Effect of maize seed laser irradiation on plant photosynthetic activity

Antonov, M.; Stanev, V.; Velichkov, D.; Tsonev, T.

Fiziologiya na Rasteniyata 12(1): 28-34


ISSN/ISBN: 0324-0290
Accession: 005252515

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Investigations were made with the two maize hybrids H-708 and Px-20. The seeds were irradiated by a helium-neon quantum generator (Lvov-1 Electronica) with output power of 24 MW and 632.8 nm wave length. Once and twice irradiated seeds were sown on the 2nd, 5th and 10th day post irradiation. Changes in leaf area, chlorophyll content in the leaves, photosynthetic rate and its dependence on temperature and light, transpiration, stomatal resistance to CO2 and total, dry matter of the overground plant part have been traced. It has been found that maize seed irradiation with laser rays does not affect the chlorophyll content in the leaves of plants. Photosynthetic rate does not depend on the cultivar characteristics of the crop. Single and repeated irradiation of the hybrid H-708 in most cases enhanced photosynthetic rate, but a similar effect was not observed in Px-20. Transpiration and CO2 stomatal resistance are not equally affected by irradiation. Maize seed irradiation with laser rays enhanced the ability of the photosynthetic apparatus of entire plants to use more efficiently high light intensities. Leaf area and total plant dry matter increased in case of sowing on the 2nd and 5th day and a single irradiation and in case of sowing on the 5th and 10th day and twice repeated irradiations.