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Photocontrol of flowering and stem extension of the intermediate-day plant Echinacea purpurea by Erik S. Runkle; Royal D. Heins; Arthur C. Cameron; William H. Carlson is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Photocontrol of flowering and stem extension of the intermediate-day plant Echinacea purpurea about?

Intermediate-day plants (IDP) flower most rapidly and completely under intermediate photoperiods (e.g., 12-14 h of light), but few species have been identified and their flowering responses are not well understood. We identified Echinacea purpurea Moench as an IDP and, based on our results, propose a novel mechanism for flowering of IDP. Two genotypes of E. purpurea ('Bravado' and 'Magnus') flowered most completely (>/=79%) and rapidly and at the youngest physiological age under intermediate photoperiods of 13-15 h. Few (/=230% as the photoperiod or NI duration increased, until plants received a saturating duration (at 14 or 1 h, respectively). Flowering was inhibited when 16-h photoperiods were deficient in red (R, 600-700 nm) light, and was promoted when photoperiods were deficient in far-red (FR, 700-800 nm) light. Because of our results, we propose the flowering behavior of IDP such as E. purpurea is composed of two mechanisms: a light-dependent response operating through light-labile (type I) phytochrome in which flowering is inhibited by an LD, and a light-stable (type II) phytochrome (i.e., phyB, D and E) response in which flowering is promoted by a short-night.

Who reads Photocontrol of flowering and stem extension of the intermediate-day plant Echinacea purpurea?

Author

Erik S. Runkle; Royal D. Heins; Arthur C. Cameron; William H. Carlson

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0031-9317)

Published

2001

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)