The toxic effects of different concentrations of Cr3+ and Cr6+ on the physiological and biochemical characteristics of tea plant were studied in Hoagland solution culture. The results indicated that: with the increasing of Cr3+, Cr6+ concentrations, the symptoms of tea plant became obviously; the contents of chlorophyll and the ratio of chlorophyll a and chlorophyll b reduced obviously, and there were obviously negative effects to net photosynthesis rate, intercellular CO2 concentration, transpiration rate and stoma conductivity. Under the Cr3+ stress, the activities of SOD, POD and CAT increased at first and then decreased, under the Cr6+ stress, the activities of SOD and POD increased at first and then decreased too, but the activity of CAT decreased all the time. At the same time, the contents of MDA and proline (Pro), cytomembrane permeability increased obviously with the increasing of Cr3+, Cr6+ concentrations. Therefore, it highlighted that the Cr3+ and Cr6+ stresses could mangle the cytomembrane system, the structures and functions of the major organelles of tea plant, and the toxic effects of Cr6+ on tea plant was stronger than that of Cr3+.
TANG Qian
,
FENG De-jian
,
YANG Hua
,
WU Yong-sheng
,
TAN He-ping
. Toxic Effects of Cr3+, Cr6+ on the Physiological and Biochemical Characteristics of Tea Plant[J]. Journal of Tea Science, 2009
, 29(4)
: 301
-308
.
DOI: 10.13305/j.cnki.jts.2009.4.009
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