Studies on resistance to shoot and fruit borer (Leucinodes orbonalis) and interspecific hybridization in eggplant.
The resistance of interspecific crosses (among Solanum incanum, S. indicum, S. gilo, and S. melongena cultivars Annamalai, Aushey, and Pusa Kranti) and resultant hybrids (Pusa Kranti × S. incanum, Pusa Kranti × S. indicum, Pusa Kranti × S. gilo, and Aushey × S. gilo) to L. orbonalis was studied in New Delhi, India [date not given]. The highest seedling infestation was observed in Pusa Kranti (20.74%) and Ashey (19.25%) while the lowest was recorded for S. indicum (6.60%) among parents and for Pusa Kranti × S. indicum among hybrids. S. indicum was immune to fruit infestation (0.0%), while Aushey (34.38%) and Pusa Kranti (31.34%) were most susceptible on a fruit weight basis. Pollen fertility and chromosomal association among interspecific hybrids were also studied. The pollen fertility of all hybrids was less than their respective parents. The frequency of univalents was highest in Pusa Kranti × S. gilo (16.73), Annamalai × S. gilo (22.60), and Aushey × S. gilo (14.40). The highest frequency of univalent coupled with high degree of sterility in these hybrids indicated the high degree of dissimilarities of parental chromosomes. The low frequency of chaisma further revealed the lack of homology between genomes.