_______ , a florigen that stimulates flowering, is a positive regulator of H+-ATPase and blue-light-induced stomatal opening.
Fowering Locus T
Ethylene
Phytochrome
Abscisic acid
FLOWERING LOCUS T (FT) is a florigen that stimulates flowering and is expressed in the guard cells and regulates the stomatal opening. This pigment is involved in photoperiodism and is referred to as a phytochrome. Hence, option 1 is the correct answer.