2020•DOAJ (DOAJ: Directory of Open Access Journals)Requires access
Effects of zinc application on zinc uptake and distribution among different wheat cultivars.
Guangxin Li, Zhao Peng, SUI Fu-qing, Hongen Liu, Wenyuan Gao, Shiyu Qin, Chengcai Li
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Abstract
In order to clarify the effects of exogenous Zn application on the growth and Zn uptake of different wheat cultivars, 10 winter wheat cultivars widely cultivated in Henan Province were selected. Pot experiments were conducted with four Zn levels, namely 0 mg·kg-1 (Zn0), 10 mg·kg-1(Zn10), 20 mg·kg-1(Zn20), and 30 mg·kg-1(Zn30). The effects of different Zn application rates on the growth, development, and Zn uptake and utilization of winter wheat were studied. The results showed that the application of Zn fertilizer on calcareous soil in northern China could significantly increase the wheat grain Zn concentration, but the yield components, dry matter, and Zn efficiency varied within cultivars upon Zn fertilization. The Zn concentration and accumulation in whole wheat plants increased upon Zn application and the increase rate was maximized at Zn20 level, which were 41.4%~85.1% and 19.9%~110.1% higher than those of the control, respectively. The grain Zn concentration of ZhengMai379, BaiNong207, ZhengMai0856, and ZhouMai22 increased as the Zn treatment increased and was maximized at Zn30, with concentrations 43.5%, 65.1%, 68.2%, and 55.8% higher than that of the control, respectively. The grain Zn concentration of ZhengMai366 and ZhouMai27 did not show a an obvious difference under the Zn supply of 10~30 mg·kg-1, which was 40.6%~62.3% higher than that of Zn0. The grain Zn concentration in the other wheat cultivars was maximized at Zn20, and ranged from 55.7% to 92.2% higher than that of the control. The Zn distribution ratio in different wheat organs varied significantly after Zn application, the proportion of Zn in the grains, glumes, stems, and roots was 17.4%~49.9%, 6.3%~16.0%, 21.5%~46.1%, and 12.9%~28.7%, respectively. Overall, ZhengMai379 and AiKang58 could be used as high-efficiency Zn cultivars, and Zn fertilization of 10~20 mg·kg-1 could effectively increase the wheat grain Zn concentration and improve the Zn nutritional quality.