Journal of Stress Physiology & Biochemistry, Vol. 7, No. 2,
2011, pp. 99- 116. ISSN 1997-0838
Original Text Copyright (cc) 2011 by Farouk, Mosa, Taha, Ibrahim,
EL-Gahmery
ORIGINAL
ARTICLE
Data source : Google Scholar
QueryDate : 2016-12-24
Cites : 46
Protective Effect of Humic acid and Chitosan on
Radish (Raphanus sativus, L. var. sativus) Plants Subjected to Cadmium
Stress
Farouk S.1*, A.A. Mosa2,
A. A. Taha2, Heba M. Ibrahim1, A.M. EL-Gahmery2 1Agric. Botany
Department, Faulty of Agriculture, Mansoura University, Mansoura, Egypt 2Soil Science
Department, Faulty of Agriculture, Mansoura University, Mansoura, Egypt
* Phone: 02/0101105095 Email:gadalla@mans.edu.eggadalla.saad@gmail.com
Received April 12, 2011
Background
Humic acid or chitosan has been shown to increase plant growth, yield
and improving physiological processes in plant, but its roles on
alleviating the harmful effect of cadmium on plant growth and
some physiological processes in plants is very rare. Pot
experiments were conducted to study the role of 100 and 200 mg/kg dry
soil from either humic acid or chitosan on counteracted the harmful
effects of cadmium levels (100 and 150 mg/kg dry soil) on radish plant
growth and some physiological characters Results
Cadmium at 100 and 150 mg kg-1 soil decreased significantly
length, fresh and dry weights of shoot and root systems as well
as leaf number per plant in both seasons. Chlorophyll, total sugars,
nitrogen, phosphorus, potassium, relative water content, water
deficit percentage and soluble proteins as well as total amino
acids contents were also decreased. Meanwhile, cadmium concentration in
plants was increased. On the other hand, application of chitosan or
humic acid as soil addition at the concentration of 100 or 200 mg
kg-1 increased all the above mentioned parameters and
decreased cadmium concentrations in plant tissues. Chitosan at 200 mg kg-1
was the most effective than humic acid at both concentrations in
counteracting the harmful effect of cadmium stress on radish
plant growth. Conclusion
In conclusion, both natural chelators, in particular, chitosan at 200
mg/kg dry soil can increase the capacity of radish plant to
survive under cadmium stress due to chelating the Cd in the soil, and
then reduced Cd bio-availability.
