對(duì)五優(yōu)308在不同生育時(shí)期的根系形態(tài)特征及其與常規(guī)超級(jí)稻合美占的差異進(jìn)行了分析。結(jié)果表明：除苗期外，五優(yōu)308單株不定根數(shù)和總根長(zhǎng)在各生育時(shí)期都比合美占具有明顯優(yōu)勢(shì)，但單莖根系及單條不定根性狀與合美占的差異不明顯。五優(yōu)308與合美占單株根數(shù)和總根長(zhǎng)的差異主要是由于分蘗特性的差異所致。在超級(jí)稻育種中，可在選擇適宜莖蘗數(shù)量的基礎(chǔ)上，注重選擇單莖根數(shù)較多和單條不定根長(zhǎng)較長(zhǎng)的品種。
The morphological characteristics of root system of Wuyou 308, a super hybrid rice combination, were studied at different growth stages from the seedling stage to maturity stage, with Hemeizhan, a super pure line rice variety, as the control, by a pot experiment. The results showed that Wuyou 308 had a significant superiority to Hemeizhan in the number of adventitious roots per plant and the total root length per plant at all growth stages after the seedling stage, but it was not much different from Hemeizhan in the root characters per stem and the traits per adventitious root. The difference in tillering ability was considered to result in the difference of root number and length per plant between Wuyou 308 and Hemeizhan. In super rice breeding, it might be an effective way to increase yield, on the basis of selection of sufficient tillers per plant, by selecting varieties with more roots per stem and longer adventitious roots.