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Effects of Gibberellic Acid on Dwarfs of Lowland Switchgrass, Panicum virgatum L.¹

Dwarfs of lowland switchgrass, Panicum virgatum L., approached, but did not attain, normal vegetative growth when repeatedly sprayed with gibberellic acid. Treated dwarfs usually headed but required longer to do so than normal plants; untreated dwarfs usually failed to head. Panicles of treated dwarfs were abnormally compact and frequently failed to emerge completely; florets did not undergo anthesis. Treated dwarfs producd more culms than did untreated dwarfs or normal plants. Response to variations in application rate, absence of apparent tissue injury, and the close approach to normality attained in some instances suggested that essentially normal vegetative growth could be induced in dwarfs through carefully controlled application of gibberellic acid.

Key Words: Gibberellin • Grass • Growth • Growth regulator • Plant development • Plant size

² Associate Professor of Agronomy, Agronomy Department, Kansas State University, Manhattan, Kansas 66502.

Received for publication August 21, 1971.