Abstract
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 °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 × Kin) on the parameters tested were statistically significant. Applied kinetin had a dominant role (as indicated by η 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. Pb had a dominant role on total free amino acids (TAA) and leaf relative water content (RWC). The interaction between Kin × Pb influenced the stability of leaf membranes to heat stress in a major way.
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References
Ahmed A and Tajmir-Riahi HA (1993) Interaction of toxic metal ions Cd2+, Hg2+, and Pb2+ with light-harvesting proteins of chloroplast thylakoid membranes. An FTIR spectroscopic study. J Inorg Biochem 50: 235–243
Alia and Pardha Saradhi P (1991) Proline accumulation under heavy metal stress. J Plant Physiol 138: 554–558
Balibrea ME, Rus-Alvarez AM, Bolarian MC and Perez-Alfocea F (1997) Fast changes in soluble carbohydrates and proline contents in tomato seedlings in response to ionic and non-ionic iso-osmotic stresses. J Plant Physiol 151: 221–226
Beevers L (1968) Growth regulator control of senescence in leaf discs of nasturtium (Tropaeolum majus). In: Weightmann F and Setterfield G (ed) Biochemistry and Physiology of Plant Growth Substances, pp 1417–1435
Blum A and Ebercon A (1981) Cell membrane stability as a measure of drought and heat tolerance in wheat. Crop Sci 21: 43–47
Burzynski M(1987) The influence of lead and cadmium on the absorption and distribution of potassium, calcium, magnesium and iron in cucumber seedlings. Acta Physiol Plantarum 9: 229–238
Burzynski M and Grabowski A (1984) Influence of lead on NO —3 uptake and reduction in cucumber seedlings. Acta Soc Bot Pol 53: 77–86
Buysse J and Merckx R (1993) An improved colorimetric methods to quantify sugar content of plant tissue. J Exp Botany 44: 1627–1629
Carlson RW, Bazzaz FA and Rolfe GL (1975) The effect of heavy metals on plants. Environ Res 10: 113–120
Dexter ST (1956) Evaluation of crop plants for winter hardiness. Advances in Agronomy 8: 203–209
Downs RJ and Hellmers H (1975) Environment and Experimental Control of Plant Growth. London/New York/San Francisco: Academic Press, pp 145
Drazkiewicz M (1994) Chlorophyll-occurrence, functions, mechanism of action, effects of external and internal factors [Review]. Photosynthetica 30(3): 321–331.
Ernst WHO, Verkleij JAC and Schat H (1992) Metal tolerance in plants. Acta Bot Neerl 41: 229–248
Fodor F, Sarvari E, Lang F, Szigeti Z and Cseh E (1996) Effects of Pb and Cd on cucumber depending on the Fecomplex in the culture solution. J Plant Physiol 148: 434–439
Gadallah MAA (1994) The combined effects of acidification stress and kinetin on chlorophyll content, dry matter accumulation and transpiration coefficient in Sorghum bicolor plants. Biol Plant 36: 149–153
Gadallah MAA (1995a) Effects of cadmium and kinetin on chlorophyll content, saccharides and dry matter accumulation in sunflower plants. Biol Plant 37: 233–240
Gadallah MAA (1995b) Effects of waterlogging and kinetin on the stability of leaf membranes, leaf osmotic potential, soluble carbon and nitrogen compounds and chlorophyll content of Ricinus plants. Phyton 30: 199–208
Godbold DL and Kettner C (1991a) Use of root elongation studies to determine aluminium and lead toxicity in Picea abies seedlings. J Plant Physiol 138: 231–235
Godbold DL and Kettner C (1991b) Lead influences root growth and mineral nutrition of Picea abies seedling. J Plant Physiol 139: 95–99
Kahle H (1993) Response of roots of trees to heavy metals. Env Exp Bot 33: 99–119
Lee YP and Takahashi T (1966) An improved colorimeteric determination of amino acids with the use of ninhydrin. Anal Biochem 14: 71–77
