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Vegetative Bud Activity in Blue Panicgrass¹

Bud activity (number of elongated buds) and length of shoot growth from buds were determined in rhizome, crown, and stem tissues of blue panicgrass (Panicum antidotale Retz). Three plants were selected semimonthly from a uniformly fertilized plot. From each of these plants, four samples of viable stem, crown, and rhizome buds were sampled at random. Bud activity was determined by an in vitro method, utilizing a non-nutritive agar solution. Bud activity appeared to be cyclic in nature, occurring initially in rhizome and crown areas followed by stem bud activity after the plant reached maturity, and then activity moved from the stem back to the rhizome and crown areas later in the season. Shoot growth from rhizome buds increased linearly throughout the season. Stem and bud shoot growth followed a cubic curve in relation with time, reaching a peak in late May, declining in vigor until September, and then increasing at the end of the growing season.

Key Words: Panicum antidotale • Seasonal bud growth • Bud dormancy

² Former Research Assistant (now Research Plant Physiologist, Crops Research Division, ARS, Poplarville, Mississippi 39470) and Professor, Soil and Crop Sciences Department, Texas A&M University, College Station, Texas.

Received for publication February 6, 1970.