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Published in Crop Sci 16:409-413 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Endogenous Growth Regulators and Summer Tillering of Tall Fescue1

Richard Y. Yeh, Arthur G. Matches and Russell L. Larson2

In the southern Corn Belt, tall fescue (Festuca arundinacea Schreb.) produces most of its vegetative growth during the spring and autumn. Generally little growth or new tiller initiation occurs during midsummer, even though the potential sites (buds) for tiller production are present. Failure of buds to elongate into tillers may be controlled by endogenous growth regulators. We investigated the influence of endogenous plant auxins on the elongation of buds into new tillers for tall fescue grown under field and growth chamber conditions. High temperature in the field and growth chamber (31/17 C) favored the accumulation of endogenous auxin in stem bases, and this appeared related to the inhibition of tiller initiation in early summer. Low temperature in the field and growth chamber (22/11 C) favored the accumulation of auxin in shoots and a high level of shoot auxin appeared related to active tiller development. Endogenous auxin levels in both shoots and stem bases were low in late summer.

Key Words: Temperature • Photoperiod • Endogenous auxin • Endogenous inhibitor

1 Contribution from the ARS, USDA and the Mo. Agric. Exp. Stn., Univ. of Missouri-Columbia. Journal Series No. 7321.

2 Research associate, North Carolina State Univ.; research agronomist and research chemist, ARS, USDA and professor and associate professor of agronomy, Univ. of Missouri-Columbia.

Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the USDA, and does not imply its approval to the exclusion of other products that may also be suitable.






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