Table 5: Intracellular and extracellular acid phosphatase activities in leaves and roots of barley (Hordeum vulgare L.) plants cultured 3 weeks on phosphate-sufficient (+P) or phosphate-deficient (-P) nutrient medium. Means ± SD.

Parameters 7 days 14 days 21 days
+P -P +P -P +P -P
(μmol g-1 FW h-1)
Leaf Acid Phosphatases 323 ± 44 360 ± 41.7 396 ± 15.7 411 ± 56.6 444 ± 49.4 533 ± 48*
Root Intracellular
Acid phosphatases 		113 ± 11 122 ± 15 90.4 ± 4 115 ± 7.8* 136 ± 15.5 190 ± 17.2*
Extracellular
Acid Phosphatase:
Intact Root 		67.5 ± 5 100 ± 6.7* 55 ± 4.6 80.4 ± 3.1* 31.8 ± 1.2 75 ± 3*
Extracellular
Acid Phosphatase:
Root Tips 		119 ± 5 201 ± 8* 85.5 ± 3.5 187 ± 4.4* 110 ± 8.2 193 ± 15.6*

* Significantly different at 0.05