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Plasma Medicine

ISSN Print: 1947-5764
ISSN Online: 1947-5772

Plasma Medicine

DOI: 10.1615/PlasmaMed.2017018999
pages 361-373

Dielectric-Barrier Discharge Plasma Effect on the Physico-Chemical Properties of the Seed Coat and Seed Germination of Umbu (Spondias tuberosa Arr Camara)

Clodomiro Alves Junior
Department of Exact and Natural Sciences, Federal Rural University of Semiarid, Mossoró 59.625-900, Brazil
Mikelly Lima de Farias
Labplasma, Federal Rural University of Semiarid, Mossoró 59.625-900, Brazil
Jussier de Oliveira Vitoriano
Labplasma, Federal Rural University of Semiarid, Mossoró 59.625-900, Brazil
Regina Celia de Sousa
Department of Physics, Federal University of Maranhão, São Luiz 65080-805, Brazil
Marcicleide Lima do Espirito Santo
Department of Physics, Federal University of Maranhão, São Luiz 65080-805, Brazil
Salvador Barros Torres
Department of Plant Science, Federal Rural University of Semiarid, Mossoró 59.625-900, Brazil

ABSTRACT

Spondia tuberose seeds are enclosed by the walls of a rigid, woody, lignified endocarp. Plasma treatment of such seeds is extremely difficult due to the necessary distance for the plasma species to penetrate until reaching the seed. Several studies have been published describing the success of the plasma treatment in increasing the wettability of seed coats; however, no investigation has also been carried out in situations in which the barrier is not just the integument, but also other anatomical complexities of the seed, such as the walls of the endocarp. In this study, the S. tuberose seed, which is enclosed by an impermeable endocarp, was treated by atmospheric plasma to verify whether the plasma is effective in penetrating to the seed, modifying its germinative properties. Significant changes were observed in the absorption of water leaching substances, germination, and seedling vigor due to plasma treatment. These results show that the plasma, through a mechanism that needs to be better investigated, alter the physical and physiological responses of the seed.