Genetic study and molecular breeding for high phosphorus use efficiency in maize

Abstract

Phosphorus is the second most important macronutrient after nitrogen and it has many vital functions in the life of plants. Most soils have a low available P content, which has become a key limiting factor for increasing crop production. Also, low P use efficiency (PUE) of crops in conjunction with excessive application of P fertilizers has resulted in serious environmental problems. Thus, dissecting the genetic architecture of crop PUE, mining related quantitative trait loci (QTL) and using molecular breeding methods to improve high PUE germplasm are of great significance and serve as an efficient approach for the development of sustainable agriculture. In this review, molecular and phenotypic characteristics of maize inbred lines with high PUE, related QTL and genes as well as low-P responses are summarized. Based on this, a breeding strategy applying genomic selection as the core, and integrating the existing genetic information and molecular breeding techniques is proposed for breeding high PUE maize inbred lines and hybrids.

Keywords

maize / phosphorus use efficiency / quantitative trait loci / genetic study / molecular breeding / genomic selection

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Acknowledgements

We thank Thea Mi Weiß and Dr. Kesheng Wang for their substantial contribution to the revision of this review. This project was supported by the National Key Research and Development Program of China (2018YFD0100201 and 2016YFD0101201), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China, and the Sino-German International Research Training Group “Adaptation of maize-based food-feed-energy systems to limited phosphate resources.”

Compliance with ethics guidelines

ƒDongdong Li, Meng Wang, Xianyan Kuang, and Wenxin Liu declare that they have no conflicts of interest or financial conflicts to disclose.ƒThis article is a review and does not contain any studies with human or animal subjects performed by any of the authors.

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The Author(s) 2019. Published by Higher Education Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0)