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Tiller Senescence and Grain Development in Barley¹

Two near-isogenic barley cultivars segregating for male sterility were employed to study tiller senescence. This plant material made possible the simultaneous comparison of fruiting and nonfruiting plants without resort to debudding or mechanically removing flowers or fruits. The number of living tillers and tiller mortality was similar in fertile and sterile plants until some 10 days after awn emergence. Between jointing and awn emergence, extensive tiller senescence occurred in fertile and in sterile plants alike. This senescence is not attributable to the mobilization of nutrients into the developing fruit. The triggering mechanism for the preheading shoot senescence appears to be operative at initial stages of floral development and before mechanical debudding is feasible. Ten days to 2 weeks after awn emergence, new tillers arose rapidly on the male-sterile plants. Renewed tillering on the fertile plants was delayed an additional 3 weeks.

Key Words: shoot mortality • caryopsis development • tillering in male-sterile barley

² Professor of Agronomy, University of California; formerly Research Assistant (now Assistant Crops Physiologist, Department of Plant Sciences, University of Idaho); and Research Agronomist, Crops Research Division, ARS, USDA, and Associate in Agronomy, University of California, Davis, Calif.

Received for publication October 18, 1966.