不同小麦品种的根系生理特性,磷的吸收及利用效率对产量影？…

不同小麦品种的分蘖数、叶片数、干物量与根系总吸收面积及活跃吸收面积呈正相关，在低磷处理的相关性均达到显著水平。此各品种收获得期的干物量及籽粒产量亦与株吸磷量及利用效率呈正相关。通过各因素的比较，鉴定出在低磷条件下可获较高产量的品种。

A study on the physiological properties of root systems in various wheat varieties and the effects of their phosphorus uptake and utilization efficiency on the yields

In the experiment using wheat cultivars,plant tiller,leaf numbers and biomass were found to be in a significantly positive correlation to the total absorbing area and active absorbing area of their root systems as treated at a lower level of phosphorus,as well as the biomass and grain yield were found to be in a positive correlation to the phosphorus uptake and utilizing efficiency.By the comparison of different factors,some wheat cultivars were identified to give a higher yield even under a condition of lower phosphorus availability.It can be concluded that in the north area of China where there is an alkaline soil distributed with a lower level of available phosphorus,the content of organic acids surrounding the root systems of various wheat cultivars was found to be in a significant positive correlation to the yield of grain,and both the total uptaking area and active uptaking area of root systems are the important physiological features to enhance the growth and development of plant.In addition,for different wheat cultivars grown either in a soil of highly available phosphorus or in a soil of lowly available phosphorus,the biomass of their plant and the grain yields were found to be in a positive correlation to the phosphorus uptaking and utilizing efficiency.Particularly under the condition of lower phosphorus available,such a correlation was at a significant level.As studied in the pot test using 10 different wheat cultivars,several of them have been identified which are different in phosphorus uptaking and utilizing efficiency.