Figure 1
Organic acid secretions (μl per cm3) of (A) cabbage, (B) lettuce, and (C) Napa cabbage compared between control and drought stress (15% PEG) treatments. Error bars represent the standard deviation; (n = 4)
Figure 2
Enzyme activity (U/L) recorded for cabbage seedlings subjected to control, and 5 mM of respective organic acid treatments: (A) catalase (CAT), (B) ascorbate peroxidase (APX). Error bars represent the standard deviation; (n = 4)
Figure 3
Enzyme activity (U/L) recorded for lettuce seedlings subjected to control, and 5 mM of respective organic acid treatments: (A) catalase (CAT), (B) ascorbate peroxidase (APX). Error bars represent the standard deviation; (n = 4)
Figure 4
Enzyme activity (U/L) recorded for Napa cabbage seedlings subjected to control, and 5 mM of respective organic acid treatments: (A) catalase (CAT), (B) ascorbate peroxidase (APX). Error bars represent the standard deviation; (n = 4); a double asterisk indicates a significant difference when compared to the control (p < 0.01)
Table 1
P-values of two-way ANOVA for determining significance in root length and shoot length for cabbage and Napa cabbage under different organic acid pretreatments and drought stress treatments
| Cabbage | Napa cabbage | |||
|---|---|---|---|---|
| Root | Shoot | Root | Shoot | |
| Pretreatment (P) | < 0.001 | 0.122 | < 0.001 | 0.191 |
| Drought stress (D) | 0.332 | < 0.001 | < 0.001 | 0.009 |
| P × D | 0.055 | 0.002 | 0.126 | 0.101 |
Figure 5
(A) root length and (B) shoot length under regular watering during germination (RW)/application of PEG solution (PEG) treatment and varying organic acid pretreatments for cabbage. Error bars represent the standard deviation; (n = 30)
Figure 6
(A) root length and (B) shoot length under regular watering during germination (RW)/application of PEG solution (PEG) treatment and varying organic acid pretreatments for Napa cabbage. Error bars represent the standard deviation; (n = 30)