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_______ TISSUES - mbihzad_1_

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_______ TISSUES - mbihzad_1_ Powered By Docstoc
					‫مكونات أخرى لنسيج الخشب‬
                    ‫برانشيمية الخشب‬




                       ‫ألياف الخشب‬
‫ثانيا ً نسيج اللحاء‬
                      ‫الوظيفة ؟‬   ‫‪‬‬

                        ‫الشكل؟‬    ‫‪‬‬
A symplastic loader
Apoplastic loading
Normal cane (left) showing healthy phloem
and xylem tissues subtending bark. Cane on
right has been exposed to damaging cold and
shows evidence of phloem tissue injury as
discoloration beneath the brown bark.
EAB larvae feed on the
phloem tissue or inner
bark layer, disrupting the
flow of nutrients and
eventually killing the
tree.

				
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