The role of leaves in sex expression in hemp and spinach.

When shoots of young plants of hemp (Cannabis sativa L.) and spinach (Spinacea oleracea L.) were cultured as cuttings and allowed to regenerate advenitious roots, ca.

The role of roots in sex expression in hemp plants.

When the shoots of young hemp (Cannabis sativa L.) plants were cut off the roots, cultured as cuttings, and regenerating (adventitious) roots were removed as soon as appearing, ca. 80-90% of the plants became male (had staminate flowers) whereas if the roots were allowed to develop a similar percentage became female (pistillate flowers).

The influence of growth regulators absorbed by the root on sex expression in hemp plants.

Application, through the root system, of growth regulators to hemp (Cannabis sativa L.) plants having 2-3 pairs of visible leaves caused pronounced shifts of sex expression in the adult individuals. Treatment with gibberellic acid (25 mg/l) resulted in more than 80% of the plants being male, i.

Effect of growth regulators and role of roots in sex expression in spinach.

When 7-d-old plantlets of spinach (Spinacia oleracea L.) were immersed with their roots for 24 h in 25 mg/l gibberellic acid (GA3), or 15 mg/l 6-benzylaminopurine (6-BAP), or 15 mg/l indole-3-acetic acid (IAA), or 10 mg/l abscisic acid (ABA) and subsequently grown on long (18-h) days, the ratio of plants with male and female flowers, which in the controls was almost 1:1 (48 and 52%, respectively), was greatly altered. The treatments with 6-BAP, IAA and ABA raised the percentage of female plants to 88, 76 and 71%, respectively; the GA3 treatment increased the percent of male plants to 79%.