The researchers studied different combinations of brinjal plants to see how well they grew and produced fruit. They found that some combinations showed a high level of improvement in fruit yield compared to the parent plants, indicating the importance of mixing different genes. They also discovered that some combinations had a decrease in fruit yield when the plants were closely related, suggesting the need to choose plants carefully for future generations. Overall, certain combinations like IGBL 70 x PPL and IGBO 40 x KS 327 showed significant improvements in fruit yield, while others like IGBO 40 x IVBL 9 may need further selection for better results.