Differences in zinc uptake and use efficiency between different aerobic rice accessions

In order to study the differences in zinc uptake and use efficiency among different aerobic rice varieties(accessions) at early stage,and to understand the mechanism of their adaptability to low zinc condition,twelve aerobic rice varieties(accessions) were studied in the greenhouse under low zinc and sufficient zinc conditions.Rice plants harvested 35 days after sowing and zinc mass fraction was analyzed.The results indicated that there were significant differences among different rice varieties(accessions) in zinc uptake,partition to the shoot and use efficiency.Zinc supply could enhance zinc uptake and mass fraction in plant by 1-2 times,and increase plant biomass by 20%.Among those 12 varieties(accessions),Yunnan Handao,Qinai-3hun,Liaohan109 and 91BT9-7 were not sensitive to low-zinc condition,having little difference in biomass,while Handdao7 was more sensitive to low zinc condition,with relative biomass of 68%.