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Effects of cadmium pollution and acid rain on photosynthetic characteristics of different gender Morus alba seedlings *(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2020 01
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Effects of cadmium pollution and acid rain on photosynthetic characteristics of different gender Morus alba seedlings *
MAO Xiaoyu1 LOU Yanxiao1 DAI Chao1 YU Fei1** LIANG Junying2 & L ? Zhiqiang 3
1 College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, China
2 Zhejiang Aerial Forest Fire Protection Station, Hangzhou 310000, China
3 Institute of Sericulture, Zhejiang Academy of Agricultural Sciences Hangzhou 310000, China
cadmium pollution acid deposition dioecious biomass photosynthesis chlorophyll fluorescence

Nowadays, Cadmium(Cd) contamination in the soil and acid deposition are the global environmental problems, and the differential gender response of dioecious species to stress is also an important part of plant stress ecological ecology research. To investigate the physiological characteristics of different gender Morus Alba seedlings when exposed to cadmium and acid rain, we measured growth parameters, photosynthetic capacity, and chlorophyll fluorescence of Qiangsang1(female), Nongsang14(male), and Nongsang12(monoecism) under cadmium stress(Cd, 50 mg/kg), Acid rain(AR, pH 3.0) and their combination(Cd + AR). Our main results are as follows: Under Cd stress, there was a decrease in biomass and net photosynthetic rate(Pn) in each genders when compared to the controls, compared with the control, the total biomass of the males decreased by 23.54%, while the females and the monoecism decreased by 29.43% and 36.38% of the control; what’s more, females and monoecism exhibited a greater decrease than males in photosynthetic rate. Meanwhile, Cd treatment changed the biomass distribution of Morus Alba seedlings, females mainly reduced the stem biomass while males and monoecism principally reduced root and stem biomass, compared with the control, the stem biomass of females decreased by 37.45%, but the root and leaf biomass decreased by 7.72% and 9.71%; while the leaf biomass of male and monoecism decreased 9.17% and 5.28% of the control. Besides, the decreases in Pn of three genders of Morus Alba seedlings were caused by the decreases of stomatal conductance(gs) and the effective quantum yield of PSⅡ(ΦPSII), under Cd treatment and compound treatment, the gs of females decreased by 47.39% and 57.82%, and ΦPSII decreased by 21.59% and 18.49%; and the gs of monoecism decreased by 46.57% and 58.88%, and ΦPSII w ere also reduced by 26.63% and 19.81% compared with the control. What’s more, when compared to the treatment of Cd, decreases of leaf biomass and Pn in females and monoecism were intensified by acid rain, but the same situation did not happen to males. Therefore, our results indicated that Cd inhibitted biomass accumulation of Morus Alba seedlings by reducing photosynthetic capacity, and the effect of Cd on males was less than that of females and monoecism, furthermore, the decline in photosynthetic capacity is caused by both stomata and non-stomatal factors.




Last Update: 2019-07-04