Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (9): 1934-1942.DOI: 10.1016/S2095-3119(14)60839-X

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Differences in the Efficiency of Potassium (K) Uptake and Use in Five Apple Rootstock Genotypes

 CHANG Cong, LI Chao, LI Cui-ying, KANG Xiao-yu, ZOU Yang-jun , MA Feng-wang   

  1. State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F University, Yangling 712100, P.R.China
  • 收稿日期:2013-09-13 出版日期:2014-09-22 发布日期:2014-09-24
  • 通讯作者: ZOU Yang-jun, Tel/Fax: +86-29-87082613, E-mail: yangjunzou@126.com
  • 作者简介:CHANG Cong, E-mail: changcong89@126.com
  • 基金资助:

    This work was supported by the National High Technology Research and Development Program of China (863 Program, 2011AA100201), and the Earmarked Fund for the China Agriculture Research System (CARS-28).

Differences in the Efficiency of Potassium (K) Uptake and Use in Five Apple Rootstock Genotypes

 CHANG Cong, LI Chao, LI Cui-ying, KANG Xiao-yu, ZOU Yang-jun , MA Feng-wang   

  1. State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F University, Yangling 712100, P.R.China
  • Received:2013-09-13 Online:2014-09-22 Published:2014-09-24
  • Contact: ZOU Yang-jun, Tel/Fax: +86-29-87082613, E-mail: yangjunzou@126.com
  • About author:CHANG Cong, E-mail: changcong89@126.com
  • Supported by:

    This work was supported by the National High Technology Research and Development Program of China (863 Program, 2011AA100201), and the Earmarked Fund for the China Agriculture Research System (CARS-28).

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摘要： Plants that grow well while accumulating and transporting less potassium (K) perform better than more-sensitive plants when under deficiency conditions, which makes low-K-input and environmentally friendly agriculture possible. We conducted hydroponics and sand culture experiments to evaluate the efficiency of various apple (Malus domestica Borkh) rootstocks in their K uptake and utilization. Five genotypes were selected which are widely used in China -M. hupehensis Rehd, M. prunifolia Borkh, M. robusta Rehd, M. sieversii Roem, and M. rockii Rehd. Plant heights, root and shoot dry weights, and K concentrations were recorded. These genotypes differed markedly in dry weights, absolute and relative K concentrations, absolute and relative K accumulations, and their K efficiency ratio under deficient K conditions. The last parameter, expressed as relative shoot dry weight, was strongly and positively correlated with the other four parameters in each genotype. Therefore, we suggest that this parameter could serve as an index when selecting K-efficient genotypes. In this study, we have determined that M. sieversii and M. rockii are K-inefficient genotypes; M. prunifolia is K-efficient genotype; M. hupehensis and M. robusta have moderate levels of potassium efficiency.

关键词: apple rootstock genotypes , potassium efficiency , genotype difference , potassium uptake , potassium utilization

Abstract: Plants that grow well while accumulating and transporting less potassium (K) perform better than more-sensitive plants when under deficiency conditions, which makes low-K-input and environmentally friendly agriculture possible. We conducted hydroponics and sand culture experiments to evaluate the efficiency of various apple (Malus domestica Borkh) rootstocks in their K uptake and utilization. Five genotypes were selected which are widely used in China -M. hupehensis Rehd, M. prunifolia Borkh, M. robusta Rehd, M. sieversii Roem, and M. rockii Rehd. Plant heights, root and shoot dry weights, and K concentrations were recorded. These genotypes differed markedly in dry weights, absolute and relative K concentrations, absolute and relative K accumulations, and their K efficiency ratio under deficient K conditions. The last parameter, expressed as relative shoot dry weight, was strongly and positively correlated with the other four parameters in each genotype. Therefore, we suggest that this parameter could serve as an index when selecting K-efficient genotypes. In this study, we have determined that M. sieversii and M. rockii are K-inefficient genotypes; M. prunifolia is K-efficient genotype; M. hupehensis and M. robusta have moderate levels of potassium efficiency.

Key words: apple rootstock genotypes , potassium efficiency , genotype difference , potassium uptake , potassium utilization