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Influence of Heat Stress During Seed Maturation on Germinability of Barley Seed at Harvest¹

A germination response to high temperature stress at stages of seed maturation is demonstrated in barley (Hordeum vulgare L.). The germination of freshly harvested seed is depressed following heat stress at 7 to 10 days after awn emergence, but is enhanced by the same stress applied 3 weeks after awn emergence. The depression is attributed to reduced viability associated with thermal injury. The stimulation following stress at more mature stages of seed development is related to a thinner seed coat, increased permeability as evidenced by faster imbibition rate, and decreased watersoluble inhibitor content of the seed. These effects of environmental stress during seed maturation aid in explaining differences noted in the germinability at harvest of seed produced in successive years or produced in the same year at different locations.

Key Words: Seed development • Seed dormancy • Seed germination • Heat sensitivity

² Formerly graduate student, now Senior Lecturer, Department of Agronomy, West Pakistan Agricultural University, Lyallpur; and Professor of Agronomy, University of California, Davis, California 95616.

Received for publication May 5, 1968.