Abstract
Water and soil pollution by cadmium have caused severe impact to environment, especially the inhibition of plant growth due to the cadmium stress. Taking cucumber seedlings as the materials, the effect of exogenous melatonin on cadmium uptake and photosynthetic capacity of cucumber seedlings under cadmium stress were studied. The results showed that the leaf area and chlorophyll content of cucumber seedling leaves were decreased after cadmium stress, while the decrease in leaf area was alleviated after the addition of exogenous melatonin. And there was less cadmium content in the roots of cucumber seedlings than that of cadmium stress treatment alone. Exogenous melatonin increased net photosynthetic rate (Pn) with the enhancement of stomatal conductance (Gs), transpiration rate (Tr) of cucumber seedlings. Further analysis of the chlorophyll fluorescence parameters revealed that the decrease of the effective quantum yield of photochemical energy conversion in PSII (Y(II)), and the photochemical fluorescence quenching coefficient (qP) by cadmium stress treatment were mitigated by addition of melatonin. The results indicated that exogenous melatonin could significantly alleviate the damage of cadmium stress on photosynthetic organs of cucumber seedlings, improve their photosynthetic capacity and reduce the damage caused by cadmium stress. It could be recommended to apply melatonin cultivation of cucumber under cadmium stress.
Highlights
Cadmium (Cd) pollution in soil is becoming more and more serious due to the exploitation and utilization of mineral resources, the extensive use of chemical products, pesticides and fertilizers, and the wanton discharge of municipal sludge and sewage
Cucumber was taken as the research object, and the effects of exogenous melatonin on cadmium uptake of cucumber seedlings under cadmium stress were determined by measuring the leaf growth and photosynthetic gas parameters of cucumber seedlings
While the leaf area of the seedlings treated with exogenous melatonin (Cd + MT) increased significantly by 59.57% compared with the cadmium stress treatment (Cd)
Summary
Cadmium (Cd) pollution in soil is becoming more and more serious due to the exploitation and utilization of mineral resources, the extensive use of chemical products, pesticides and fertilizers, and the wanton discharge of municipal sludge and sewage. The effects and mechanism of exogenous melatonin on cucumber and other vegetable crops need further research In this experiment, cucumber was taken as the research object, and the effects of exogenous melatonin on cadmium uptake of cucumber seedlings under cadmium stress were determined by measuring the leaf growth and photosynthetic gas parameters of cucumber seedlings. Cucumber was taken as the research object, and the effects of exogenous melatonin on cadmium uptake of cucumber seedlings under cadmium stress were determined by measuring the leaf growth and photosynthetic gas parameters of cucumber seedlings The aim of this experiment was to find way of rapid detection through photosynthetic characteristics, make clear the mechanism of mitigation of exogenous melatonin in cucumber seedlings under cadmium stress, and provide more references for stress-resistant cultivation and safe production of vegetables
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