wth oH |

The "A," State of at.

Single Kernel from 7774D-4 x 7818B-4 4
eng riat"

To illustrate cycles of activity of Spm in single kernel.

Parent (pollen) introduced active Spm. ” One-half of “kernel
Spm started*inactive;tother“half of “kernel started with, “active
Spm. The half with inactive Spm is pigmented in which small
colorless (=active Spm) appear. In these small colorless areas
smaller pigmented spots (= inactive Spm) appear. “his sequence
illustrates changes in activity of Spm from active » inactive >
active » inactive.

the opposite side of the kernel shows the reciprocal type of
change: from colorless (active Spm) to small pigmented spots (=

inactivations of Spm).