Exogenously applied methyl jasmonate increased the resistance of postharvest pear fruit to blue mold

Ming Chen; Zhenyu Luo; Xianyang Zhao; Shucheng Li; Fan Wu; Jinyin Chen; Miaolian Xiang; Ming Chen; Zhenyu Luo; Xianyang Zhao; Shucheng Li; Fan Wu; Jinyin Chen; Miaolian Xiang

doi:10.48130/FruRes-2022-0011

Figures (5) Tables (1)

Figure 1.
Symptoms in pear fruit of methyl jasmonate (MeJA) and salicylhydroxamic acid (SHAM) treatment followed by inoculation with Penicillium expansum. (a) Control; (b) 100 μmol/L MeJA treatment; (c) 100 μmol/L SHAM treatment. For experimental details see the Materials and Methods.
Figure 2.
Changes in the activities of PPO (a), POD (b), CAT (c) and SOD (d) in pear fruit inoculated with Penicillium expansum after 100 μmol/L MeJA treatment for 36 h. Values are the means of three replicates and vertical bars indicate the standard errors.
Figure 3.
Changes in the activities of CHI (a) and GLU (b) in pear fruit inoculated with Penicillium expansum after 100 μmol/L MeJA treatment for 36 h. Values are the means of three replicates, and vertical bars indicate the standard errors.
Figure 4.
Changes in the contents of total phenol (a) and MDA (b) content in pear fruit inoculated with of Penicillium expansum after 100 μmol/L MeJA treatment for 36 h. Values are the means of three replicates, and vertical bars indicate the standard errors.
Figure 5.
Expression analysis of defence-related genes including PpPPO (a), PpPOD (b), PpCAT (c) Cu-ZnSOD (d), PpCHI (e) and PpGLU (f) in pear fruit inoculated with Penicillium expansum after 100 μmol/L MeJA treatment for 36 h. Values are the means of three replicates and vertical bars indicate the standard errors. Different letters indicate significant differences (p < 0.05) between the treatments determined using the Duncan’s multiple range test.

MeJA/SHAM	Lesion diameter (mm)	Induction effect (%)	MeJA treatment time (h)	Lesion diameter (mm)	Induction effect (%)
CK	17.50 ± 0.59^ab	0	0	22.95 ± 0.45^a	0
10 μmol/L MeJA	16.89 ± 1.42^b	3.46 ± 2.39^b	12	21.26 ± 0.83^a	7.34 ± 2.88^b
100 μmol/L MeJA	14.94 ± 1.13^c	14.59 ± 1.57^a	24	21.52 ± 1.12^a	6.26 ± 1.60^b
1,000 μmol/L MeJA	20.09 ± 0.25^a	−14.80 ± 0.71^c	36	19.45 ± 0.42^b	15.23 ± 1.46^a
100 μmol/L SHAM	21.45 ± 0.86^a	−22.58 ± 0.84^d	48	20.84 ± 0.25^a	9.20 ± 0.80^b
Values are the means of three replicates. Data in the table are mean ± SD. Different letters indicate significant difference (p < 0.05) between the treatments determined using the Duncan's multiple range test.

Table 1.

Effects of MeJA treatment on induction resistance in pear fruit inoculated with Penicillium expansum.