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Phloem-carbohydrate assay

Bill Williams WEWilliams at smcm.edu
Wed Feb 27 12:50:32 EST 2002

Dear Plant-Eders,

We've just incorporated a phloem carbohydrate-analysis unit to our 
introductory biology sequence. Students cut off six-week cucurbit 
leaves, collect the exudate into micro-capillary tubes, and use 
anthrone reagent to test for total carbohydrates, comparing against 
sucrose standards using Sequoia-Turner spectrophotometers. It worked 
(although only after we changed from water to 60% ethanol for 
diluting our exudate and making our standards), but the students had 
great difficulty getting enough exudate. Does anyone know tricks for 
increasing the amount of exudate? Are there particular species or 
varieties that work better than others? Tricks about light/dark 
cycles or time of day or watering regimes or something?


Bill Williams
William E. Williams WEWilliams at smcm.edu
Biology Department
Saint Mary's College of Maryland
18952 E. Fisher Rd.
Saint Mary's City, MD  20686-3001


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