Print version ISSN 0103-9016
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 0103-9016. http://dx.doi.org/10.1590/S0103-90162011000200001.
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.