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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。
In order to explore the differences in iron efficiency of different genotypes of maize seedling, 12 maize inbred lines (Mo17, KUI3, CI7, Sc55, DE3, K22, 8701, Zong3, BY815, Dan340, Zheng58 and B77) Different concentrations of HEDTA-Fe3 + (2μmol / L for low iron and 100μmol / L for low iron) were used to study the plant height, number of leaves, dry weight, ratio of root to shoot, chlorophyll and trace elements analysis. The results showed that: 1) Under low iron stress, plant height, SPAD value, aboveground biomass, root biomass, and total biomass were significantly decreased in all genotypes of maize, with the highest in D340, B77 and CI7; Biomass was significantly lower than other genotypes, with the least decrease in total biomass of DE3. 2) The absorption of zinc, manganese and copper by genotypes in low-iron treatment increased to some extent. The iron absorption efficiency of 12 genotypes ranged from 5% to 40%, of which DE3 had the highest iron absorption efficiency and B77 iron had the lowest efficiency. 3) Under normal iron supply, the total biomass and SPAD value of maize showed extremely significant negative correlation with iron absorption efficiency; while under low iron stress, there was a significant negative correlation between root-shoot ratio and iron absorption efficiency.