为了调控稻根发育,观察了稻根的发育和不同生态条件的稻根形态。 (一)稻根发育动态供试品种为汕优63,采用沙培。拔节前每1-2天取样一次,拔节后每3-4天取样一次,洗去根际沙粒,剥离分蘖,保存主茎的完整根系。用刀片切取不同节间单元的稻根,置于立体显微镜下观察并计数各级分枝根的数量,结果明确: 1.稻根分枝十分发达。从芽鞘单元到地上部第一伸长节间-13/0单元的节间上,各长出数条不定根,称为冠根或一次根。一次根伸长到一定程度,可分枝长出侧根,称为二次根。其中粗 In order to control the development of rice roots, the development of rice roots and the morphology of rice roots under different ecological conditions were observed. (A) rice root development dynamic test varieties Shanyou 63, the use of sand culture. Samples were taken every 1-2 days before the jointing and once every 3-4 days after jointing. The rhizosphere sand was washed away and the tillers were stripped to preserve the complete root system of the main stem. Inoculation of rice internodes of different internode units with a razor blade was carried out and observed under a stereomicroscope to count the number of branching roots at all levels. The results were clear: 1. The rice root branch was well-developed. From the bud sheath unit to the ground above the first internode -13 / 0 unit internodes, each grow a few adventitious roots, known as the crown or a root. A root elongation to a certain extent, branches can grow lateral roots, known as the secondary root. Which thick