How do breeders control pollination in flowers that have both stamens and pistils?

In plant breeding, controlling pollination in hermaphroditic flowers—those possessing both stamens and pistils—is essential to ensure that only the desired pollen reaches the stigma of the female parent.1

Breeders employ several methods to achieve this:

• Emasculation: To prevent self-pollination, breeders manually remove the anthers from the flowers selected as the female parent before pollen is shed. This delicate task is typically performed using tools such as forceps or scissors.1
• Physical Protection: After emasculation, the flower is covered with a paper or plastic bag to protect the stigma from "foreign" or unwanted pollen. Once the stigma becomes receptive, the breeder transfers pollen from the chosen male parent to the stigma and replaces the protective covering.1
• Cytoplasmic Male Sterility (Cytosterility): This biological system prevents the maturation or function of the stamens, resulting in defective or absent pollen. By using plants with this trait, breeders can bypass the labor-intensive process of manual emasculation, as the plant is naturally unable to self-pollinate.2

These procedures are often tedious and exacting, but they are vital for producing specific hybrid varieties.12