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Acta Agron Sin ›› 2018, Vol. 44 ›› Issue (01): 126-136.


Effects of Drought Stress at Different Growth Stages on Endogenous Hormones and Its Relationship with Storage Root Yield in Sweetpotato

ZHANG Hai-Yan1,2,DUAN Wen-Xue2,XIE Bei-Tao2,DONG Shun-Xu2,WANG Bao-Qing2,SHI Chun-Yu1,*,ZHANG Li-Ming3,*   

  1. 1 Agronomy College, Shandong Agricultural University, Tai’an 271018, Shandong, China; 2 Crop Research Institute of Shandong Academy of Agricultural Sciences, Jinan 250100, Shandong, China; 3 Shandong Academy of Agricultural Sciences, Jinan 250100, Shandong, China
  • Received:2017-04-23 Revised:2017-09-10 Online:2018-01-12 Published:2017-10-27
  • Contact: Shi Chunyu,E-mail: scyu@sdau.edu.cn; Zheng Liming,E-mail: zhanglm11@sina.com E-mail:zhang_haiyan02@163.com
  • Supported by:

    This study was supported by the China Agriculture Research System (CARS-10- B08), Shandong Province Modern Agricultural Technology System Tubers and Root Crops Innovation Team (SDAIT-16-09), Shandong Province Key Research and Development Project(2016GNC111002), and Scientific Observing and Experimental Station of Tubers and Root Crops in Huang-Huai-Hai Region, Ministry of Agriculture, P. R. China.


Field experiments were conducted under a rain exclusion shelter using two sweetpotato (Ipomoea batatas (L.) Lam) cultivars (Jishu 21, drought-tolerant, and Jizishu 1, drought-sensitive) with four drought stress treatments during the whole growth period (DS), root branching stage (DS1), the intermediate stage (storage root initiation) (DS2), and the final stage (storage root bulking) (DS3). A sep-arate well watered experiment was as a control (WW). Compared with the control, the fresh and dry weight of two cultivars in all treatments decreased significantly in three years. The dry weight of DS treatment had the highest decrease, with an average of 44.62% and 56.21% for Jishu 21 and Jizishu 1, respectively. The impact of DS1 was the second, with an average decrease of 32.03% and 44.03% for Jishu 21 and Jizishu 1, respectively, followed by DS2, with an average decrease of 30.41% and 39.39%, respectively. The impact of DS3 was the lowest, with an average decrease of 13.66% and 17.88%, respectively. The impact of drought stress on dry weight of Jishu 21 was lower than that of Jizishu 1. The drought stress significantly inhibited the growth of aboveground part, and the formation and bulking of storage roots. Number of leaves per plant, vine length, dry weight of aboveground and underground parts, and starch content were decreased under drought stress, compared with the control. DS had the highest impact, followed by DS1 and DS2; DS3 had the lowest impact. GA, IAA, and ZR contents in leaves and roots of both cultivars decreased, while ABA content increased. There were significant positive correlations between dry weight of aboveground part and GA, IAA, and ZR contents in leaves, dry weight of underground part and GA, IAA, and ZR contents in storage roots. However, ABA content in leaves and storage roots was negatively correlated with dry weight of aboveground part and underground part, respectively. In summary, drought stress applied during different growth stages reduced the yield of fresh and dry roots. The earlier the application of drought stress, the greater influence on levels of endogenous hormones and storage root yields. Root branching stage of sweetpotato is most sensitive to drought stress.

Key words: sweetpotato, drought stress, endogenous hormone, yield

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