水培条件下硫素营养对粳稻米质的影响

 【目的】探讨水培条件下,硫素营养对粳稻稻米品质的改善作用,明确其品质指标随硫素浓度改变而变化的规律,以期提高人们对硫肥的重视,为硫肥的精确合理施用奠定理论基础。【方法】以粳稻武粳15和武育粳3号为材料,采用水培法,研究硫素营养对粳稻稻米品质指标的影响。【结果】在适宜营养液硫浓度下,武粳15和武育粳3号的稻米品质得到显著改善。武粳15和武育粳3号分别在200 μmol?L-1和260 μmol?L-1硫浓度处理下,加工品质、外观品质指标得到显著改善,与对照相比,胶稠度分别增加了12.1 mm和8.4 mm。在米粉糊化特性上,武粳15在200 μmol?L-1硫处理的米粉峰值粘度较对照增加143 cP,消减值降低290 cP。武育粳3号在260 μmol?L-1硫浓度处理下,米粉的峰值粘度较对照增长158 cP,消减值降低34 cP。两个品种籽粒蛋白质含量及总游离氨基酸含量随硫浓度的升高呈增加的趋势,4种蛋白组分含量与硫浓度总体上呈正相关关系。【结论】200 μmol?L-1硫处理的武粳15和260 μmol?L-1硫浓度处理的武育粳3号,其品质相关理化指标得到较好的改善。

Effects of Sulfur on Rice Quality of Japonica Rice Under Solution Culture Conditions

【Objective】 The study was conducted to investigate the improvement of sulfur nutrition on rice quality of japonica rice cultivar and find out the change tendency of japonica rice cultivar's quality with sulfur concentration increasing in solution culture. And it was also hoped it could make people give enough attention to sulfur fertilizer and give guidance for sulfur fertilizer' accurate and rational application. 【Method】 Solution culture method was used to study the effect of sulfur on physiochemical properties of rice grain of two japonica rice cultivars, Wujing15 and Wuyujing3. 【Result】 The results showed that Wujing15 and Wuyujing3 rice quality were improved significantly under rational sulfur concentration. Milling quality and appearance quality were improved remarkably, under 200 μmol S?L-1 treatment for Wujing15 and 260 μmol S?L-1 for Wuyujing3, in comparison with 80 μmol S?L-1 treatment. In comparison with 80μmol S ?L-1 treatment, the gel consistency increased by 12.1mm and 8.4mm for Wujing15 and Wuyujing3, respectively. For Wujing15, the peak viscosity increased by 143 cP, setback decreased by 290 cP. For Wuyujing3, the peak viscosity increased by 158 cP, setback value reduced by 34 cP, in comparison with 80 μmol S?L-1 treatment. Additionally, the protein contents and total amino acid contents increased with S concentration increasing for both cultivars, in comparison with 80 μmol S?L-1 treatment. The two rice cultivars' four protein fractions content of the two rice cultivars had positive relationship with sulfur concentrations on the whole. 【Conclusion】Under 200 μmol S?L-1 treatment for Wujing15 and 260 μmol S?L-1 for Wuyujing3, the physiochemical properties of grain of the two cultivars had substantial improvement.