spiders represent one of the most abundant components of the predatory arthropods in terrestrial ecosystem. Their effectiveness at restricting pest populations, both alone and as part of natural enemy complex has well demonstrated in many countries. The web, web-site attributes and predatory efficiency of Dark Tetragnathid Spider Tetragnatha mandibulata were assessed in Point Calimere Wildlife and Bird Sanctuary between August 2015 and March 2016. In the present study, the spiders used limited number of plants species. The relationship between web architecture and web-site attributes was estimated using Pearson’s correlation. Number of spiders recorded in the web showed the positive correlation with web horizontal and vertical length of the capture areas (p<0.05). Similarly, the web circumference showed the positive interaction with plant height and canopy width (p<0.05), which clearly indicated the importance of vegetations across the webs of Dark Tetragnathid Spider. Further, the microhabitat selection and utilization could also be impacted by non-trophic factors like structural features of plants that provide architectural supports to spiders. A total of 4620 insect pests comprising seven orders were entangled by the webs of dark tetragnathid spiders. Number of spiders in the web were positively correlated with number of insect pests (p<0.05), which clearly explained that the Dark Tetragnathid spiders restricting pest populations and therefore they are considered as useful organism in biological control.

Ograniczanie wyników

2 International Letters of Natural Sciences

2 Jayakumar S.

1 Duraimurugan V.

1 Durga A.

1 Paramanandham J.

1 Ramya A.

1 Ravichandran V.

1 Sankari A.

1 Sathiskumar S.

1 2017

1 2015

Wyniki wyszukiwania

Effect of mutagens on quantitative characters in M2 and M3 generation of sesame (Sesamum indicum L.)

Study on web-site attributes and predatory efficiency of Dark Tetragnathid Spider in Point Calimere Wildlife and Bird Sanctuary