调亏滴灌下菘蓝的品质综合评价

于2016、2017年在张掖市民乐县益民灌溉试验站开展了菘蓝不同生育期水分亏缺试验，在菘蓝的营养生长期和肉质根生长期分别进行轻度、中度和重度的调亏灌溉处理，对其品质进行评价。结果表明：重度调亏灌溉（WD3、WD8、WD9）处理的(R,S)-告依春含量较CK降低8.59%~13.23%（P<0.05），而在营养生长期和肉质根生长期轻中度连续调亏（WD4、WD5）有利于 (R,S)-告依春含量的提高，较CK增加5.43%~7.94%；在营养生长期和肉质根生长期轻中度连续调亏（WD5、WD6、WD7）有利于靛玉红含量的提高，与CK差异显著，增幅为1.7%~5.7%；在营养生长期和肉质根生长期轻中度连续调亏（WD4、WD5、WD6和WD7）有利于靛蓝含量的提高，与CK差异显著，增幅3.6%~9.9%。综合评价表明，综合得分较高的为轻中度连续调亏滴灌（WD4、WD5）。因此，轻中度水分亏缺处理可以提高有效成分靛蓝、靛玉红和告依春的积累，有利于提高菘蓝的品质，重度水分亏缺不利于有效成分的积累。

Comprehensive evaluation on Isatis indigotica quality under regulated deficit drip-irrigation

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.