以2份高耐低磷和2份对低磷胁迫高度敏感的自交系为材料,采用河沙盆栽的方法,研究低磷胁迫对玉米地上部生物学性状及伤流性状的影响。结果表明,自交系的总体耐低磷能力为178>511>>492>9782。低磷胁迫下,植株伤流强度减小,伤流液中的磷、游离氨基酸和可溶性糖的浓度和转运速度都下降,且低磷胁迫对伤流成分转运速度的影响大于对浓度的影响。耐性自交系各性状受低磷胁迫的影响小于敏感自交系。相对伤流强度、伤流液中磷、游离氨基酸和可溶糖的相对转运速度与地上部生物学性状相对值极显著正相关,可以作为玉米耐低磷特性鉴定的生理指标。
Maize inbred lines 511(HT),178(HT),492(HS) and 9782(HS) were potted in sand to study the low-P stress effect on shoot biological characteristics and bleeding traits .The results showed that ,the tolerance to low-P stress was 178>511>>492>9782.Under low-P stress,maize bleeding intensity ,concentration and transport speed of phosphorus ,free amino acid and soluble sugar in xylem sap all decreased ,and the transport speed of the ingredients decreased sharper than corresponding concentration .The influence of low-P stress on the HT lines was less than that of HS lines.The relative bleeding intensity ,relative transport speed of phosphorus ,free amino acid and soluble sugar were all highly significantly correlated with relative values of shoot biological characteristics ,therefore ,these bleeding traits could be taken as physiological index for maize tolerance to low -P stress identification .