Physiological Characteristics of Davidia involucrata Bracts and Leaves with Different Colors

doi:10.7525/j.issn.1673-5102.2020.04.004

Abstract

Abstract: To explain the coloration mechanism of pink Davidia involucrata Baill., D.involucrata bracts and leaves with two different colors were selected to study the physiological indexes including pigment, basal metabolite content and enzyme activity. The flavonoid content(FC) of pink leaves was 1.52 times that of green leaves. Flavonoid contents in two colors of bracts were low, and the difference was not obvious(P>0.05). The anthocyanin contents(AC) in the bracts and leaves of pink plants were 1.68 times and 3.67 times that of common ones, and the difference was extremely obvious(P<0.01). The photosynthetic pigment contents of pink leaves were slightly lower than that of green leaves(P>0.05). Compared to common plants, pink ones accumulated more soluble sugar(SS) and proline(Pro) but less soluble protein(SP)(P<0.05). Compared to the leaves, the bracts accumulated less soluble sugar(SS) but much more proline(Pro) and soluble protein(SP)(P<0.01). The activities of phenylalanine ammonia-lyase(PAL) and chalcone isomerase(CHI) of pink ones were significantly higher(P<0.01), while peroxidase(POD) and superoxide dismutase(SOD) activities in two colors of plants were not much different(P>0.05). The enzyme activities of the bracts were mostly higher than that of the leaves(P<0.05), especially the CHI activity. The contents of flavonoid and anthocyanin were significantly positively correlated with soluble sugar, proline contents, PAL and CHI activities, but negatively correlated with soluble protein content. In conclusion, anthocyanin directly caused the bracts to turn pink, and flavonoid and anthocyanin caused the leaves to be pink. Soluble sugar, soluble protein, proline, PAL and CHI affected the anabolism of anthocyanin.

Key words: pink Davidia involucrata, anthocyanin, basal metabolite, enzyme activity

CLC Number:

Q945.79

LIANG Ling, JIANG Jie-Bei, ZHANG Teng-Ju, Lü Jia-Yao, CHEN Xiao-Hong. Physiological Characteristics of Davidia involucrata Bracts and Leaves with Different Colors[J]. Bulletin of Botanical Research, 2020, 40(4): 505-513.

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