Studies of the shade-tolerance of four ornamental grass and sedge cultivars

doi:10.11686/cyxb2018375

Abstract

Abstract: This study investigated the shade tolerance of four ornamental grass and sedge cultivars Festuca glauca, Calamagrostis epigeios, Carex lanceolata and Carex giraldiana under different shading treatments. Morphological indices, chlorophyll levels, chlorophyll a∶b ratio, soluble sugar, activity of superoxide dismutase (SOD) and peroxidase (POD) were determined under artificial shading treatments (CK, unshaded; T₁, 48.5% shade; T₂, 70% shade; T₃, 87% shade) to evaluate the resistance to the four ornamental grass and sedge cultivars to shading. With moderately increased shade, plant height, crown diameter, leaf length, chlorophyll content, SOD and POD activity were increased, but under more severe shade they were decreased, compared to CK plants. Chlorophyll a∶b ratio and soluble sugar content were significantly decreased by shading, compared to control plants. There were different patterns of change among the different parameters measured in the different cultivars. The increases in plant height, crown width, leaf length, chlorophyll content, SOD activity and POD activity of F. glauca and C. epigeios for T₁ were significantly higher than those of other treatments. By comparison, for the same parameters in C. giraldiana and C. lanceolata values were markedly higher in T₂ than in the other treatments. In this experiment, the four ornamental species tested responded to shading by etiolation responses, increased chlorophyll content, and SOD and POD activities and reduced chlorophyll a:b ratio. In addition, there were differences in the response mechanism and shade tolerance of the four ornamental grasses and sedges. C. giraldiana and C. lanceolata were shown to be tolerant of moderate shade with a shade intensity of 70%; while F. glauca and C. epigeios only tolerated endure a light shading environment with a shading degree of 48.5%. A subordinate function analysis indicated that the shade tolerance of four ornamental grasses and sedges ranked: C. lanceolata>C. giraldiana>C. epigeios>F. glauca.

Key words: ornamental grass, morphological criteria, physiological index, shade tolerance, subordination function analysis

ZHANG Chao-cheng, JIANG Qian, WU Zhi, HE Xin-jie, JIANG Kai, GAO Jing-ya, LI Xiang, WANG Ning. Studies of the shade-tolerance of four ornamental grass and sedge cultivars[J]. Acta Prataculturae Sinica, 2019, 28(7): 60-72.

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