Question anybody know about Lumen

[paul kelly]

has anyone heard of tree lumen before? i have a question for an assignment!

Here it goes describe 2 disadvantages of large tree lumen?

 

i think it is present in secondary xylem vessels possibly to do with leaf flush

any help would be appreciated:

[sloth]

What level are you studying? The lumen is the 'space' in the zylem which conducts fluids etc to the shoots/leaves. I'm sure no one wants to give you an answer! Think along the lines of fungi take advantage of aerated/drought stressed volumes of wood, for example. Or picture yourself as a leaf sucking fluids and nutrients through a small, medium or large diameter straw/tube...

 

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[Dean Lofthouse]

Thylakoid lumen

 

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[Paul Melarange]

Good answer from Sloth. Dean is also right in saying that there is a thylakoid lumen, but that is in the chloroplast and as you may already know is site of the light dependant reactions of photosynthesis.

 

Try comparing xylem vessels and tracheids. Also think about how xylem differs in ring porous and diffuse porous. If you're still struggling after that investigate 'cavitation'. 😀