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The Germination Response of the Negatively Photoblastic Seeds ofCitrullus lanatusto Light of Different Spectral Compositions

Authors
Journal
Journal of Plant Physiology
0176-1617
Publisher
Elsevier
Publication Date
Volume
132
Issue
6
Identifiers
DOI: 10.1016/s0176-1617(88)80240-2
Keywords
  • Germination
  • Citrullus Lanatus
  • Phytochrome

Abstract

Summary The germination of Citrullus lanatus seeds is inhibited by far-red-, red-, blue-, green- and white light. The inhibitory effect of light (with the exception of far-red) light is alleviated by a follow-up dark treatment. In addition it was found that the inhibitory effect of far-red light could not only be alleviated by a follow up red light treatment but also by short subsequent exposure to white- and blue light. The obtained results most probably indicate that germination is inhibited by red, blue, white, and, to a lesser extent, by green light due to pigment cycling between P r and P fr. During periods of pigment cycling much of the phytochrome probably accumulates in a form which can readily change to P fr in a follow up dark treatment. It appears that due to inherent differences in the P fr-threshold value necessary for germination, negatively- and positively photoblastic seeds cannot be made the same in their light requirements for germination merely by manipulating the phytochrome concentrations with light.

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