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Acta Agron Sin ›› 2017, Vol. 43 ›› Issue (08): 1234-1244.doi: 10.3724/SP.J.1006.2017.01234

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Correlation between Hardness and Dry-matter Content of Storage Root in Sweetpotato[Ipomoea batatas (L.)Lam.]

TANG Dao-Bin1,2,AN Jian-Gang2,DING Yi2,BAI Hui2,ZHANG Kai2, LYU Chang-Wen2,FUTi-Hua1,*,WANG Ji-Chun2,*   

  1. 1College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China;2College of Agronomy and Biotechnology, Southwest University/Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University/Sweetpotato Engineering and Technology Research Center, Chongqing, 400716,China
  • Received:2016-11-18 Revised:2017-04-18 Online:2017-08-12 Published:2017-05-11
  • Contact: Fu tihua, E-mail: futihua@sina.com; Wang jichen, E-mail: wchun1963@163.com E-mail:tdbin741023@163.com
  • Supported by:

    This study was supported by the Technology Innovation Fund of Chongqing(cstc2015shms-ztzx80001, cstc2015shms-ztzx80002, stc2015shms-ztzx80003, cstc2015shms-ztzx80004).

Abstract:

To explore the correlation and to discuss the classification standard of hardness and dry-matter contentof sweetpotato, collectedand determined 129 sweetpotato varieties (lines) by using sclerometer and drying method, respectively, and the linear regression equation was established based on the correlation between hardness and dry-matter content values. The dry-matter content and hardness of storage root in the 129 sweetpotato varieties (lines) could be divided into five grades with normal distribution, which proportions were 10.00%, 19.12%, 40.88%, 20.88%, and 9.12%, respectively. There were significant differences in hardness among different parts of storage root,ranking as: the core site of radial cuttingsurface>the middle site of radial cutting surface >the tail site of axial cutting surface>the head site of axial cutting surface>the core site of axial cutting surface >the middle site of axial cutting surface. There was significant positive correlation between hardness and dry-matter content of storage root. By using the mean value of hardness at core and middle parts of storage root after radial cutting, the dry matter content could be well predicted by using the regression equation y=0.6743x+3.6184 (20≤x≤60,R2=0.712192).This equation was validated in evaluation of the dry matter content in 20 sweet potato varieties (lines), and the relative error between estimated value and measured value was 0.2%. This result demonstrated that the equation obtained in this study could be used for accurate, fast and low cost measurement of dry matter content insweetpotato production and breeding.

Key words: 甘薯, 硬度, 干物质含量, 相关性, 回归方程, 概率分级

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