Effects of Pb-surplus and P-deficiency on ATP content in plant leaves [beans, pseocereal]
1980
Sung, M.W. (Gyungsang National Univ., Jinju (Korea R.). Dept. of Biology) | Kwon, B.K. (Gyungbuk National Univ., Daegu (Korea R.))
Kidneybean (Phaseolus vulgaris L.) and buckwheat (Fagopyrum esculentum Monch) seedlings were cultured with Hoagland solution, one composed of various Pb concentrations 0 to 1,000 ppm containing 30 ppm P, and the other composed of various P concentrations 0 to 1,000 ppm containing 30 ppm Pb for a month during June to July. By Pb-surplus over 100 ppm, the margins of buckwheat were curled down and turned into yellow-brown chlorosis, but the leaves of kidneybean were become dark-green at an early stage, and then developed chlorosis, finally shedded earlier than the control. Pb-toxicity was similar to the symptoms of P-deficiency. The ratio, 3/1 of chlorophyll a/b at an early stage, was unaffected by Pb-surplus of P-deficiency, but at the later stage it was altered. ATP content with Pb-surplus of 100 ppm was decreased by 69% in kidneybean leaves and by 38% in buckwheat leaves, and it with P-deficiency was decreased by 75% in kidneybean leaves and by 43% in buckwheat leaves. In the assay of ATP content of the leaves at intervals of three hours for one day of July in this year, the rhythms of ATP level were unaffected by light of temperature although the amplitude of the level was modified. The rhythms of Pb-surplus and P-deficiency plants were observed at the lower range of ATP content that of control.
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