Abstract
Three different patterns of differentiation were respectively characteristic of the three types of xylem parenchyma found in trembling aspen: Non-vessel-associated ray parenchyma cells formed lignified secondary walls and, generally, a lignified isotropic layer, within one growing season; axial parenchyma cells formed thickened primary walls at the end of the growing season but did not lignify, nor form secondary walls and an isotropic layer, until the following growing season; vessel-associated ray cells (contact cells) formed a lignified, outer secondary wall and an unlignified protective layer during the first growing season but did not differentiate further until heartwood formation when, following tylosis formation, lignification of the protective layer and newly developed inner secondary wall layers occurred.
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.
