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Physiological and Biochemical Diferences in Deteriorating Barley Seed¹

New and aged seed lots of four barley (Hordeum vulgate L.) varieties were used to evaluate physlological and biochemical differences (percent germination, shoot growth, sensitivity to accelerated aging, respiratory rates, and amylase activity) in deteriorating seeds. Natural aging decreased percent germination in two varieties but caused little or no difference in the others. Only small differences (0 to 16%) were found in shoot length between the seedlings from new and old seeds. The older seeds were most sensitive to accelerated aging than newer seeds, even when no differences were found in percent germination or shoot growth. Oxygen uptake varied and did not seem to correlate with either percent germination or age. Older seeds evolved up to 200% as much CO₂ as newer seeds, and had higher respiratory quotient's (RQ). After 36 hr germination newer seeds showed 46 to 67% more total amylase activity than older seeds

Key Words: Accelerated aging • Amylase • Deterioration • Respiration • Storage • Vigor

² Plant Physiologist, Seed Quality Investigations, Field Crops and Animal Products Research Branch, Market Quality Research Division, ARS, USDA, Beltsville, Md. 20705.

Received for publication June 5, 1969.