TY - JOUR
T1 - Strigolactones Modulate Salicylic Acid-Mediated Disease Resistance in Arabidopsis thaliana
AU - Kusajima, Miyuki
AU - Fujita, Moeka
AU - Soudthedlath, Khamsalath
AU - Nakamura, Hidemitsu
AU - Yoneyama, Koichi
AU - Nomura, Takahito
AU - Akiyama, Kohki
AU - Maruyama-Nakashita, Akiko
AU - Asami, Tadao
AU - Nakashita, Hideo
N1 - Funding Information:
Funding: This work received partial support for K.Y., T.N., K.A., T.A. and H.N. (Hideo Nakashita) from the Ministry of Agriculture, Forestry, and Fisheries of Japan under the Science and Technology Research Promotion Program for Agriculture, Forestry, Fisheries, and Food Industry (27004A); also, from Grant-in-Aid for JSPS Fellows 19J14665 for M.F., and from JSPS KAKENHI Grant Numbers 18K05656 for H.N. (Hideo Nakashita).
Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/5/1
Y1 - 2022/5/1
N2 - Strigolactones are low-molecular-weight phytohormones that play several roles in plants, such as regulation of shoot branching and interactions with arbuscular mycorrhizal fungi and parasitic weeds. Recently, strigolactones have been shown to be involved in plant responses to abiotic and biotic stress conditions. Herein, we analyzed the effects of strigolactones on systemic acquired resistance induced through salicylic acid-mediated signaling. We observed that the systemic acquired resistance inducer enhanced disease resistance in strigolactone-signaling and biosynthesis-deficient mutants. However, the amount of endogenous salicylic acid and the expression levels of salicylic acid-responsive genes were lower in strigolactone signaling-deficient max2 mutants than in wildtype plants. In both the wildtype and strigolactone biosynthesis-deficient mutants, the strigolactone analog GR24 enhanced disease resistance, whereas treatment with a strigolactone biosynthesis inhibitor suppressed disease resistance in the wildtype. Before inoculation of wildtype plants with pathogenic bacteria, treatment with GR24 did not induce defense-related genes; however, salicylic acid-responsive defense genes were rapidly induced after pathogenic infection. These findings suggest that strigolactones have a priming effect on Arabidopsis thaliana by inducing salicylic acid-mediated disease resistance.
AB - Strigolactones are low-molecular-weight phytohormones that play several roles in plants, such as regulation of shoot branching and interactions with arbuscular mycorrhizal fungi and parasitic weeds. Recently, strigolactones have been shown to be involved in plant responses to abiotic and biotic stress conditions. Herein, we analyzed the effects of strigolactones on systemic acquired resistance induced through salicylic acid-mediated signaling. We observed that the systemic acquired resistance inducer enhanced disease resistance in strigolactone-signaling and biosynthesis-deficient mutants. However, the amount of endogenous salicylic acid and the expression levels of salicylic acid-responsive genes were lower in strigolactone signaling-deficient max2 mutants than in wildtype plants. In both the wildtype and strigolactone biosynthesis-deficient mutants, the strigolactone analog GR24 enhanced disease resistance, whereas treatment with a strigolactone biosynthesis inhibitor suppressed disease resistance in the wildtype. Before inoculation of wildtype plants with pathogenic bacteria, treatment with GR24 did not induce defense-related genes; however, salicylic acid-responsive defense genes were rapidly induced after pathogenic infection. These findings suggest that strigolactones have a priming effect on Arabidopsis thaliana by inducing salicylic acid-mediated disease resistance.
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U2 - 10.3390/ijms23095246
DO - 10.3390/ijms23095246
M3 - Article
C2 - 35563637
AN - SCOPUS:85129510858
SN - 1661-6596
VL - 23
JO - International Journal of Molecular Sciences
JF - International Journal of Molecular Sciences
IS - 9
M1 - 5246
ER -