Chinese Journal OF Rice Science >
Effect of Foliar Application of Different Zn Compounds on Zn Concentration and Bioavailability in Brown Rice
*Corresponding author：E-mail:yxwang@yzu.edu.cn
Received date: 2015-07-25
Revised date: 2015-09-26
Online published: 2015-11-10
Zinc (Zn) biofortification through foliar Zn application is an attractive strategy to reduce Zn deficiency. Four Zn compounds were applied through foliar spray to three rice varieties at flowering and one week after flowering under field conditions. The concentrations of Zn and phytic acid in brown rice were measured. The results showed that Zn concentration in grains from different parts of a panicle varied significantly, with Zn concentration of grains from upper part of a panicle being higher than that of middle or lower parts. In contrast, phytic acid or the molar ratio of phytic acid to Zn showed the opposite trend. Compared with CK (water spray), foliar application of ZnSO4, Zn-citrate, Zn-gluconate and Zn-EDTA increased Zn concentration by 33%, 31%, 26% and 27%, respectively. The grains at upper or middle parts of a panicle were affected much more than that at lower part. Nipponbare was more sensitive to Zn application than other varieties. Zinc treatment had little effect on the concentration of phytic acid. Averaged across all varieties, the molar ratio of phytic acid to Zn in brown rice was reduced by 25%, 24%, 22% and 18% through foliar application of ZnSO4, Zn-Citrate, Zn-Gluconate and Zn-EDTA, respectively. The reduction was greater in the grains from upper or middle parts than lower part of a panicle. The reduction in Nipponbare or L71 was greater than that in L81. Significant Zn×variety interaction and Zn×variety ×position interaction were detected. In conclusion, foliar Zn application at early grain growing stage significantly increased Zn concentration and bioavailability, and the increment varied with Zn compound, genotype and grain position, with superior spikelets being more susceptible.
Key words： rice; Zn forms; Zn concentration; phytic acid; Zn bioavailability
Qing ZHANG, Juan WANG, Li-quan JING, Lian-xin YANG, Yun-xia WANG . Effect of Foliar Application of Different Zn Compounds on Zn Concentration and Bioavailability in Brown Rice[J]. Chinese Journal OF Rice Science, 2015 , 29(6) : 610 -618 . DOI: 10.3969/j.issn.1001G7216.2015.06.007
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