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Growth and Nitrate Assimilation in Oats as Influenced by Temperature¹

The effects of several day/night temperature regimes on growth and nitrate assimilation of three cultivars of oat (Avena sativa L.) plants from planting until panicle emergence were studied. Panicles emerged first in ‘Jaycee,’ then in ‘Portal,’ and last in ‘Froker’ at all temperatures. More tillers were formed at 13/13 C day/night temperatures than at warmer temperatures, except that Froker tillered most at 28/23 C. At cooler temperatures, Jaycee had more tillers than the other cultivars, and at warm temperatures, Froker had the most. Dry weights of culm plus leaf sheath fractions were similar for all cultivars, but dry weights of leaf blade fractions were greater for Froker than for Portal or Jaycee. This difference increased with increasing temperature. Reduced-N (total-N minus nitrate-N) concentrations of vegetative parts at panicle emergence did not vary greatly with cultivar or with temperature, except at the high and low extremes. Reduced-N concentrations of leaf blades were higher than those of culms and leaf sheaths. Froker exceeded the other cultivars in total reduced-N per shoot, especially at warmer temperatures, largely because of greater leaf blade dry matter.

Key Words: Avena sativa L. • Nitrogen • Dry weight • Tillers • Panicle emergence

² Plant Physiologist, ARS, USDA, and Assistant Professor of Agronomy; and Associate Professor of Agronomy.

Received for publication April 19, 1974.

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