低磷胁迫下小麦根系反应的基因型差异

THE GENOTYPIC DIFFERENCES IN RESPONSE OF WHEAT ROOT SYSTEM TO LOW-PHOSPHORUS STRESS

本研究采用液培、根际原位显色和离子耗竭技术等方法,探索了小麦不同基因型根际对磷酸三钙的溶解作用,根际分泌酸性磷酸酯酶,根际氧化还原活力以及吸磷动力学的差异。结果表明,磷高效基因型不仅根系发达,而且溶解磷酸三钙的能力、酸性磷酸酯酶的分泌量和活性,对还原态甲烯蓝的氧化作用,对TTC的还原作用和吸磷动力系参数中的Imax等都显著优于磷低效基因型。有机碳分泌量高,对钙的吸收速度快也是磷高效基因型的重要特性。

Wheat genotypic differences were studied in solving tricalcium phosphatase, excreting acid phosphatase and redox activity in rhizosphere in hydroponics, in situ visualization. Phosphorus influx kinetics was genotypically compared as well in ion depletion technique. The efficient genotypes such as Lovrin 10 won a marked advantage over the inefficient ones such as Chinese Spring not only in root morphology but also in physiology and biochemistry: amount of solving tricalcium phosphate, excretion and activity of acid phophatase, oxygenation capacity of reduced methylene blue (MEB), reducing ability to 2,3,4-triphenyl tetrzolium chloride (TTC), Imax among P influx parameters etc. Moreover, 25%~30% higher in excretion of organic carbon from the root and 97.41%~151. 10% quicker rate of Ca influx were both very important characters of effcient genotypes.