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三系杂交稻幼苗的NH_4~+吸收速率,汕优6号〉汕优3号〉南优3号〉军优。在亲本与子代的关系上,杂交第一代(F_1)的NH_4~+吸收速率介于父本与母本之间,而偏向于父本。在NH_4~+吸收的动力学参数方面,F_1的K_m小于母本而大于父本;F_1的V_(max)都大于母本而小于父本。杂交稻的NH_4~+吸收速率受到父本的遗传影响。 汕优6号、汕优3号和南优3号的K~+吸收速率很相近而且都大于亲本,表现有杂交优势。虽然优势不是很强,但在一生中可积累很多的钾。 NH_4~+抑制水稻幼苗K~+的吸收速率,但并不完全抑制K~+的吸收。K~+对NH_4~+的吸收速率没有影响。NH_4~+抑制K~+的吸收有竞争的性质。NH_4~+抑制K~+吸收的这种方式很可能是一种变构调节。
NH_4 ~ + absorption rate of three-line hybrid rice seedlings, Shanyou 6> Shanyou 3> Nanyou 3> Junyou. In the relationship between parents and offspring, NH_4 ~ + uptake rate of F1 hybrids was between the male parent and the female parent, but preferred to the male parent. The K_m of F_1 was smaller than that of female parent and larger than that of male parent in the kinetic parameters of NH_4 ~ + absorption. The V_max of F_1 was greater than that of female parent and less than that of male parent. The NH 4 + absorption rate of hybrid rice was affected by the genetic inheritance of the male parent. The K ~ + uptake rates of Shanyou 6, Shanyou 3 and Nanyou 3 were similar and both were greater than that of their parents, which showed heterosis. Although the advantage is not very strong, but can accumulate a lot of potassium in life. NH_4 ~ + inhibited the K ~ + uptake rate of rice seedlings, but did not completely inhibit the absorption of K ~ +. K ~ + has no effect on the NH 4 + absorption rate. NH_4 ~ + inhibits the competitive absorption of K ~ +. NH_4 ~ + inhibition of K ~ + absorption of this approach is likely to be an allosteric adjustment.