Plant stomatal opening regulator

A plant stomatal opening regulator comprising at least one member selected from the group consisting of a compound represented by formula (1), a salt thereof, and a solvate thereof:

• wherein A represents an optionally substituted 5- or 6-membered monocyclic ring, Ls are the same or different and each represents an alkylene group optionally substituted with an alkyl group and/or an aryl group, and n represents an integer of 1 to 6;
• wherein when A is a benzene ring and n is 1, A is a benzene ring substituted with at least one member selected from the group consisting of an optionally substituted aryl group, a cyano group, an iodine atom, and an optionally substituted alkoxycarbonyl group, and/or L is an alkylene group substituted with an alkyl group and/or an aryl group.

A plasma membrane proton pump phosphorylation inhibitor comprising at least one member selected from the group consisting of a compound represented by formula (1), a salt thereof, and a solvate thereof:

• wherein A represents an optionally substituted ring, L represents a linker, and n represents an integer of 1 to 6.

A plant covering or support material comprising at least one member selected from the group consisting of a compound represented by formula (1), a salt thereof, and a solvate thereof:

• wherein A represents an optionally substituted ring, L represents a linker, and n represents an integer of 1 to 6.