小麦株高和茎秆不同部位砷镉磷含量与籽粒砷镉磷含量的关系

以12个小麦品种为供试材料,利用盆栽试验研究了小麦穗下节间长、株高和茎秆不同部位砷、镉、磷含量在不同品种间的差异以及它们与小麦籽粒砷、镉、磷含量之间的关系。结果显示,小麦株高、穗下节间长以及茎秆不同部位砷、镉、磷含量存在明显的品种差异。皮尔森相关性分析结果显示,小麦籽粒砷含量与颖壳和穗轴部位砷含量显著正相关,相关系数分别为0.659(P0.01)和0.433(P0.05)。籽粒镉和磷含量与株高和穗下节间长呈显著负相关,其相关系数:镉分别为-0.264(P0.05)和-0.345(P0.01),磷分别为-0.583(P0.01)和-0.437(P0.01)。籽粒磷含量分别与颖壳、穗轴和节间磷含量呈显著正相关,相关系数分别为0.526(P0.01)、0.430(P0.05)和0.532(P0.01)。籽粒砷和镉含量与颖壳和穗轴中磷含量均存在显著相关性。这些结果表明,颖壳和穗轴部位砷含量大小可以用来表征籽粒砷含量,选育植株较高的小麦品种有利于降低籽粒镉的积累。

Relationship between arsenic, cadmium, and phosphorous concentrations in different parts of wheat straw, wheat plant height and grain arsenic, cadmium, and phosphorous concentrations

The differences in the upper-most internode length and plant height among 12 wheat cultivars and their relationship with grain arsenic(As),cadmium(Cd) and phosphorous(P) concentrations in soil "naturally" contaminated with both As and Cd were investigated by using pot experiments. The differences in As,Cd,and P accumulation in different parts of wheat straw and their relationship with grain As,Cd and P concentrations in 6 wheat cultivars were also investigated. The results showed that the plant height and upper-most internode length were significant differences among the 12 wheat cultivars. As,Cd,and P concentrations in wheat straw were significant differences among different cultivars and different parts of wheat straw.Grain As concentration was positively correlated with husk and rachis As concentrations,the correlation coefficients were 0.659(P<0.01) and 0.433(P<0.05),respectively. Grain Cd and P concentrations were negatively correlated with plant height and upper-most internode length,the correlation coefficients were -0.264(P<0.05) and -0.345(P<0.01) for Cd,-0.583(P<0.01) and -0.437(P<0.01) for P,respectively. Grain P concentration was positively correlated with husk,rachis and internode P concentrations. Both As and Cd concentrations in wheat grain were significantly correlated to P concentration in wheat husk and rachis. These results indicated that plant height may be a potential selection criterion for breeding low Cd wheat cultivar. Arsenic concentrations in wheat husk and rachis can be used as indexes of As level in the grain.