Etude du phytochrome detectable,in vivodans les graines deCucurbita pepoL. au cours des differentes phases de la germination
✍ Scribed by M. Zouaghi; R. Malcoste; P. Rollin
- Publisher
- Springer-Verlag
- Year
- 1972
- Tongue
- English
- Weight
- 697 KB
- Volume
- 106
- Category
- Article
- ISSN
- 0032-0935
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✦ Synopsis
An in vivo S t u d y of Detectable 13hytochrome in Seeds of Cucurbita pepo L. in the Course of Different BBhases of Germination Summary. In dry gourd seeds all the phytochrome is in the Pfr form. The increase of phytochrome content from the beginning of hydration involves two phases, A and B, in the embryonic axis as well as in the cotyledons. Cyeloheximide does not prevent the appearance of Pr during phase A. We assume that F r is gradually released from an inactive complex. On the other hand phase B is inhibited by eycloheximide; this could mean that a de novo synthesis of Pr occurs, Some experiments indicate that the phytoehrome which is localized in the embryonic axis may be involved only in the germinating process.
The phytochrome which is synthesized during phase B disappears when the seeds are irradiated with red light, while the original phytoehrome does not.
According to our data it seems necessary to lay down a new and precise definition of the germination process.