Multivariate Analysis of Genetic Divergence among Castor (Ricinus communis L.) Inbreds Using Mahalanobis D² Statistic | Chapter 9 | Agricultural Sciences: Techniques and Innovations Vol. 4

 

Castor (Ricinus communis L.) is an oilseed crop that offers a wide range of industrial applications. Assessing genetic variation is crucial for identifying genetically distinct individuals and plays a vital role in plant breeding programs for developing improved cultivars adapted to varying environmental conditions. The aim of this study is to evaluate the genetic diversity among different inbred lines of castor. The investigation was carried out during kharif, 2024, at the Agricultural Research Station, Ananthapuramu, Andhra Pradesh, India. Using the Mahalanobis D2 Statistics, 40 castor inbred lines were examined to determine the extent of genetic diversity for 12 traits. According to Tocher's technique, the total genetic resource set was divided into six unique, non-overlapping clusters, indicating the presence of an ample amount of genetic diversity. Cluster I was the largest one, comprising 32 genotypes, followed by cluster II with three genotypes, and cluster V with two genotypes. Whereas clusters III, IV, and VI were monotypic, indicating a high degree of heterogeneity among the lines. Clusters   IV and VI had the greatest inter-cluster distance between them, showing that these genetic resources could be used in inter-varietal hybridisation. The trait with the highest contribution to overall divergence was effective primary spike length followed by number of capsules per primary spike, total seed yield, final plant stand, and 100 seed weight, demonstrating the potential of the material for further improvement through those traits.

 

 

Author(s) Details

I. K. CHANDANA
Department of Genetics and Plant Breeding, S.V. Agricultural College, Tirupati-517 502, A.P, India.

 

A.V.S DURGA PRASAD
Department of Genetics and Plant Breeding, SMGR Agricultural College, Udayagiri-524 226, A.P, India.

 

M. REDDI SEKHAR
Department of Genetics and Plant Breeding, SMGR Agricultural College, Udayagiri-524 226, A.P, India.

 

Please see the book here :- https://doi.org/10.9734/bpi/asti/v4/6300

Efficacy of Castor Oil as a Biopesticide for Treatment of Leucinodes orbitalis Guenee L., a Pest of Eggplant (Solanum melongena) | Chapter 9 | Research Advances and Challenges in Agricultural Sciences Vol. 5

Leucinodes orbonalis Guenee L. is a pest of eggplant. It is currently managed using synthetic chemical s. However, certain plants with insecticidal properties can be used to control Leucinodes orbonalis in eggplant. To study the efficacy of the castor oil solution on Leucinodes orbonalis, a trial was carried out at the ISAV in Faranah from 08/05 to 20/08/2023.Castor oil was extracted using a press machine with a yield of 0.41 l/kg. It was carried out at the station and in the laboratory. The experimental set-up used was a complete randomised block design with four replicates and five treatments. The treatments were D0 = 0 l/ha (control); D1 = 2.5 l/ha; D2 = 5 l/ha and D3 = 7.5 l/ha. The parameters monitored were: incidence of attack, number of plants leafed out and productivity. The survival of Leucinodes orbonalis larva after treatment was also estimated in vitro. The results showed that the incidence of attack after treatment was 68% for the control. However, this incidence was 10, 4 and 2% for doses D1, D2 and D3 respectively. With regard to the number of leafless plants, the rates were 68% for the control, 33% for D1, 17% for D2 and 8% for D3. Productivity was: 3.00 t/ha for the control; 5.00 t/ha for D1; 8.00 t/ha for D2 and 11.02 t/ha for D3. Survival of Leucinodes orbonalis larvae after application of the castor oil solution was 92%, 20%, 10% and 0% respectively for the control, D1, D2 and D3. Analysis of the results shows that the 7.5 l/ha dose of castor oil can be a good biopesticide for controlling Leucinodes orbonalis.

Author(s) Details:

Camara Mamadi Mariame,
Joseph KI-ZERBO University of Burkina Faso / Environmental Physics and Chemistry Laboratory, 03 BP: 7121, Ouagadougou, Burkina Faso and Higher Institute of Agronomy and Veterinary, Plant Protection Laboratory, BP: 131, Faranah, Conakry, Republic of Guinea.

Savadogo Paul Windinpsidi,
Joseph KI-ZERBO University of Burkina Faso / Environmental Physics and Chemistry Laboratory, 03 BP: 7121, Ouagadougou, Burkina Faso and National Centre for Scientific and Technological Research / Institute for the Environment and Agricultural Research (CNRST/INERA), Soil-Water-Plant Laboratory (SEP), 01 BP, 476 Ouagadougou 01, Burkina Faso.

Sangaré Lanciné,
Higher Institute of Agronomy and Veterinary, Plant Protection Laboratory, BP: 131, Faranah, Conakry, Republic of Guinea.

Please see the link here: https://stm.bookpi.org/RACAS-V5/article/view/13915