Journal of Horticultural Sciences

C. Thangamani ¹, L. Pugalendhi ¹, T. Sumathi ¹, C. Kavitha ¹

Affiliations
1 Department of Vegetable Crops, Horticultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore – 641 003, IN

Abstract

To study the combining ability and heterosis for yield and quality characters, full diallel analysis was carried out in bitter gourd during January - April 2008 (Thai pattam), with 10 diversified parents, at Research Farm, Horticultural College and Research Institute, TNAU, Coimbatore. Parental mean and gca effects revealed that the parents Preethi, CO-1, MC-30, Uchha Bolder, Green Long and MC-105 were the best genotypes for improvement of yield, combined with quality characters. Hybrids, viz., Preethi x MC-30, KR x USL, MC-105 x MC-10 and Priyanka x CO-1 registered favourable values for mean, significant sca and standard heterosis for yield and quality parameters. Hence, these hybrids are recommended for commercial exploitation of heterosis. Comparison of parental gca and sca of hybrids revealed that hybridization between good x good, good x poor, medium x poor and poor x good combiners gave rise to hybrids with significant sca effects. Considering the mean performance, sca and standard heterosis, hybrid 'Preethi x MC-30' registered favourable values for the most important characters like earliness, number of fruits, fruit yield and quality. Top performing F₁ hybrids can be tested over seasons and locations for assessing stability for high yield and quality.

Keywords

Bitter Gourd, Momordica charantia, Mean Performance, Combining Ability, Standard Heterosis.

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C. Kavitha ¹, E. Vadivel ², K. Rajamani ¹, C. Thangamani ¹

Affiliations
1 Horticultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore-641 003, IN
2 Directorate of Extension Education, TNAU, Coimbatore – 641 003, IN

Abstract

Thirty seven Coleus forskohlii genotypes collected from different regions of Tamil Nadu and Karnataka were subjected to diversity analysis based on NBPGR descriptors. Eleven qualitative and fourteen quantitative traits of C. forskohlii were evaluated to assess the morphological variations available among the collected genotypes. For qualitative traits, a large number of genotypes out of 37 clustered together at 74 % similarity in four different groups. The dendrogram contract based on fourteen quantitative traits for the same set of genotypes did not reveal a clear pattern in grouping and the genotypes were grouped into ten different clusters. Cluster analysis of various sets of data revealed different groups of genotypes for each of the data set. A poor congruence observed among data sets of qualitative and quantitative traits in the comparison indicated that the morphological traits are not suitable for precise discrimination of closely related genotypes in C. forskohlii.

Keywords

Coleus forskohlii, Morphological Traits, Cluster Analysis.

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