Relationship between the minute structure and the lodging resistance of rice stems.

The aim of this experiment is to measure the morphological and mechanical properties, and to analyze the relationship between the morphology and lodging resistance of several different kinds of rice stem. Choose the typical species of tall, mid and short stem and hybrid rice, ten individual plants each species (all should be caulis), and when paddies are full heading, intercept the third internode above the ground. The minute structure characteristics include the size of outer diameter, Culm wall thickness, and the number of big and small vascular bundles. Mechanical properties include the tensile breaking point and the tensile elastic modulus. Based on the above characteristics it is concluded that the middle stem has the highest lodging resistance. Thus when we select the high-yield and lodging resistance species, the middle and rigid stem should be considered.