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The effects of electron correlation in the quasi-two-dimensional organicconductor \alpha-(BEDT-TTF)2I3 are investigated theoretically by using anextended Hubbard model with on-site and nearest-neighbor Coulomb interactions.A variational Monte Carlo method is applied to study its ground-stateproperties. We show that there appears a nonmagnetic horizontal-stripe chargeorder in which nearest-neighbor correlation functions indicate a tendencytoward a spin-singlet formation on the bonds with large transfer integralsalong the charge-rich stripe. Under uniaxial pressure, a first-order transitionfrom the nonmagnetic charge order to a zero-gap state occurs. Our results on aspin correlation length in the charge-ordered state suggest that a spin gap isalmost unaffected by the uniaxial pressure in spite of the suppression of thecharge disproportionation. The relevance of these contrasting behaviors in spinand charge degrees of freedom to recent experimental observations is discussed.

Correlation Effects on Charge Order and Zero-Gap State in the Organic Conductor \alpha-(BEDT-TTF)2I3