Effects of lead and kinetin on the growth, and some physiological components of safflower
1999
Sayed, S.A.
Pollution of the root environment with excess of Pb retarded shoot growth, decreased chlorophyll (Chl) content and reduced Chl stability (CSI) to heat. Plants growing in Pb polluted soil accumulated much more free amino acids and less soluble sugars than the control plants. Stability of leaf membranes to heat (51 degrees C) or dehydration stresses (40% polyethylene glycol, 6000) decreased in response to Pb pollution where the membranes of leaf discs excised from Pb-treated plants were damaged more than those taken from plants growing in Pb free soil. Supplying kinetin ameliorated the deleterious effects of Pb pollution on the parameters tested. Kinetin-treated plants had higher Chl, soluble sugars content and produced more biomass in their shoots. Also, kinetin increased leaf membrane stability especially in Pb-treated plants, effectively protected chlorophyll degradation by heat and increased Chl a and b stability index; the most effective concentration was 10 mg L-1. The effects of Pb and kinetin as well as their interaction (Pb x Kin) on the parameters tested were statistically significant. Applied kinetin had a dominant role (as indicated by eta 2) in affecting shoot growth, soluble sugars, Chl a and b contents, stability of leaf membranes to dehydration stress as well as the Chl stability index. Ph had a dominant role on total free amino acids (TAA) and leaf relative water content (RWC). The interaction between Kin x Pb influenced the stability of leaf membranes to heat stress in a major way.
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