[Effect of water stress on growth and accumulation of active components of Isatis indigotica].
OBJECTIVE
To study the effect of water stress on the growth and accumulation of active components of Isatis indigotica.


METHODS
By pot culture experiment,the characteristic indexes of water requirement, chlorophyll content, transpiration rate, photosynthesis, biomass and effective ingredient indirubin were studied under normal and water stress conditions, respectively.


RESULTS
With the increase of the extent and duration of water stress, the quantity of water requirement, chlorophyll content, respiration rate, photosynthesis and biomass of I. indigotica were decreased, while water use efficiency increased.


CONCLUSIONS
It is a critical period of water requirement in July, high water content in soil and extreme water stress are not propitious to the accumulation of indirubin, appropriate water stress can stimulate indirubin accumulatio. The harvest of leaves of I. indigotica is optimal in July, while the harvest of root is appropriate in October. Yield and quantity of I. indigotica are improved when the field capacity is between 45% and 70%.
Tan
Yong
Y
School of Pharmaceutical Sciences, Shihezi University, Shihezi 832002, China. xjtany@yahoo.com.cn
Liang
Zong-Suo
ZS
Dong
Juan-E
JE
Hao
Hai-Yuan
HY
Ye
Qing
Q
D018533:Biomass; D019069:Cell Respiration / Q000502:physiology; D002734:Chlorophyll / Q000378:metabolism; D003681:Dehydration; D007211:Indoles / Q000378:metabolism; D031219:Isatis / Q000254:growth & development* / Q000378:metabolism*; D010788:Photosynthesis / Q000502:physiology; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D010946:Plants, Medicinal / Q000254:growth & development / Q000378:metabolism
D007211:Indoles; D002734:Chlorophyll; C027185:indirubin