Ecological adaptation of Syzygium hancei seedlings in Guangxi under different habitats

Subjects: Biology >> Botany >> Applied botany submitted time 2024-02-07 Cooperative journals: 《广西植物》

ZHAO Xiaoyu ZHAO Lijun ZHU Liqiong MO Ruoguo WANG Yanling

Abstract： In order to understand the adaptation ability of Syzygium hancei seedlings to environmental factors in three different habitats under natural regeneration conditions. The present study collected the current year’s S. hancei seedlings as experimental materials that regenerated in naturally coastal environments of Guangxi, and then antioxidant enzyme activities, soluble sugar content, malondialdehyde content and photosynthetic pigments in leaves and roots were analysed. The results were as follows: (1) Variance analysis (ANOVA) was conducted on multiple environmental factors, which indicated light intensity was highly significant differences, soil surface temperature and water content were not significant differences between the three sample plots. (2) Various light density resulted in the changes of leaves and roots physiological characteristics of seedlings in different habitats. With the light density increasing, leaves’ superoxide dismutase (SOD) activity, soluble sugar (SS), malondialdehyde (MDA), and chlorophyll a/b contents, and roots’ peroxidase (POD) activity of seedlings were significantly higher in habitat B than in habitat A; while leaves’ POD activity, chlorophyll a , chlorophyll b and total chlorophyll contents, and roots’ SOD activity, SS and MDA contents were higher in habitat A than in habitat B. (3) With light intensity decreasing, seedlings that regenerated in habitat B represented significantly higher SOD activity and MDA content in leaves, and POD activity in roots than regenerated in habitat A; however, these seedlings that regenerated in habitat A represented significantly higher POD activity and SS content in leaves compare with regenerated in Habitat B; chlorophyll a , chlorophyll b, total chlorophyll,and SS contents, and roots’ MDA content were significantly higher in habitat A than in habitat B firstly, and then changed to Habitat B being significantly higher than Habitat A; chlorophyll a/b content and roots’ SOD activity were significantly higher in Habitat A firstly and then changed to Habitat A being significantly higher than Habitat B. (4) Comprehensive analyses show that the physiological and biochemical characteristics of all three habitats show different adaptation abilities, in the meanwhile, photoinhibition occurrs in habitat B that is with the lowest canopy density, hence, some manual adjusting practices are need to create a moderate light environment, and provide a suitable condition for promoting the natural regeneration of seedlings.

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