Phosphorus Uptake and Utilisation Efficiencies of Different Wheat Cultivars Based on a Sand-Culture Screening System  

作　　者：N.K.HOWES S.E.SMITH ZHUYONGGUAN 

机构地区：[1]DepartmentofSoilandWater,TheUniversityofAdelaide,GlenOsmond,SA5064（Australia） [2]ResearchCentreforEco－EnvironmentalSciences,theChineseAcademyofSciences,Beijing100085（China） [3]SouthAustraliaResearchandDevelopmentInstitute,GlenOsmondSA5064（Australia）

出　　处：《Pedosphere》2002年第4期329-337,共9页土壤圈（英文版）

基　　金：Project supported by the CRC for Molecular Plant Breeding, Australia.

摘　　要：A sand-based culture system using rock phosphate (P) was developed to simulate the situation in alkalinesoils, with respect to the dominant P form, and five wheat cultivars (Excalibur, Brookton, Krichauff, Westoniaand Sunco) were tested in this screening system to compare their P uptake and utilisation efficiencies. Resultsshowed that these cultivars differed significantly in their ability to acquire P from the sparingly available form(rock phosphate in this case). The accumulation of P by Brookton was three times that by Krichauff. Pconcentrations in plant tissues did not differ significantly, indicating that all cultivars were similar in Putilisation efficiency. A further experiment showed that the greater ability of a cultivar to take up P fromsparingly available form was related to the ability of a cultivar to acidify the rhizosphere. Seed P content wasa confounding factor in this system, and the use of relatively uniform seed with similar P content, preferablylow, was conducive to a successful outcome of the screening process.A sand-based culture system using rock phosphate (P) was developed to simulate the situation in alkaline soils, with respect to the dominant P form, and five wheat cultivars (Excalibur, Brookton, Krichauff, Westonia and Sunco) were tested in this screening system to compare their P uptake and utilisation efficiencies. Results showed that these cultivars differed significantly in their ability to acquire P from the sparingly available form (rock phosphate in this case). The accumulation of P by Brookton was three times that by Krichauff. P concentrations in plant tissues did not differ significantly, indicating that all cultivars were similar in P utilisation efficiency. A further experiment showed that the greater ability of a cultivar to take up P from sparingly available form was related to the ability of a cultivar to acidify the rhizosphere. Seed P content was a confounding factor in this system, and the use of relatively uniform seed with similar P content, preferably low, was conducive to a successful outcome of the screening process.

关 键 词：phosphorus efficiency sand-culture UPTAKE wheat genotypes 

分 类 号：S512.1[农业科学—作物学]