Corn Breeding (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Corn Breeding

The pollen grain germinates soon after it becomes lodged on the exposed silk of the ear shoot. A pollen tube develops rapidly and enters the silk. It then grows down through the silk, and finally into the embryo sac, where the end is ruptured. The two sperms reach the embryo sac by means of the pollen tube. One' of the sperms unites with the egg, and the other unites with the two polar nuclei. The embryo or germ develops by repeated divisions of the fertilized egg, and the endosperm is produced by the division of the nucleus formed by the fusion of the second sperm with the two polar nuclei. The endosperm constitutes all of the kernel except the em bryo and the pericarp. The pericarp is developed from the ovary wall and is composed wholly of tissue of maternal origin. The different parts of the kernel are indicated diagrammatically in F igure 2.

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