Effect of Melatonin Treatment on the Preservation of the Flower Stalk of Brassica campestris L. ssp. chinesis var. utilis Tsen et Lee after Harvest Under Low Temperature

doi:10.3969/j.issn.1000-2561.2019.07.024

Abstract

Abstract:

In order to extend the shelf-life and maintain the postharvest quality of flowering Chinese cabbage (FCC)(Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee) under low temperature, the flower stalks harvested of FCC were treated with 50, 100 mg/L melatonin respectively, stored at 4 ℃, then the appearance quality was observed, physiological and biochemical indexes related to stored quality were evaluated during storage. The degradation of chlorophyll of the leaves was delayed by melatonin treatment. Much higher levels of soluble sugar and soluble protein content were maintained than the control. Activities of superoxide dismutase and peroxidase were improved under at storage temperature 4 ℃. Meanwhile the content of lignin of the stalk and the expression of cinnamyl alcohol dehydrogenase gene BcCAD4 and BcCAD5 related to lignin synthesis was suppressed by the melatonin treatment. It indicated that the effect of melatonin treatment may be related to the inhibition of the expression of cinnamol dehydrogenase genes.

Key words: flowering Chinese cabbage (Brassica campestris L. ssp. chinesis var. utilis Tsen et Lee), melatonin, preservation effect

CLC Number:

S634.5

JIA Zhiwei,SUN Manli,CHANG Jinmei,SONG Kanghua,ZHANG Lubin. Effect of Melatonin Treatment on the Preservation of the Flower Stalk of Brassica campestris L. ssp. chinesis var. utilis Tsen et Lee after Harvest Under Low Temperature[J]. Chinese Journal of Tropical Crops, 2019, 40(7): 1413-1420.

Figures/Tables 8

Fig. 1 Effects of melatonin on chlorophyll content and yellow leaf rate in in the leaves during storage

Fig. 2 Effects of melatonin on total soluble sugar content in the stems and leaves during storag

Fig. 3 Effects of melatonin on total soluble protein content in the stems and leaves during storage

Fig. 4 Effects of melatonin on MDA content in the stems and leaves during storage

Fig. 5 Effects of melatonin on T-SOD activity in the stems and leaves during storage

Fig. 6 Effects of melatonin on POD activity in the stems and leaves during storage

Fig. 7 Effects of melatonin on lignin content in the stem during storage

Fig. 8 Effects of melatonin on relative expression of BcCAD4 (A), BcCAD5 (B), BcLAC4 (C) and BcLAC17 (D) during storage Different lowercase letters indicate significant difference between treatments (P<0.05).

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