Plastid inheritance inOenothera: organelle genome modifies the extent of biparental plastid transmission
✍ Scribed by Wan-Ling Chiu; W. Stubbe; Barbara B. Sears
- Publisher
- Springer-Verlag
- Year
- 1988
- Tongue
- English
- Weight
- 873 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0172-8083
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✦ Synopsis
The transmission abilities of four out of the five major plastome types of Oenothera (I-V) were analyzed in a constant nuclear background by assessing both the frequency of biparental inheritance and the extent of variegation in the progeny. Reciprocal crosses were performed between plants carrying one of four wild-type plastomes and plants carrying one of seven white plastid mutants. The frequency of biparental plastid transmission ranged from 0 to 56% depending on the plastid types involved in the crosses. The transmission abilities of the four representative wild-type plastids appear to be in the order of I >III > II > IV in the nuclear background of O. hookeri str. Johansen. In general, variegated seedlings from crosses that produced a higher frequency of biparental plastid transmission also had an increased abundance of tissue containing plastids of paternal origin. Although the transmission abilities of most Oenothera plastid mutants are comparable to the wild-type plastids, three mutant plastids derived from species having different type I plastids show three distinguishable transmission patterns. This study confirms the significant role of the plastome in the process of plastid transmission and possibly in plastid multiplication. However, the hypothesis of differential plastid multiplication rates suggested by earlier studies can explain the results only partially. The initiation of plastid multiplication within the newly formed zygote also seems to be plastome-dependent.