PHYTOCHROME DESTRUCTION IN DARK ‐ AND LIGHT‐GROWN <i>AMARANTHUS CAUDATUS</i> SEEDLINGS

Abstract

Abstract— Slow destruction of the far‐red‐absorbing form of phytochrome (P fr ), which has been observed in light‐grown oat and maize, occurs in light‐ and dark‐grown Amaranthus, Pharbitis , and Brassica seedlings as well. Destruction of P fr in these seedlings shows two phases: if a high level of P fr is produced in dark‐grown seedlings, the destruction is fast in the beginning and then slows after a low P fr level has been reached. Slow P fr destruction is predominant in light‐grown tissue.