Abstract
The ultrastructure of young plastids in shoot apices of a genetic albino strain of Nicotiana was examined by transmission electron microscopy. Typical young plastids were variable in shape and contained prolamellar bodies in various stages of organization. Thylakoids were few in number, some originating from the prolamellar body while others appeared free in the densely ribosomal stroma. Peripheral areas of the young plastids contained electron-transparent vesicles and tubules which were either in proximity or connected to the inner plastid envelope. Osmiophilic globules occasionally occurred in association with prolamellar bodies. Relatively large starch grains were common; cytoplasmic invaginations into the plastids were less common. Young plastids in the genetic green shoot apex closely resembled those of the genetic albino. These results indicate that organization of large-type grana in plastids of mature phenotypically green, genetic albino leaves occurs beyond the apex stage of germinated seedlings of this strain of Nicotiana.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
