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Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (03): 542-549.doi: 10.3724/SP.J.1006.2014.00542


Screening and Evaluation Indicators for Low Potassium-Tolerant and Potassium Efficient Sweetpotato (Ipomoea batatas L.) Varieties (Lines)

TANG Zhong-Hou1,2,*,ZHANG Yun-Gang1,WEI Meng1,CHEN Xiao-Guang1,SHI Xin-Min1,ZHANG Ai-Jun1,LI Hong-Min1,DING Yan-Feng2   

  1. 1 Sweetpotato Research Institute, Chinese Academy of Agricultural Sciences / Xuzhou Sweetpotato Research Center, Jiangsu / Key Laboratory of Sweetpotato Biology and Genetic Breeding, Ministry of Agriculture, Xuzhou 221121, China; 2 College of Agronomy, Nanjing agricultural university, Nanjing 210095, China
  • Received:2013-08-06 Revised:2013-12-14 Online:2014-03-12 Published:2014-01-16
  • Contact: 唐忠厚, E-mail: zhonghoutang@sina.com, Tel: 0516-82028152


Potassium (K) uptake and utilization are closely related to plant growth and storage root formation of sweetpotato. In this paper, 31 good quality sweetpotato varieties (lines), NP plot (treatment of nitrogen and phosphorus) and NPK plot (treatment of nitrogen, phosphorus and potassium) were used to screen low K-tolerant and K efficient sweetpotato varieties (lines) in a long-term fertilization plots. The results showed that there was a significant difference (P<0.05) among storage root yield of sweetpotato varieties (lines). The variation of K sensitivity index (relative root weigh, RRW) was from 0.40 to 0.98, with a significant difference (P<0.05). Varieties (lines) were divided into four types (low sensitive, moderately sensitive, sensitive and highly sensitive) by cluster analysis. There were significant differences of total K accumulation amount (TKAA) and K concentration under two treatments of varieties (lines). Under NPK treatment, K utilization efficiencies (KUE) of root and whole plant were from 58.92 to 384.9 g g–1 and from 42.03 to 165.52 g g–1 with significant difference between these materials (P<0.05), respectively. Correlation analysis showed that there were some correlations of TKAA, K concentration, root yield, KUE, and RRW among varieties (lines). It is a feasible method for screening different fertilization efficiency sweetpotato varieties (lines) through long-term fertilization experiment. KUE and RRW as two major indicators can be used for screening low potassium (K)-tolerant and K efficient sweetpotato materials.

Key words: Sweetpotato varieties (lines), Low potassium-tolerant, Potassium efficient, Screening

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