Abstract
Scanning electron microscopy was used to investigate the structure of normal and reaction wood of Cupressus arizonica Greene, Pinus canariensis C. Sm., and P. radiata D. Don. The wood of P. radiata was examined before and after various chemical treatments. These included chlorine water-sodium hydroxide, glacial acetic acid-hydrogen peroxide, sodium hydroxide-sodium sulphide, 17.5 % sodium hydroxide, 78 % phosphoric acid, 72 % sulphuric acid, 1 % osmic acid, and 2% potassium permanganate. The helical ribs of the S2 layer in reaction wood cells appeared to be multistranded. Warts tended to become fewer and restricted to the grooves in the S2 layer during the change-over from normal to reaction wood cells. The origin and chemical composition of the warts and associated membrane are considered.
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.
