2.2 Comparison of xylem and phloem transport o 2. 2. 1 Some generalizations and useful comparisons can be o made about the composition of xylem and phloem exudates
2.2 Comparison of xylem and phloem transport ⚫ 2.2.1 Some generalizations and useful comparisons can be ⚫ made about the composition of xylem and phloem exudates
Xylem and phloem transport streams can be sampled by several methods (A) (B) Retaining C 8 tube Silicone rubber Stem Vacuum Pressure chamber Pot
Xylem and phloem transport streams can be sampled by several methods
A) 1 mm
Table 2.2 General characteristics of Xylem and phloem exudates Phloem exudates Xylem exudates Sugars 100-300g ● Amino acids5-40g1 01-2g Inorganics 0.2-4gl-1 ● otal solutes 250-1200mmol kg 10-100mmol kg ●pH p 7.3-8.0 5.0-6.5
Table 2.2 General characteristics of xylem and phloem exudates ⚫ Phloem exudates Xylem exudates ⚫ Sugars 100-300gl-1 0gl-1 ⚫ Amino acids 5-40gl-1 0.1-2gl-1 ⚫ Inorganics 1-5gl-1 0.2-4gl-1 ⚫ Total solutes 250-1200mmol kg-1 10-100mmol kg-1 ⚫ pH 7.3-8.0 5.0-6.5