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

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．