The study looked at different types of veldt grape plants to see how they vary genetically and how certain traits are related to stem yield. They found that some traits like number of leaves, twiners, roots, and plant height show a lot of genetic variation and could be improved through selection. The number of lateral roots and root length have a direct positive effect on stem yield, meaning focusing on these traits could help increase the yield of veldt grape plants. Overall, the study suggests that certain traits are important for improving the yield of veldt grape plants.