Composition for regenerating and stimulating growth of plants and for adapting plants to different stress factors

A method for stimulating regeneration, growth, and/or resistance to stress, or increasing the lifetime, of a plant, or cutting thereof, or its flower or fruit, comprising administering to the plant or portion thereof an effective amount of the compound of structure I:

• or a solvate or isomer thereof, or an agrochemically or physiologically acceptable salt thereof, wherein:
• A is an effector—antioxidant of structure:
• or reduced form thereof, wherein:
• m is an integer from 1 to 3;
• each Y is lower alkyl or lower alkoxy;
• or two adjacent Y groups, together with carbon atoms to which they are attached, form a following structure:
• or reduced form thereof,
• wherein R1 and R2 may be the same or different and are each independently lower alkyl or lower alkoxy;
• L is a linker group, comprising:
• a) a straight or branched hydrocarbon chain which can be optionally substituted by one or more substituents and optionally contains one or more double or triple bonds;
• or
• b) a natural isoprene chain;
• n is integer from 1 to 20;
• B is a targeting group, comprising:
• Sk+Z−:
• wherein:
• Sk is a triphenylphosphonium cation;
• and
• Z is an acceptable anion;
• provided that is not ubiquinone or tocopherol or mimetic of superoxide dismutase or ebselen;
• while L is divanlent decyl or divalent pentyl or divalent propyl radical;
• and
• an agrochemically or physiologically acceptable carrier thereof.