不同玉米自交系苗期铁效率差异研究

为探究不同基因型玉米苗期铁效率的差异,以12个玉米自交系(Mo17、KUI3、CI7、Sc55、DE3、K22、8701、Zong3、BY815、Dan340、Zheng58和B77)为供试材料,用不同浓度的HEDTA-Fe3+(低铁为2μmol/L,对照为100μmol/L)处理;通过对苗期玉米植株株高、叶片数、干重、根冠比、叶绿素和微量元素等指标进行研究分析。结果表明:1)低铁胁迫下,各基因型玉米的株高、SPAD值、地上部生物量、根部生物量、以及总生物量均显著降低,D340、B77和CI7株高下降最多;B77总生物量显著低于其他基因型,DE3总生物量下降最少。2)低铁处理下各基因型对锌、锰和铜的吸收都有不同程度地提高。12个基因型的铁吸收效率变异范围为5%~40%,其中DE3铁吸收效率最高,而B77铁效率最低。3)正常供铁情况下,玉米的总生物量、SPAD值均与铁吸收效率呈现极显著的负相关;而在低铁胁迫下,根冠比与铁吸收效率呈显著的负相关。     

A copper‐phosphorus interaction in wheat 1

Abstract

Examination of results from two experiments designed to compare copper (Cu) carriers, rates, and application methods and an experiment designed to test the residual effects of Cu on spring wheat (Triticum aestivum L.) pointed to the existence of an interaction between Cu and phosphorus (P). Mineral element data for aboveground whole‐plant samples from the three experiments indicated that, with low Cu levels in the soil, when Cu was applied as CUSO₄ in an apparently unavailable position, or when the Cu had been applied to the soil as CuHEDTA, P concentrations in the plant were very high. Also, when CUSO₄ was applied to the soil and incorporated to a depth of 60 to 100 mm, concentrations of Cu increased and P decreased in the plant. In each case, if Cu concentrations in the plant were adequate, then normal plant development occurred. A Cu‐P interaction which affected P uptake or translocation was evident.