Patent ID: 8841236

Claim:
A method for imparting a stress tolerance to a plant, comprising the step of applying, to a plant placed under a stressful cultivation condition that yields a plant stress level of 111 to 200%, a plant stress tolerance imparting composition comprising at least one cellulose derivative selected from the group consisting of methyl cellulose (MC), hydroxymethyl cellulose (HMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), propyl cellulose (PC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), hydroxyethyl propyl cellulose (HEPC), methyl ethyl cellulose (MEC), methyl propyl cellulose (MPC) and ethyl propyl cellulose (EPC); catechins; and water, the cellulose derivative being contained in an amount of 45.0 to 99.5 wt % of total components of the plant stress tolerance imparting composition except water.