Studies on the Effect of Silicon Nutrition on Plant Growth, Mineral Contents and Endogenous Gibberellins of Three Rice Cultivars

摘要

Silicon is one of the key elements for healthy growth and development in rice crops. We analyzed the effect of silicon (Si) on some growth parameters, plant mineral contents, and bioactive gibberellins in three rice cultivars. Silicon was applied at the rates of 0 kg/0.1ha (control), 40 kg/0.1ha, and 80 kg/0.1ha throughout the course of experiment. Plant growth parameters were enhanced by the application of elevated Si, though plant height and culm length were more favorably affected than the respective dry weights. The plant mineral contents analyzed also increased except potassium, in all treatments where Si was applied, demonstrating that Si application promotes the absorption of these minerals in rice crops. The endogenous gibberellins measuredin our study showed that GA_1 is the only bioactive GA form present in rice seedlings. The endogenous GA_1 and its precursor GA_(20) contents increased after Si application. However, this increase in endogenous GA_1 and GA_(20) contents, and plant growthparameters were different according to the rice cultivars. Our results indicate that Si is a beneficial element in rice nutrition and that different cultivars of Oryza sativa show differential responses to Si nutrition in terms of their growth and development.