Crops ›› 2016, Vol. 32 ›› Issue (3): 84-88.doi: 10.16035/j.issn.1001-7283.2016.03.016

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Comparison of Resistant Physiological Index among Four Species in the Genus Panax under Water Stress

Zuo Yingmei,Yang Weize,Yang Tianmei,Yang Meiquan,Xu Zongliang,Yang Shaobing,Zhang Jinyu   

  1. Institute of Medicinal Plant,Yunnan Academy of Agricultural Sciences,Kunming 650200,Yunnan,China
  • Received:2016-01-26 Revised:2016-03-20 Online:2016-06-15 Published:2018-08-26
  • Contact: Jinyu Zhang

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Abstract:

To understand the physiological mechanism of drought resistance objectively,and provide the references for regional planting and cultivation managements in the Genus Panax, potted nature water consumption experiments were conducted by using Panax notoginseng, Panax stipuleanatus, Panax japonicus var. major and Panax vietnamensis as materials. We measured the content of chlorophyll and the activity of superoxide dismutase (SOD), peroxidase (POD) and the content of malondialdehyde (MDA) under four soil moisture levels,and preliminarily evaluated the drought adaptability of these materials.The results showed that the leaf chlorophyll content increased among four species under drought stress,and was higher than the control group.The chlorophyll synthesis was not been suppressed under drought stress, which was taken as a physiological strategy to adaption under drought stress.SOD activity was significantly increased in all four species compared to the control,and SOD activity in P. japonicus var. major and P.vietnamensis was increased greatly.Under severe drought conditions (RWC45%-55%),POD activity was increased in P. japonicus var. major with a increasing rate of 21.16%, and that of other species was decreased. POD activity in P.vietnamensis was less decreased. MDA content in P. japonicus var. major and P.vietnamensis was decreased compared to the control,but their changing scale was small.After the analysis, it could be seen that P. japonicus var. major and P.vietnamensis had higher drought resistant capability in all four species.Under drought stress, the activity of SOD and POD was increased or minor decreased,and MDA content was relatively stable. According to these indexes contributing much to drought resistance,they could be considered as indexes of drought resistance.

Key words: Genus Panax germplasm resources, Drought stress, Physiological indexes

Fig.1

The changes of chlorophyll content among four species in the Genus Panax under different water conditions Different small letters show significant difference at 5% level, the same below"

Fig.2

The changes of SOD activity among four species in the Genus Panax under different water conditions"

Fig.3

The changes of POD activity among four species in the Genus Panax under different water conditions"

Fig.4

The changes of MDA content among four species in the Genus Panax under different water conditions"

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