Bioscience in brief
What are intraspecific or F1 hybrids?
How do you make an F1 hybrid? II
The best lines are taken to the second stage of F1 hybrid seed development, called test-crossing.Two different inbred lines are manually crossed to each other by taking the pollen of a plant from one inbred line and placing it on the ears of a plant of a different inbred line. The resulting seeds are collected, and the resulting F1 hybrid plants are grown the following year for assessment. A large number of crosses are made with the aim of selecting the cross that result in F1 hybrid seeds that produce plants combining all the agronomic requirements needed, and higher yields than both parent. As with the previous step, most crosses are discarded because they do not represent an improvement on existing seed varieties.