PHENOTYPIC RESPONSE OF WILLOW CUTTINGS TO HEAVY METALS. A PRELIMINARY LABORATORY TEST
The present paper analyses some biometric characteristics of willow cuttings in a comparative laboratory test with heavy metals. Six Swedish hybrids (Tora, Tordis, Klara, Olof, Stina and Sven) and one Romanian hybrid (1077) have been tested. As plant material were used one-year-old cuttings (5-10 cm long), with 2-5 buds each. There were ten experimental variants for each genotype: three concentrations of cadmium (1.0; 3.0, 6.0 ppm), nickel (50.0, 150.0, 450.0 ppm), lead (50.0, 150.0, 450.0 ppm) and Control (tap water). Biometrical observations on: the roots number and length, the shoots number and length, the leaves number/shoot in the days 7 and 15, were performed. All hybrids are quite resistant to heavy metals except hybrid 1077, for this one the shoots percent is much lower for all heavy metals concentration compared with the control one.
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