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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (01): 131-140.doi: 10.3724/SP.J.1006.2016.00131


Comparison of Root Characteristics and Sugar Components in Root and Leaf at Early Growth Phase of Sweet Potato Varieties with Significant Difference in Valid Storage Root Number

WANG Cui-Juan1,SHI Chun-Yu1,*,LIU Na2,LIU Shuang-Rong1,YU Xin-Di1   

  1. 1 College of Agronomic Sciences, Shandong Agricultural University / State Key Laboratory of Crop Biology, Tai’an 271018, China; 2 Resources of Horticulture Science and Engineering, Shandong Agricultural University / State Key Laboratory of Crop Biology, Tai’an 271018, China
  • Received:2015-04-20 Revised:2015-09-06 Online:2016-01-12 Published:2015-10-08
  • Contact: 史春余, E-mail: scyu@sdau.edu.cn, Tel: 0538-8246259 E-mail:cuijuanwangwang@126.com
  • Supported by:

    This research was supported by the National Natural Science Foundation of China (31371577) and the Potato Innovation Program for Chief Expert of Shandong Province (SDAIT-10-011-01).


Starch sweet potato varieties Shangshu 19 and Jixu 23 differing in valid storage root number per plant significantly were used to investigate root characteristics, sugar components in root and leaf at early growth phase and their relationship with the formation of storage root per plant at top cover stage. The results showed that, Shangshu19 with higher valid storage root number regrew quickly with more new roots after seedling transplanting, developed fiberous roots mainly in the whole early growth phase, and formed a stable rate of top biomass/total root system biomass (T/TR) at 15 and 30 days after planting. Jixu 23 achieved the steady number of adventitious root and valid storage root at 15 and 30 days after planting, respectively. Meanwhile, Jixu 23 showed the lower rate of top biomass/storage root biomass (T/SR) at top cover stage (45 days after planting). On the other hand, in point of metabolism of sucrose and hexoses, and the formation of stored polysaccharide polymers, Shangshu19 had significantly lower rate of sucrose/hexoses in the whole early growth phase, formed the greater sucrose concentration gradient between leaves and roots, and had 1-Kestose and Nystose in roots at 15 and 30 days after planting. Its starch content in leaf was significantly lower than that of Jixu 23 at 30 and 45 days after planting. Meanwhile, Jixu 23 only had Nystose in roots before storage root formation, with significantly lowest rate of sucrose/starch when the rate of sucrose/total soluble sugar was similar to that of Shangshu 19 at 45 days after planting. A two-year field trials (2013–2014) were performed to investigate yield-contributing traits and the fresh storage root yield at top cover stage and harvest period, in which, Shangshu19 showed the more valid storage roots per plant, higher valid storage root fresh weight per plant or storage root at top cover stage and harvest period, meanwhile, Jixu23 had significantly higher average fresh weight per storage root.

Key words: Sweet potato, Valid storage root per plant, Root characteristics, Sugar components, Storage root yield

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