The Occurrence of Endogenous Rhythms in the Coleoptiles in Various Cereal Genera |
| |
Authors: | BALL, N. G. DYKE, INGA J. WILKINS, M. B. |
| |
Abstract: | The rate of growth of the coleoptiles was determined from photographstaken by infra-red radiation. CO2 output was measured by meansof an infra-red gas analyser. The rhythm of CO2 output from the coleoptile of Avena was inducedby a change from red light to darkness. It has a period of about24 hours and agrees in timing with the growth-rate rhythm previouslyrecorded. Some degree of rhythmicity in the growth-rate was found in Triticumvulgare (var. Eclipse) and in Secale cereale (var.Petkus). Very slight indications of rhythmicity were found inTriticum spelta and in Hordeum vulgare. Negative results wereobtained with Oryza sativa and with Zea mays. Where rhythmicityin the coleoptile is less strongly developed, the peaks comecloser together, the interval being about 1820 hours.Cereals cannot be sharply separated into two groups accordingto the presence or absence of rhythmicity in the coleoptile.Of the genera examined, the most marked endogenous rhythms occurin Avena. It is doubtful if the ability of the coleoptile toexhibit an endogenous rhythm has any beneficial effect on thedevelopment of the seedling. Under normal conditions of germinationinduction of the rhythm would not occur. |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|