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Jointing and Survival of Rye Plants and Clones Through Successive Seasons¹

Clones can be used in rye improvement if portions are preserved vegeatively long enough for evaluation and use in breeding. Plants and clones of ‘Von Lochow’ and ‘Caribou’ rye were observed in the greenhouse under 8-hour, natural, and 24-hour days. Continuous light prevented jointing of both varieties. Natural daylength prevented jointing of Von Lochow. Survival of over-summering clones was best in full shade and natural daylength, poorest in full shade with continuous artificial illumination, and fair in partial shade with natural daylength. Some segments of all clones over-wintered successfully in the field. Jointed tillers winterkilled but had no apparent effect on adjacent vegetative tillers in the same clonal segment.

Key Words: cloning • propagation • daylength • tillering • heading • breeding

² Professor, Associate Professor, and former Graduate Assistant, Agronomy Department, South Dakota Agricultural Experiment Station, Brookings, S. D.

Received for publication February 27, 1967.