Effect of lanthanide chloride on photosynthesis and dry matter accumulation in tobacco seedlings
Received: 27 April 2000 Accepted: 30 June 2000 DOI:
Cite this article as: Chen, W., Tao, Y., Gu, Y. et al. Biol Trace Elem Res (2001) 79: 169. doi:10.1385/BTER:79:2:169 Abstract
To investigate the physiological effects of rare earth ions, we have studied the effect of LaCl
3 on the photosynthetic light reactions in tobacco ( Nicotiana tobacum). When treated with 5–20 mg/L LaCl 3 in Hoagland solution by water culture, the dry matter accumulation of different parts in tobacco, the content of chlorophyll increased gradually, but decreased when the concentration of LaCl 3 was ≥ 50 mg/L. The optimum concentration for growth appeared to be about 20 mg/L of LaCl 3 in nutrient solution. La 3+ promoted the activities of the Hill reaction, Mg 2+-ATPase, and stimulated the rate of photophosphorylation in chloroplast at low concentrations, but inhibited them at high concentrations. It is concluded that La 3+ stimulated the growth of tobacco seedlings and accelerated the photosynthetic light reactions at suitable concentration in vivo. Index Entries Lanthanum chloride tobacco chlorophyll dry matter photosynthetic light reaction References
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