Carbon dioxide requirements for phytochrome action in photoperiodism and seed germination.
نویسندگان
چکیده
The effect of interrupting darkness with red light in the presence or absence of 0.03% CO(2) was studied in relation to flowering of Xanthium pennsylvanicum and germination of light-sensitive lettuce seeds. The results indicate that CO(2) is essential for red light to be effective in either process.
منابع مشابه
The role of phytochrome in an interaction with ethylene and carbon dioxide in overcoming lettuce seed thermodormancy.
Ethylene and CO(2) were used to control induction of germination in thermodormant lettuce seed (Lactuca sativa L.). These experiments ultimately showed that germination depends on the presence of an active form of the phytochrome. The phytochrome system is functional and stable at 35 C, a temperature which completely inhibits germination. Phytochrome responses to red or far red light and darkne...
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Ethylene increased the germination of freshly imbibed lettuce (Lactuca sativa L. var. Grand Rapids) seeds. Seeds receiving either red or far-red light or darkness all showed a positive response to the gas. However, ethylene was apparently without effect on dormant seeds, those which failed to germinate after an initial red or far-red treatment. Carbon dioxide, which often acts as a competitive ...
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1. BORTHWICK, H. A., S. B. HENDRICKS, M. WV. PARKER, E. H. TOOLE, & VIVIAN K. TOOLE. 1952. A reversible photoreaction controlling seed germination. Proc. Natl. Acad. Sci. 38: 662-666. 2. BORTHWICK, H. A., S. B. HENDRICKS, E. H. TOOLE, & VIVIAN K. TOOLE. 1954. Action of light on lettuce seed germination. Botan. Gaz. 115: 205-225. 3. FLINT, L. H. & E. D. 'MCALISTER. 1937. Wavelengths of radiation...
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Action spectra were measured for suppression of germination of Poa pratensis L. and Amaranthus arenicola I. M. Johnston seed under prolonged or continuous irradiation. The action maxima for both types of seeds are near 720 nm. The maxima are unchanged in position or magnitude in the presence of radiation in the region of 600 to 670 nm adequate to maintain phytochrome predominantly in the far-re...
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Phytochrome control of cucumber seed germination is temperature-dependent. A prolonged exposure to radiation from broad spectrum far red sources (Pfr/P = 0.05 to 0.07) prevents germination at temperatures below 20 C. Above 20 C there is no inhibition and it appears as if there is an escape from phytochrome control. However, radiation from a monochromatic, narrow band 730 nanometer source (Pfr/P...
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ورودعنوان ژورنال:
- Plant physiology
دوره 56 2 شماره
صفحات -
تاریخ انتشار 1975