Levitt J (1980) Responses of Plants to Environmental Stresses (2nd edn). New York: Academic Press, 607 pp
Meidner H (1967) The effect of kinetin on stomatal opening and the rate of intake of carbon dioxide in mature primary leaves of barley. J Exp Bot 18: 556–561
Mohanty N and Mohanty P (1988) Cation effects on primary processes of photosynthesis. In: Singh R and Sawhney SK (eds) Advances in Frontier Areas of Plant Biochemistry. New Delhi: Prentice-Hall, pp 1–18
Murty KS and Majumder SK (1962) Modification of the technique for determination of chlorophyll stability index in relation to studies of drought resistance in rice. Current Science 31: 470–471
Neumann D, Lichtenberger O, Gunther D, Tschiersch K and Nover L (1994) Heat shock proteins induce heavy metal tolerance in higher plants. Planta 194: 360–367
Ostle B (1963) Statistics in Research. Ames: Iowa State University Press, 585 pp
Pahlsson AMB (1989) Toxicity of heavy metals (Zn, Cu, Cd, Pb) to vascular plants. Water, Air and Soil Pollut 47: 287–319
Reilly C (1972) Amino acids and amino acid copper complexes in water soluble extracts of copper and non tolerant Becium hemblei. Z Pflanzen Physiol 66: 294–296
Salama FM and Awadalla AA (1987) The effect of different kinetin application methods on some chlorophyll parameters of two crop plants grown under salinity stress. Phyton 27: 181–193
Sharp RE, Hsiao TC and Kuhn-Silk W (1990) Growth of the maize primary root at low water potentials. II. Role of growth and deposition of hexose and potassium in osmotic adjustment. Plant Physiol 93: 1337–1346
Shlyk AA and Averina NG (1973) Nature of the influence of kinetin on the process of accumulation of protochlorophyllide in etiolated and green barley leaves. Dokl Akad Nauk SSSR 213: 235–238 [in Russ.]
Stefanov K, Popova I, Kamburova E, Pancheva T, Kimenov G, Kuleva L and Popov S (1993) Lipid and sterol changes in Zea mays caused by lead ions. Phytochemistry 33: 47–51
Stefanov K, Popova I, Damyanova B, Kimenov G and Popov S (1992) Lipid and sterol changes in Phaseolus vulgaris caused by lead ions. Phytochemistry 31: 3745–3748
Stefanov K, Seizova K, Popova I, Petkov V, Kimenov G and Popov S (1995) Effect of lead ions on the phospholipid composition in leaves of Zea mays and Phaseolus vulgaris. J Plant Physiol 147: 243–246
Steffens JC (1990) The heavy metal-binding peptide of plants. Ann. Rev. Plant Physiol. Plant Mol Biol 41: 553–575
Stiborova M, Ditrichova M and Brezinva A (1987) Effect of heavy metal ions on growth and biochemical characteristics of photosynthesis of barley and maize seedlings. Biol Plant 29: 453–467
Stobart AK, Shewry PR and Thomas DR (1972) The effect of kinetin on chlorophyll synthesis in ageing etiolated barley leaves exposed to light. Phytochemistry 11: 571–577
Todd GW and Basler E (1965) Fate of various protoplasmic constituents in droughted wheat plants. Phyton 22: 79–85
Van Assche F and Clijsters H (1990) Effects of metals on enzymes activity in plants. Plant Cell and Environ 13: 195–206
Weatherley PE (1950) Studies in the water relations of the cotton plants. I. The field measurement of water deficits in leaves. New Phytol 49: 81–97
Williams S and Hester PC (1983) Kinetin increases water permeability of phosphatidylcholine lipid biolayer. Plant Physiol 71: 524–530
Wozny A and Jerczynska E (1991) The effect of lead on early stages of Phaseolus vulgaris L. growth in vitro conditions. Biol Plant 33: 32–39
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Sayed, S.A. Effects of lead and kinetin on the growth, and some physiological components of safflower. Plant Growth Regulation 29, 167–174 (1999). https://doi.org/10.1023/A:1006216630915
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DOI: https://doi.org/10.1023/A:1006216630915