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Scientia Agricola

On-line version ISSN 1678-992X


MENESES, Carlos Henrique Salvino Gadelha et al. Germination of cotton cultivar seeds under water stress induced by polyethyleneglycol-6000. Sci. agric. (Piracicaba, Braz.) [online]. 2011, vol.68, n.2, pp.131-138. ISSN 1678-992X.

The physiological quality of cotton cultivar seeds (Gossypium hirsutum var. latifolium L.) was evaluated in laboratory by the simulation of water potentials with polyethyleneglycol-6000 (0.0; -0.2; -0.4; -0.6; -0.8 and -1.0 MPa), at 25ºC using germitest paper as substrate. A completely randomized design in a 4 × 6 factorial scheme with four replications of 50 seeds each was used. The studied variables were: germination percentage, first count of germination, germination velocity index, accelerated aging in water, electrical conductivity, humidity, vigor classification, radicle length and radicle/shoot length ratio. The effect of water stress on seed viability and on plantlet vigor was severe at potentials below -0.4 MPa. The 'CNPA 187 8H' cultivar was the least sensitive to the tested osmotic potentials, both in terms of germination and of vigor. The 'BRS-201' cultivar was mostly affected by the viability and vigor tests under water deficit conditions. Differential viability and vigor between cultivars were observed under the water stress levels.

Keywords : Gossypium hirsutum var. latifolium L.; PEG-6000; vigor; water potential.

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