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Table1. Effects of inducers on the resistance of cucumber to powdery mildew.
Inducers
Concentrations Date of symptom
appeared
Disease incidence
(%)
Disease index
Contol Water 27 Dec. 66.4 a 83.5 a 1
BTH 75µg/ml 31 Dec. 21.5 d 15.3 f
JZG 1000 x 31 Dec. 25 c 30.4 d
JZGP-1 500 x 31 Dec. 25.2 c 26.4 e
JZGP-2 1000 x 30 Dec. 33.5 b 50.3 b
KDF 400 x 30 Dec. 34.0 b 40.63 c
1
Different letters indicate significant differences among the treatments (P < 0·05).
Table 2. Chitinase activity in leaves at various times after inducers treatments as
measured by fresh weight (FW) changes (U/g FW).
Inducers
Concentrations
2
Days after treatment
5 8
JZGP 500 x 20.4 c 108.5 bc 1 125.2 a
BTH 75µg/ml 23.4 b 129.0 a 132.8 a
JZG 1000 x 28.3 a 113.0 b 128.2 a
KDF 400 x 22.6 b 99.1 cd 117.0 b
Control 19.2 c 86.9 d 107.0 b
1
Different letters indicate significant differences among the treatments (P < 0·05).
Table 3. Activities of beta-1,3-glucanase in leaves at various times after inducers treatment
as measured by fresh weight (FW) changes (U/g FW).
Inducers
Concentrations
2
Days after treatment
5 8
JZGP 500 x 339.8 b 473.0 a 1 650.4 c
BTH 75µg/ml 320.7 c 320.2 c 595.8 c
JZG 1000 x 521.0 a 457.9 ab 856.9 a
KDF 400 x 290.6 d 527.4 a 802.9 a
Control 288.5 d 369.4 bc 433.7 d
1 Different letters indicate significant differences among the treatments (P < 0·05).
Cucurbit Genetics Cooperative Report 28-29: 7-11 (2005-2006) 11