PJB-1976-5
Effects of samazine, atrazine and 2,4-D on repiration rate , sugar level and amylase activity during germination of pinus nigra zar. Calabrica schneid.
S. shahid
shaukat
Abstract
The effects of triazines and 2,4-D on the
metabolism of germination pinus nigra var. calabrica seeds were investigated . in controls reducing sugsr, respiration
rate and amylase activity increased from
30 to 90 h but sucrose level declined. Although simazine did not alter the rate of oxygen update by germinating seeds,
1000 ppm altrazine suppressed the rate of oxygen consumption . at 5 and
100ppm, 2,4-D stimulated the aerobic respiration but 1000 ppm 2,4-D significantly reduced the oxygen uptake of germinating seeds. Trianzines did not change the reducing sugar content but
2,4-D at 100 ppm decreased the reducing asugar content at 30 h and increased it at
1000 ppm. Trianzines (100 and 1000 ppm) initially decreased the sucrose content , but afterwards elevated the
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