Comprehensive evaluation on Isatis indigotica quality under regulated deficit drip-irrigation
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DOI:10.7606/j.issn.1000-7601.2019.04.09
Key Words: regulated deficit irrigation  quality  principal component analysis method  Isatis indigotica
Author NameAffiliation
WANG Yu-cai College of WaterResources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070 
LI Fu-qiang College of WaterResources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070 
DENG Hao-liang College of WaterResources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070 
ZHANG Heng-jia College of WaterResources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070 
KANG Yan-xia College of WaterResources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070 
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Abstract:
      The effects of irrigation schedule on photosynthetic characteristics and biological characteristics effect during different growth stages of Isatis indigotica were studied in Yimin Irrigation District of Gansu Province in 2016 and 2017. We measured quality of Isatis indigotica for mild, moderate, and severe regulated deficit irrigation in vegetative stages and fleshy root growth stage. The results showed that severe regulated deficit irrigation (WD3, WD8, and WD9) significantly lowered (R, S)-goitrin by 8.59%~13.23% than that of CK (P<0.05). In addition, the content of (R,S)-goitrin was significantly increased in fleshy root growth stage and vegetative stage by water deficit (WD4 and WD5) by 5.43%~7.94%. The effect of light and moderate water deficit treatment (WD5, WD6, and WD7) on indirubin was beneficial to the improvement of indirubin content over that of CK with the increase of 1.7%~5.7%. The light and moderate water deficit treatments (WD4, WD5, WD6, and WD7) significantly increased indigo content by 3.6%~9.9% over CK. The results showed that mild and moderate deficit irrigation (WD4 and WD5) had high comprehensive effects. Therefore, mild-to-moderate water deficit treatments improved the quality of Isatis indigotica by improving the effective components, the indigo, indirubin, and (R, S)-goitrin but severe water deficit was not conducive to the accumulation of active ingredients of Isatis indigotica.
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