we will investigate the role of Xylem rays (Ray parenchyma) against wood mechanical properties.
Kindly refer these books
Comparative Wood Anatomy by Sherwin Carlquist
Easu's Plant Anatomy
Definitely you will get what you search.
Moreover, these two books are the base for Plant Anatomy. So please check once if you not come across.
I am just leaving a note on basis.
Wood lignified, which gives mechanical strength to the plant. As tree grows, it increase in size and obtain non-functional center region. Non-functional region of wood became heartwood, which more in deposition and even harder. The functional vessel and tracheids occur in a few layers behind the vascular cambium, which know as sapwood. To support the sapwood from the center of tree truck, medullary rays runs horizontally towards periphery. This give mechanical support to the new functional region of xylem elements which involve in conductivity.
Some parenchyma cells also presence nearby the medullary rays to make it functional.
Kindly refer IAWA journal for related articles.
Regards
John Adams S
Dear Ehsan,
Rays are not woody component. So increasing of rays (ray parenchyma) in wood structure causes to low mechanical strength such as MOR and MOE. Also, rays can not transfer stress under loading.
i think this paper help you.
http://link.springer.com/article/10.1007/s00468-002-0193-3#page-1
yours
Saman,
you can see below link:
http://www.sciencedirect.com/science/article/pii/S0964830515300391
Ehsan
Very good research. thank you for sharing that. Let me know your idea about relation between ray percentage and mechanical properties of wood. Other question is do you think the fungi has a selectivity in wood deterioration components (i mean fibers, vessels, rays and etc.)?
Regards
Saman,
the fungal strategies in wood decomposition is the based on several conditions and in case of the white-rot fungi the major condition is commonly nitrogen and moisture content. the fungi tend to growth in the ray cells, at first and after refueling by consume of the material interior of the rays, move to the vessels and cell walls.
Ehsan
Thank you. Exactely true. Thus, increase of ray percentage in wood texture causes to loss of wood strangth versus fungi. About mechanical properties of wood, i think according to anatomical charecterstics of paranchyma, increases in paranchyma cells percentage causes to decrease the density of wood. In other words, paranchyma cell is weak point and they causes to crack initiation and propagation in wood under stress. I think this is reason for low mechanical properties in wood with highly percentage of paranchyma.
For further details about role of the rays in mechanical properties in wood, please see the below link:
http://www.springer.com/us/book/9783540620198
Regards
Ehsan
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