Fig. 1. Growing stage of Chinese cabbage both growing control (A) and growing drought-treated (B). The soil water content in control plant and drought-treated plant was maintained at 10% and 30%, respectively.
Fig. 2. Effect of drought stress on soil water content for three weeks. The soil water content in drought-stressed plants was measured and maintained at 10% by Time Domain Reflectometry (TDR). The control plants were maintained at 30% soil water content during the experiment period.
Fig. 3. High-performance liquid chromatography (HPLC) of total free amino acid in Chinese cabbage at 1 week after drought stress. The soil water content in control plant and drought-treated plant was maintained at 10% and 30%, respectively. 1, Aspartate; 2, Glutamate; 3, Asparagine; 4, Serine; 5, Vitamin U; 6, Glutamine; 7, Histidine; 8, Glycine; 9, Threonine; 10, Arginine; 11, Alanine; 12, GABA; 13, Tyrosine; 14, Cystine; 15, Valine; 16, Methionine; 17, Norvaline; 18, Tryptophan; 19, Phenylalanine; 20, Isoleucine; 21, Leucine; 22, Lysine.
Fig. 4. High-performance liquid chromatography (HPLC) of carotenoid in Chinese cabbage at 2 weeks after drought stress. The soil water content in control plant and drought-treated plant was maintained at 10% and 30%, respectively. 1, Lutein; 2, Zeaxanthin; 3, α-Carotene; 4, β-Carotene.
Fig. 5. High-performance liquid chromatography (HPLC) of proline in Chinese cabbage at 2 weeks after drought stress. The soil water content in control plant and drought-treated plant was maintained at 10% and 30%, respectively.
Fig. 6. Effect of drought stress on proline content in Chinese cabbage. Line above the bar represents the standard deviation of the mean (n = 5).
Table 1. Effect of drought stress on leaf number, leaf area and fresh weight of Chinese cabbage
Table 2. Effect of drought stress on individual free-amino acid content in Chinese cabbage
Table 3. Effect of drought stress on total carotenoid content in Chinese cabbage
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