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Genotypic Variations of Stylosanthes in Adaptation to Low-P Acid Soils and the Possible Physiological Mechanisms

DU Yu-mei1,BAI Chang-jun1,TIAN Jiang2,YAN Xiao-long2,LIU Guo-dao1(1 Institute of Tropical Crops Genetic Resources,Chinese Academy of Tropical Agricultura Science,Danzhou 571737,China;2 Root Biology Center,South China Agricultural University,Guangzhou 510642,China)  
In this study,a field experiment was carried out to investigate the genotypic variations of the 12 tested Stylosanthes(stylo) genotypes in adaptation to low-P acid soils and the physiological mechanisms.The results from field showed that there were significant variations of the 12 tested stylo genotypes in adaptation to low-P acid soils and these variations mainly attributed by the differences of their P efficiencies.In which,Capitata,Fine stem,Mineirao and CIAT1517 were low P efficient and non-responsive.Reyan2,Reyan5,GC1581and TPRC2001-1 were high P efficient and responsive.Seca was high P efficient but non-responsive,while the other three varieties Verano,Seabrana,and TPRC2001-2,were unstable.Based on the results from the field experiment,three genotypes contrasting in P efficiency,Fine stem,Verano and TPRC2001-1,were selected for a further nutrient solution culture.The results showed that there were significant genotypic variations in both P efficiency and P acquisition efficiency,but no in P utilization efficiency.Furthermore,low P availability could increase the activities of acid phosphatase(APase) in both leaves and roots,but it lacked of genotypic differences.It was concluded that there were significant variations of stylo in adaptation to low-P acid red soils and these variations are mainly attributed to P acquisition efficiency but not the traits of P utilization efficiency such as APase activity.
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