SYNCHRONIZING THE in vitro GERMINATION OF Psidium guineense Sw. SEEDS BY MEANS OF OSMOTIC PRIMING

Autor: Márcia Adriana Carvalho dos Santos, Mailson Monteiro do Rego, Manoel Abilio de Queiroz, Bárbara França Dantas, Wagner Campos Otoni
Jazyk: English<br />Spanish; Castilian<br />Portuguese
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Zdroj: Revista Árvore, Vol 40, Iss 4, Pp 649-660
Druh dokumentu: article
ISSN: 1806-9088
0100-6762
DOI: 10.1590/0100-67622016000400008
Popis: ABSTRACT The Brazilian guava (Psidium guineense Swartz) is seed-propagated and, being native to the Caatinga biome, may frequently have uneven germination.Thus, we aimed to evaluate the synchronization of the in vitro seed germination of three accessions of the Brazilian guava, using water, polyethyleneglycol (PEG 6000), and potassium nitrate (KNO3) at different potentials and times of osmotic priming. Seeds from three accessions of the Brazilian guava (Y85, Y93,and Y97) from the UNEB/BA Germplasm Active Bank were subjected to the following pretreatments: -0.6, -1.0, -1.4, and -1,8 MPa PEG 6000; 10 and 20% KNO3 for 24h; 10 and 20% KNO3 for 48h; water for 24 and 48h; and non-primed seeds as the control. The experimental design was therefore a 10x3+1 factorial scheme. We assessed the germination percentage (G), mean germination time (MGT), germination speed (GS), and germination speed index (GSI). Data was subjected to analysis of variance followed by a means test (Duncan at 5% probability) and regression. There was interaction between the priming treatments and accessions for all evaluated features, except G. PEG 6000 decreased the MGT (from 6 to 8 days) and increased GS and GSI of seeds from all three accessions at potentials -1.0 to -1.5 MPa.Water-priming had a positive effect on MGT, GS, and GSI of accession Y85 seeds. KNO3 negatively affected germination of seeds from all three accessions. Thereby, we could synchronize seed germination of accessions Y85 and Y97 with PEG 6000.
Databáze: Directory of Open Access Journals
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