Abstract
This experiment was made on the strength of plumule-elongation using unbonded gauge type transducer and automatic null balancing recorder. The materials used were rice, wheat, barley, rye, oat, corn, sorghum and italian millet plants. The plumules of each cereals were raised under the soil containing 11 percent moisture at 25°C or 27∼29°C. Soil covering was 2∼6 cm. At four different growing stages of plumule, the strength of plumule-elongation was measured in darkness at 30°C. The length of plumule at four different growing stages were 1.0∼1.7 cm, 2.4∼3.0 cm, 3.7∼4.3 cm and 5.0∼6.0 cm. Results are as follows : 1. In all stages the strength of plumule-elongation was strongest in corn plants and weakest in italian millet plants. The strength of another cereals differed in each growing stage (Table 2). 2. The strength of plumule-elongation decreased with the growth of plumules. It was more evident in the cereals which did not elongate mesocotyl than in the cereals which elongated mesocotyl (Table 3). 3. Among these cereals, possitive correlations were obtained between the strength of plumule-elongation and a seed weight, and between the strength and the basal diameter of the plumule respectively (Table 4).
