Influence of laser beams on the variability of traits in spring barley
 
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Institute of Plant Genetics, Polish Academy of Sciences, Strzeszyńska 34, 60-479 Poznań, Poland
Acceptance date: 2000-11-09
 
Int. Agrophys. 2000, 14(2): 227–232
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ABSTRACT
Laser is one of the sources for inducing a biostimulation effect and genetic changes in higher plants. Lower doses of laser activate plants, resulting in increasing bioenergetical potential of the cell and higher activation their biochemical and physiological processes. Higher doses influence genetical material of the cell leading to genetic changes of plant traits. The seeds of cv. Maresi spring barley (Hordeum vulgare L.) were irradiated with different doses of laser beams and additionally treated with chemomutagens. For the experiment, a helium-neon laser (He-Ne) with the wavelength of 632.8 nm and power density 1 mW cm-2 was chosen. In the M1 progeny reduction or stimulation of morphological and yield-contributing traits was estimated. The frequency of chlorophyll mutations was analysed in M2 and selection of morphological mutants was started in this generation. In the M4 generation variability of traits in the mutants obtained was estimated. The results showed that in the M1 progeny lower doses of laser beams (1/2 and 1.0 h) induced biostimulation effect of the analysed traits. Higher doses (2.0 h) induced reduction of the traits value in comparison to the control cv. Maresi. In addition, laser beams were able to induce chlorophyll and morphological mutations in the M2 progeny. In comparison to the initial cv. Maresi, the mutants were characterised by higher variability of morphological and yieldcontributing traits. The mutants with desirable yield structure parameters were selected. The results obtained show that the helium-neon laser with the wavelength of 632.8 nm can be an effective tool for increasing variability of traits in spring barley.
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