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| Effects of acid and cadmium stresses on seed germination, seedling growth, and subcellular structure of Paspalum wettsteinii |
| Received:October 17, 2018 |
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| KeyWord:Paspalum wettsteinii;acid stress;heavy metal;seed germination;subcellular structure |
| Author Name | Affiliation | E-mail | | ZHAO Ya-man | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | CHEN Shun-yu | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZHANG Yun | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | JIANG Yun | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | HOU Xiao-long | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Co-innovation Center for Soil and Water Conservation in Red Soil Region of the Cross-straits, Fuzhou 350002, China
Key Laboratory of the State Forestry Administration for Soil and Water Conservation in Southern Red Soil Region, Fuzhou 350002, China | xl.hou@fafu.edu.cn | | CAI Li-ping | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Co-innovation Center for Soil and Water Conservation in Red Soil Region of the Cross-straits, Fuzhou 350002, China
Key Laboratory of the State Forestry Administration for Soil and Water Conservation in Southern Red Soil Region, Fuzhou 350002, China | |
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| Abstract: |
| The species Paspalum wettsteinii is widely grown in acidified and cadmium(Cd) -contaminated soil in Changting Rare Earth Mine, Fujian Province. The species might have special adaptive strategies to acid and Cd stresses. Therefore, an experiment was carried out to evaluate seed germination, seedling growth, and subcellular structure of P. wettsteinii under different stress conditions,namely, acid(pH 5.5, 4.5, and 3.5) and Cd stresses(5, 10, and 20 mg·L-1). The results showed that acid stress promoted seed germination, and the pH 4.5 treatment had a significant growth promoting effect. The pH 3.5 treatment exhibited inhibitory effects on germination potential, germination index, vigor index, root length, bud length, and biomass of P. wettsteinii seedlings, whereas the effects of other acid stress treatments were not significantly different from those of the control(P>0.05). The germination rate, germination potential, and germination index of the seeds under Cd stress were not significantly different from those of the control(P>0.05), and the vigor index, bud length, root length, and biomass decreased significantly with the increase in Cd concentration(P<0.05). Both pH 3.5 and 10 mg·L-1 Cd induced serious damage to the plasmalemma of root tip cells and subcellular structure of buds, resulting in starch granule swelling, fracture, cell organelle disintegration, and cell vacuolation. The results revealed that the seeds of P. wettsteinii are tolerant to acid and Cd stresses, and mild stress could promote seed germination and seedling growth. |
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