锌对不同基因型玉米缺锌后的恢复效果及胚乳在缺锌中的作用

Effects of different zinc concentrations on maize restoration after zinc deficiency and the function of endosperm in zinc deficiency

  • 摘要: 用溶液培养法研究不同Zn浓度对玉米缺Zn后恢复效果及胚乳在缺Zn中作用结果表明,不同基因型玉米缺Zn后恢复所需的适宜Zn浓度不同,敏感品种比非敏感品种要求更高的Zn浓度。缺zn后恢复所需适宜zn浓度高于正常培养所需适宜zn浓度,低浓度Zn(O.1umol/L)无恢复作用(生物量)。带上胚乳使敏感品种在缺Zn、低Zn下受抑程度(缺Zn与供Zn生物量差值)提高,而非敏感品种受抑程度反而减小。缺Zn与低Zn培养时体内P含量提高,胚乳可缓解这种影响。缺Zn后再供Zn可使体内Zn含量提高,而P含量降低,玉米对Zn产生奢侈吸收,使体内Zn含量超过正常供Zn水平,表明缺Zn后植物对Zn的要求提高。0.1umol/L Zn恢复对“吉单120”玉米Zn含量无明显影响,但“辽单22”玉米Zn含量显著提高,这表明非敏感品种比敏感品种利用低Zn的能力更强。

     

    Abstract: In this paper,the effects of different Zn concentrations on maize restoration after Zn deficiency and the function of endosperm in Zn deficiency were studied with solution culture experiments.The results show that the restorations of maize in different genotypes after Zn deficiency need different Zn concentrations.Higher Zn concentration is required for the restoration in sensitive genotypes than in insensitive genotypes;the suitable Zn concentration for restoration is higher than that of normal culture,thus the supply of low Zn(at a concentration of 0.1umol/L)has no restoration function:cu1ture without the removal of endosperm enhances the growth inhibition of sensitive genotypes in both the deficiency and the low concentration of Zn,while reduces the growth inhibition of insensitive genotypes;P content is elevated in both Zn deficiency and low concentration of Zn,and endosperm can relieve this effects.When supply of Zn is restored after Zn deftciency,Zn content in plants is elevated,hut P content is deduced,and maize plants luxuriously absorb Zn when Zn is supplied after Zn deficiency,it sugges ts that a higher Zn concentration is required after Zn deficiency in plants. When Zn supply is restored at a concentration of 0.1/umol/L,Zn content in“Jidan 120”has no obvious change.but is elevated in“Liaodan 22”,it suggests that the insensitive genotypes have a stronger ability to use low concentration of Zn.

     

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