Contents of Pigments and Anatomical Structure in the Leaves of Forsythia koreana ‘Sun Gold’

doi:10.7525/j.issn.1673-5102.2020.03.001

Abstract

Abstract: The mature leaves of different canopy layers of Forsythia koreana ‘Sun Gold’ appeared different colors. In order to explore the effect of leaf pigment content and anatomical structure on leaf color, we used deep green leaves of F.koreana as control materials aimed to observe the leaf color of top, middle and bottom canopy, meanwhile measured and analyzed the blade area, chlorophyll a, chlorophyll b, total chlorophyll and carotenoid contents. The total chlorophyll contents of top yellow, middle yellow green and deep light green leaves were 0.51%, 4.44% and 66.47% of control respectively, which were extremely significantly lower than control(P<0.01). However, the chlorophyll a/b ratio of yellow green leaves increased significantly(P<0.05), while the total chlorophyll/carotenoid ratio of yellow green leaves decreased extremely significantly(P<0.01). The chloroplast development of the yellow and yellow green leaves was stay in the monolayer stage, the degree of thylakoid differentiation was lower than control, and the grana lamella of the light green leaves was swollen. The anatomical structure of the leaves showed that the organelle was degraded, and the shape of palisade tissue cells was difficult to distinguish. However, the upper epidermal cell of yellow green leaves was convex. F.koreana ‘Sun Gold’ belongs to the mutant of total chlorophyll and reduced chlorophyll b synthesis, which is characterized by serious chlorophyll deficiency and increased relative carotenoid content. The chloroplast development of F.koreana ‘Sun Gold’ was stagnated and the thylakoid structure was abnormal, which was the main factor for the different color of its leaves, which had nothing to do with the microscopic structure of its leaves.

Key words: Forsythia koreana ‘Sun Gold’, microstructure, ultrastructure, chlorophyll, thylakoid

CLC Number:

Q944.56

SUN Wang-Wang, MENG Xian-Min, XU Xiu-Yuan, WU Min-Hua, QIN Meng-Yang, LIN Meng-Meng, ZHANG Xin-Yan, YUE Guo-Zhong. Contents of Pigments and Anatomical Structure in the Leaves of Forsythia koreana ‘Sun Gold’[J]. Bulletin of Botanical Research, 2020, 40(3): 321-329.

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