Asian Journal of Bio Science

A. Thanga Hemavathy ¹, K. Balaji ²

Affiliations
1 Centre for Plant Molecular Biology, Tamil Nadu Agricultural University, Coimbatore, (T.N.), IN
2 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore (T.N.), IN

Abstract

Mutations were induced in blackgram (Vigna mungo (L.) Hepper) varieties namely ADT 3, ADT 5 and APK 1. Different types of macro mutants and micro mutants were screened in M2 generation. The frequency and the spectrum of the viable mutants were estimated in M₂ generation both in M₁ plant basis and M₂ seedling basis. The highest frequency of viable mutants was recorded in ADT 3. Mutation spectrum was much wider at 60kR and it was narrow at 50kR. The variety ADT 5 had recorded wider spectrum at 60 kR and APK 1 showed higher spectrum at 50kR.

Keywords

Blackgram ADT3, ADT5, APK1.

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K. Balaji ¹, A. Thanga Hemavathy ²

Affiliations
1 Dept. of Entomology, Tamil Nadu Agricultural University, Coimbatore (T.N.), IN
2 Dept. of Entomology, Centre for Plant Molecular Biology & Biotechnology, T.N.A.U., Coimbatore (T.N.), IN

Abstract

The seasonal incidence of coconut eriophyid mite, A. guerreronis was studied during November 2000 to December 2001 in coconut plantations at Kadavasal, Chidambaram, Tamil Nadu. The incidence of mite was found throughout the year. But the peak incidence was observed during dry climate April, May and June and started declining during wet climate July. The correlation between temperature, rainfall and mite population revealed that the population density was positively correlated with temperature and negatively correlated with rainfall. The prediction model has been developed for the given set of parameters.

Keywords

Eriophyid Mite, Seasonal Incidence, Prediction Model.

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A. Thanga Hemavathy ¹, K. Balaji ²

Affiliations
1 Dept. of Entomology, Centre for Plant Molecular Biology & Biotechnology, T.N.A.U., Coimbatore (T.N.), IN
2 Dept. of Entomology, Tamil Nadu Agricultural University, Coimbatore (T.N.), IN

Abstract

The mutagenic effectiveness and efficiency of gamma rays viz., 40, 50, 60, 70 and 80 kR in three varieties of urd bean cultivars namely ADT 3, ADT 5 and APK 1 were studied. The effectiveness of gamma ray shows a consistent relationship of lower doses of gamma ray was found more effective in M₁ plant and M₂ seedling basis. The high effectiveness was recorded in ADT 5 at 40 kR followed by 50 kR in ADT 3 and APK 1 at 50 kR on M₁ plant basis. In M₂ seedling basis the high effectiveness was recorded in ADT 3 at 50 kR followed by ADT 5 at 40 kR and APK 1 at 60 kR. The mutagenic efficiency directly proportional with the increase in the dose among all the varieties studied.

Keywords

Gamma Ray, ADT 3, ADT 5, APK 1, Effectiveness, Efficiency, Blackgram.

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A. Thanga Hemavathy ¹, K. Balaji ²

Affiliations
1 Central Plant Molecular Biology, Tamil Nadu Agricultural University, Coimbatore (T.N.), IN
2 Department of Agricultral Entomology, Tamil Nadu Agricultural University, Coimbatore (T.N.), IN

Abstract

Coconut (Cocos nucifera (Linn.) is a multipurpose crop on commercial importance. Coconut grown in an area of 1.84 million hectares in India with annual production of 125.97 million nuts, Tamil Nadu with an area of 3.24 lakhs hectares holds the third position in the country with an annual production of 3.158 million nuts. Though India is in the fore front in coconut production in the world, the productivity is as low as 40 nuts per palm per year. There is an commence need to identify cultivars and hybrids suitable for manufacturing various industrial products such as coconut oil, desiccated coconut, shell charcoal, coir and coir products etc.

Keywords

Dwarf Types, Inflorescence and Nut Characters.

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