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© 1979 Oxford University Press

RESEARCH-ARTICLE

Seed Germination in Amaranthus retroflexus L. as Affected by the Photoperiod and Age During Flower Induction of the Parent Plants

J. KIGEL, ARIELLA GIBLY and M. NEGBI

Department of Agricultural Botany, The Hebrew University of Jerusalem Rehovot, Israel

Seed germination in Amaranthtis retroflexus, a facultative short day plant, was affected by the parental photoperiodic conditions. Seeds from parents grown continuously in short days (SD, 8 h) had a higher dark germination and a greater response (at 30 °C) to a short irradiation or low temperature pretreatment than seeds from plants grown continuously in long days (LD, 16 h). Daily night breaks of 1 h in the middle of the long-night inhibited the SD induction of flowering as well as the SD promotion of germinability. Germinability of seeds produced by plants induced to flower in LD by 1, 2, or 3 SD was lower than that of seeds produced by plants grown continuously in SD, and decreased with the age of the parent plants at the time of flower induction.


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