新式旱育秧苗根的解剖学观察

Anatomy Observation of Root of new-type Dry Nursery Rice Seedling

对杂交稻汕优桂99新式旱育、传统旱育和半水育3种秧苗的根数、根长、根毛长度、宽度、密度进行考察，并对根的解剖结构，如根半径、皮层厚度、中柱大小、导管数、导管直径等进行观察、测量。经计算发现：根的总吸收面积、输水组织的横切面是新式旱育秧的最大，但皮层厚度则反之。表明新式旱育秧苗根系具有自身调节能力以适应环境变化，能够通过生长和形态结构的改变，实现水分的高效吸收和快速运输，这是新式旱育秧苗素质好的根本原因。

of seedling roots of SYG99, a hybrid rice, which were raised on new type dry bed (NDNS), traditional dry bed (TDNS) and wet bed (WNS), the numbers, the lengths,the size and the density of hair, the radiuses, the cortexs thickness, the steles size, the number and diameter of vessels were observed or measured. It was found that the absorbable area and the cross section of water conducting tissue of the new type dry bed seedling were the biggest of three seedlings, but the cortexes thickness show conversely.