thorny question

Allan Shanfield anshanfield at UCDAVIS.EDU
Wed May 17 06:59:54 CDT 2000

If thorns are often modified leaves with photosynthetic tissue, maybe it's
where ps and respiration occurs. Also, when thorns are modified epidermal
structures, often they are filled with chloroplasts; perhaps w/similar
functions. Wouldn't thorns in a dry climate lower the surface to area
ratio, modifying the boundary later - thus conferring a xerophytic

Guesses from a non-physiological ecologist.

Allan Shanfield

Env. Hort.
UC Davis

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