Kinetic parameters of silicon uptake by rice cultivars

Revista Brasileira de Ciência do Solo

Priscila Oliveira Martins¹  Carlos Alexandre Costa Crusciol¹  Cristiane Pilon¹ 

[1] ,UNESP College of Agricultural Sciences Department of Crop ScienceBotucatu SP ,Brazil

关键词: Oryza sativa L.;    uptake efficiency;    utilization efficiency;    Oryza sativa L.;    eficiência de absorção;    eficiência de utilização;   

DOI  :  10.1590/S0100-06832012000100016

来源: SciELO

【 摘 要 】

Silicon is considered an important chemical element for rice, because it can improve tolerance to biotic and abiotic stress. However, in many situations no positive effect of silicon was observed, probably due to genetic factors. The objective of this research was to monitor Si uptake kinetics and identify responses of rice cultivars in terms of Si uptake capacity and use. The experiment was carried out in a greenhouse of the São Paulo State University (UNESP), Brazil. The experiment was arranged in a completely randomized, factorial design with three replications. that consisted of two rice cultivars and two Si levels. Kinetic parameters (Vmax, Km, and Cmin), root morphology variables, dry matter yield, Si accumulation and levels in shoots and roots, uptake efficiency, utilization efficiency, and root/shoot ratio were evaluated. Higher Si concentrations in the nutrient solution did not increase rice dry matter. The development of the low-affinity silicon uptake system of the rice cultivar 'Caiapó' was better than of 'Maravilha'.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License