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Gibberellins Gibberellins are named for the fungus genus Gibberella, which causes a disease of rice in which the plants grow to be abnormally tall, this “foolish seedling disease ” of rice was investigated in the 1920s by Japanese scientists, who found that if they grew the fungus in culture, they could obtain a chemical completely free of the fungus itself that would affect the rice plants in a way similar to the fungus.

This substance, isolated in 1939 and chemically characterized in 1954, was the first of what proved to be a large class of naturally occurring plant hormones called the gibberellins. Synthesized in the apical portions of both stems and roots, gibberellins have important effects on stem elongation in plants and play the leading role in controlling this process in mature trees and shrubs. In these plants the application of gibberellins characteristically promotes internode elongation, and this effect is enhanced if auxins are also present. Gibberellins are also involved with many other aspects of plant growth, such as inducing flowering and hastening seed germination. แหล่งข้อมูล: Understanding Biology. Page 727.

โดย : นาง ปรียา ชมเชี่ยวชาญ, ศรีปทุมพิทยาคาร, วันที่ 2 กรกฎาคม 2545