Impact of cadmium toxicity on leaf area, stomatal frequency, stomatal index and pigment content in mungbean seedlings.
Effect of different concentrations of CdSO4 (10(-4) M, 5 x 10(-4) M and 10(-3) M) on leaf area, stomatal frequency, stomatal index and pigment content in 6 days old mungbean seedlings was studied under laboratory conditions. Except at 10(-4) M CdSO4, leaf area decreased with an increase in the concentration of CdSO4. Stomatal frequency on the leaf surface increased at 5 x 10(-4) M and 10(-3) M CdSO4 in comparison to untreated control. However, reverse was the case for stomatal index. Chlorophyll-a, chlorophyll-b, total chlorophyll, and chlorophyll a/b ratio were increased at 10(-4) M CdSO4, and decreased thereafter with an increase in the concentration of Cd2+. Possible reasons for the stimulatory effect at low concentrations and inhibitory effect with higher concentrations are discussed.
Bindhu
S J
SJ
Department of Plant Physiology, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur, West Bengal, India.
Bera
A K
AK
D002104:Cadmium / Q000009:adverse effects*; D002734:Chlorophyll / Q000032:analysis*; D000077194:Chlorophyll A; D004305:Dose-Response Relationship, Drug; D007887:Fabaceae / Q000187:drug effects / Q000502:physiology*; D018515:Plant Leaves / Q000033:anatomy & histology / Q000187:drug effects* / Q000502:physiology
D002104:Cadmium; D002734:Chlorophyll; C037184:chlorophyll b; D000077194:Chlorophyll A