Bean cultivars response to acid phosphatase test

Abstract

Roots of twenty cultivars of beans grown in presence and absence of phosphorus were submitted to acid phosphatase test. The enzymatic activity was correlated with root weight (green - RGW, dry - RDW, liquid - RLW) and total weight (green - TGW, dry - TDW, liquid -TLW). Scott-knott test 5% separated cultivars into group: high (A 286, A 247, NAG 24, Carioca, IPA 6, A 275, BAT 41, Ica Pijão, A 283, Icta Quetzal and A 294) and low (CNF 10, PVBZ 1771, A 281, EMP 84, G 4000, A 358, Puebla 152, DOR 218 and PVMX 1637) enzymatic activity. Great amount of enzyme was observed in plants developed in absence of phosphorus. Direct relationship was determined between optic density and green (r = 0.6 to 0.8) liquid (r = 0.59 to 0.79) and dry root weights (r = 0.61 to 0.81), and inverse ones between enzymatic activity and green (r = -0.81 to -0.94) liquid (r = -0.81 to -0.94) and dry root weights (r = -0.82 to -0.85).