Effects of genotype and growing location on iron and zinc contents in sweetpotato (Ipomoea batatas L.)
J. Chen A , G. Lu B C and G. Wang BA Department of Food Science and Nutrition, Zhejiang University, Huajiachi Campus, 268 Kaixuan Road, Hangzhou 310029, China.
B Institute of Crop Science & Technology, Zhejiang University, Huajiachi Campus, 268 Kaixuan Road, Hangzhou 310029, China.
C Corresponding author. Email: lugq10@zju.edu.cn
Crop and Pasture Science 60(7) 684-690 https://doi.org/10.1071/CP08291
Submitted: 29 August 2008 Accepted: 20 March 2009 Published: 14 July 2009
Abstract
Sweetpotato (Ipomoea batatas L.) has great potential for combating micronutrient malnutrition and vitamin A deficiency. To explore the potential of combining different micronutrients in the same cultivar through genetic improvement, we assessed the variation of Fe and Zn contents among 21 genotypes and 5 growing locations in the eastern region of China. Large genotype-dependent differences for Fe and Zn were found in the storage roots. The Fe content ranged from 2.68 to 4.64 mg/100 g dry weight basis (dwb), whereas the Zn content ranged from 2.92 to 6.95 mg/100 g dwb. The variation caused by genotypes, locations, and genotype × environmental interaction was highly significant for both Fe and Zn. No significant correlation was found between β-carotene and Fe and Zn contents in the storage roots. The results show that sweetpotato as a staple or co-staple food may provide a good proportion of bioavailable Fe and Zn for the nutritional requirements of human populations. It appears feasible to increase Fe and Zn in orange-fleshed storage roots through breeding of new varieties.
Additional keywords: Fe, Zn, carotene, vitamin A deficiency, micronutrient malnutrition, genotype(G) × environmental (E) interaction.
Acknowledgments
We thank Lambert Motilal for his critical review of this manuscript. This work was supported by the National Natural Science Foundation of China (30871567), National Scientific and Technical Programs (2006BAD01A06; 2006BAD05A11-6; nyhyzx07-012-12), the key project of the Science & Technology Department of Zhejiang Province, and the 985 project of the Ministry of Education, China.
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