Studies On Mechanism Of High Phosphorus Use Efficiency Of Low-Phosphorous Tolerance Corn (Zea Mays L.) Genotypes

This research was conducted in Shandong Agricultural University and Shandong University from 2004 to 2005. It takes,as its raw material, inbreed line and hybrid combination of the low-phosphorous-tolerance corn, obtained from cell engineering technology. By comparing it with inbreed line and hybrid combination of non-low-phosphorous-tolerance corn of the same clan, a systematic research is conducted on the intake, circulation and utilization efficiency of phosphorous together with their seed production biological amount,mechanical changes of roots and the net photosynthetic ability, under treatment of different amount of phosphorus use and different type of phosphorus. A correlation analysis is also conducted between component of use efficiency ,use efficiency and different properties of corn. The major result is as follows:1. Difference in growth and phosphorus intake among different low-phosphorus-tolerance cornsExperiment on different low-phosphorus-tolerance corn inbreed line indicates: SDB and SDC are remarkably higher than SDA, SDD and Qi319 in accumulation, intake efficiency, use efficiency of phosphorus and seed production, and lower in responsibility to phosphorous and utilization efficiency. Their low-phosphorus-tolerance ability is also higher than the other three. A comparison between the two shows that SDB has a low responsibility to phosphorous and a correspondingly higher seed production than SDC, with no significant difference in seed production between the two on different phosphorous level (higher than SDC on low phosphorus level). Therefore, SDB is the best in overall properties among the four low-phosphorous-tolerance corn inbreed lines selected from the laboratory, and thus the most ideal low-phosphorous-tolerant material. It would be of great significance to conduct mechanism research on low-phosphorous-tolerance with SDB and its hybrid combination.Low-phosphorous-tolerance inbreed line with SDB and its hybrid combination, under various phosphorous conditions in the experimental design, always have higher tolerance for low...