大豆苗期耐低磷筛选指标的研究

目的]探讨简单、可靠的用于大豆苗期磷效率筛选的鉴定指标。方法]采用高、低磷土壤盆栽试验,对大豆苗期的相对株高（RPH）、相对地上部干重（RAW）、相对根系干重（RRW）、相对地上部磷浓度（RAPC）和相对根部磷浓度（RRPC）5个指标进行了研究。结果]相对株高受低磷胁迫影响较小,变异系数仅为9.07%,与其他指标的相关性未达到显著水平;相对地上部干重、相对根部干重、相对地上部磷浓度和相对根部磷浓度受低磷胁迫的影响较大,其变异系数也较大,分别为26.67%、22.68%、24.01%和15.87%,指标间的相关系数呈显著或极显著正相关。结论]相对地上部干重、相对根部干重和相对地上部磷浓度可作为综合评价大豆苗期磷效率筛选的重要指标,相对根部磷浓度可作为辅助筛选指标。

Study on the Screening Index for Low Phosphorus Tolerance at Seedling Stage

Objective] Simple and reliable identification criteria used in screening phosphorus efficiency of soybean at seedling stage was discussed. Method] Using the high and low phosphorus soil pot experiment, the soybean seedling stage's 5 criteria including RPH, RAW, RRW, RAPC and RRPC were studied. Result] Low phosphorus stress had the low effects on relative plant height, the coefficient of variation was only 9.07%, which had not achieved the remarkable level with its its criteria's relevance; Low phosphorus stress had the higher effects on relatively above-ground dry weight and relative dry weight of root, relatively above-ground phosphorus concentration and relative root phosphorus concentration, its coefficient of variation was also big, which were 26.67%, 22.68%, 24.01% and 15.87% respectively, The correlation coefficient among the indicators had significantly or extremely significantly positive correlation. Conclusion] Relatively above-ground dry weight and relative dry weight of root, relatively above-ground phosphorus concentration could be used as an important indicator of comprehensive evaluation of screening phosphorus efficiency of soybean at seedling stage, while the relative root phosphorus concentration could not be used as secondary screening index.