关键词: 水稻表层根系性状, 无损测量, 移动成像暗室, 图像处理, 植物表型组学

Abstract: Rice root traits have relations with yield, which will become one of the trends for future research to improve rice varieties by root system breeding. In order to study  the relevant traits of rice root system, this paper designed a method to dynamically and non-destructively measure surface root traits of rice plants. Planting rice varieties in transparent PMMA tubes, 27 surface root traits could be obtained through combining visible light image with processing technology. The results showed that surface roots growth rate at 32~42 d reached the maximum, then they grew slow down or became dead. The centroid got down faster in 22~54 d, and then followed by little changes. The ratio between surface root area and above ground area had similar normal distribution relation with its yield. When the ratio was between 0.45~0.65, the yield was higher. The surface root coverage decreased from top to bottom, but different rice varieties had different surface roots distributions. The coverage rate of the surface root at top areas were varied from the maximum 45% to the minimum 25%. This paper preliminarily explored nondestructive measurement of rice root traits, understood in-depth rice root structure, and played certain role in promoting development of plant phenomics.

Key words: surface root traits of rice plant, nondestructive measurement, movable imaging darkroom, image processing, plant phenomics