title: Carbon dioxide requirements for phytochrome action in photoperiodism and seed germination.
abstract: 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.
authors: Department of Botany, University of British Columbia, Vancouver, V6T 1W5 British Columbia, Canada.
authors: P K
authors: PK
authors: Bassi
authors: E B
authors: EB
authors: Tregunna
authors: A N
authors: AN
authors: Purohit