Reactions of Lettuce Root Exudation to Cadmium Stress
《北方园艺》[ISSN:1001-0009/CN:23-1247/S]
- Issue:
- 2018年19
- Page:
- 16-22
- Research Field:
- Publishing date:
Info
- Title:
- Reactions of Lettuce Root Exudation to Cadmium Stress
- Author(s):
- TANG Xiwang1; TONG Yan′an2; HE Xin1
- (1.Department of Environmental Science,Hebei University of Environmental Engineering,Qinhuangdao,Hebei 066102;2.College of Natural Resources and Environment,Northwest A & F University,Yangling,Shaanxi 712100)
- Keywords:
- cadmium; lettuce; root secretion; soil cadmium availability
- PACS:
- -
- DOI:
- 10.11937/bfyy.20180755
- Abstract:
- In this study four lettuce varieties (‘American fast growing lettuce’ ‘Daxiangsheng No.2’‘Fashi Cai Huaye Kuju’ and ‘Lisheng No.2’) were cultivated in 10 mg·L-1 Cd contained Hoagland solution for three weeks to real the reactions of root exudation under cadmium stress.The water culture method was used to obtain the root secretion solution at the end of every week.The TOC content (mg·L-1·h-1) of the root secretion solution was used to characterize lettuce roots secretion capacity,the 3-D fluorescence spectrum scan results of the root secretion solution was used to characterize types of lettuce roots secretion,the soil extracted cadmium concentration by the root secretion solution was used to characterize the capacity of lettuce roots secretion to activate soil cadmium.The results showed that the roots secretion capacity was increased by incubation time,while the number of root secretion and cadmium activation capacity of root secretion showed a trend of decrease.The root secretion capacity was both significant negative related to the root secretion activate ability to soil cadmium (r=-0.59，P<0.01),and types of root secretion (r=-0.78，P<0.01),while the root secretion activate ability to soil cadmium was significant positive related to the types of root secretion (r=0.69，P<0.01).That meant while under cadmium stress,the lettuce roots secretion capacity would increase while the types of root secretion would decrease,that would result in the reducing of Cd activation ability of the lettuce root secretion.
Last Update: 2018-11-06