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本文运用水培,同位素示踪和离子耗竭技术,对杂交水稻成优35K~+吸收进行了动力学分析和根系生长动态的测定。结果表明,与常规稻湘矮早9号相比较,威优35的根系生艮表现出明显的杂种优势。以单位根重计算各生育阶段的动力学参数,米氏常数Km值,最大吸收速率Vmax和最小浓度Cmin,两品种间均无显著性差异,但以单株吸收速率比较,威优35在分蘖期的吸钾速率大于湘9。随着水稻生长发育,Km值显著增加,Vm8x显著减少,但单株吸K~+速率显著增加。由此表明,杂交水稻吸钾对根系生长参数(根重、根数和根长)敏感,而对动力学参数的影响较小。杂交水稻威优35和常规稻湘9在高低浓度范围的吸钾量与K~+浓度的关系都表现出明显的。“二重图型”,而同位素(86)~Rb标记法测定的结果表明,仅在低浓度范围内的吸钾速率和常规法测定的结果一致。
In this paper, using hydroponics, isotope tracing and ion depletion techniques, kinetic analysis and root growth dynamics of hybrid rice with excellent 35K ~ + absorption were studied. The results showed that compared with the conventional rice Xiang short morning 9, Weiyou 35 root gen-set Gen showed obvious heterosis. The dynamic parameters, the Km value, the maximum absorption rate Vmax and the minimum concentration Cmin of each growth stage were calculated by the unit root weight. There was no significant difference between the two varieties. However, compared with the single plant absorption rate, Period of potassium absorption rate is greater than Hunan 9. With the growth and development of rice, Km value increased significantly, Vm8x decreased significantly, but K ~ + rate of single plant increased significantly. The results showed that potassium uptake of hybrid rice was sensitive to root growth parameters (root weight, root number and root length), but had little effect on kinetic parameters. The relationship between potassium uptake and K ~ + concentration in both high and low concentration rice lines of Weiyou35 and conventional rice Xiang9 were all obvious. “Double pattern”, while the isotope (86) ~ Rb labeling method showed that the rate of potassium uptake only in the low concentration range was consistent with the results of the conventional method.