[Root system hydraulic conductivity of different genotype maize and its relationship with root anatomy]

Under solution culture condition and by using pressure chamber techniques, this paper studied the difference of root system hydraulic conductivity (Lpr) of different genotype maize at the level of individual root, and its relationship with root anatomy. The results showed that the Lpr of root system was different with different genotype, and there existed heterosis in F, generation. Under normal culture condition, the root with wider vessels had higher Lpr and drought resistance; while under water deficit, there was a significantly negative correlation between the width of root vessel and the Lpr and drought resistance. Under both normal and deficient water supply, there was a negative correlation between the ratio of cortex to root diameter and the Lpr and drought resistance, suggesting that root cortex was the placement with the greatest resistance to the liquid water flow in