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Proceedings of the International Plant Propagator's Society

Vol. 44

Title:
Seed Germination

Author:
Norman C. Deno

pp: 530-532

Abstract:
Fifteen years ago I began a study of seed germination. At present over four thousand species have been studied. These studies differ from all previous work in that variables are precisely controlled, rate curves are emphasized rather than just percent germination, and the rate curves are analyzed by chemical rate theory. The results dramatically revise concepts in the field and pave the way for highly efficient methods of propagating plants from seeds. The following examples illustrate some of the highlights of the work.

Gibberellins have a powerful effect on the course of germination for many species, and they can be an absolute requirement for germination. Many cacti such as Echinocereus pectinatus are tiny plants growing in harsh environments. To survive the blazing sun and infrequent rains the seeds must germinate in shade in a pocket of deep leaf mold. The seeds have evolved a clever method for detecting such a place. This is to require for germination a specific chemical,

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