Mutant

Guard cell

Biology

Botany

Gene

Strigolactone

Abscisic acid

Cell biology

Nitric oxide

Biochemistry

Abiotic stress

Organic chemistry

Hydrogen peroxide

Chemistry

Acclimatization

Salicylic acid

Arabidopsis

New Phytologist

Accumulating data indicate that strigolactones (SLs) are implicated in the response to environmental stress, implying a potential effect of SLs on stomatal response and thus stress acclimatization. In this study, we investigated the molecular mechanism underlying the effect of SLs on stomatal response and their interrelation with abscisic acid (ABA) signaling. The impact of SLs on the stomatal response was investigated by conducting SL-feeding experiments and by analyzing SL-related mutants. The involvement of endogenous ABA and ABA-signaling components in SL-mediated stomatal closure was physiologically evaluated using genetic mutants. Pharmacological and genetic approaches were employed to examine hydrogen peroxide (H2 O2 ) and nitric oxide (NO) production. SL-related mutants exhibited larger stomatal apertures, while exogenous SLs were able to induce stomatal closure and rescue the more widely opening stomata of SL-deficient mutants. The SL-biosynthetic genes were induced by abiotic stress in shoot tissues...

Strigolactone‐triggered stomatal closure requires hydrogen peroxide synthesis and nitric oxide production in an abscisic acid‐independent manner