Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea Gardens
In conventional tea plantations, a large amount of pruned material returns to the soil surface, putting a high quantity of polyphenols into the soil. The accumulation of active allelochemicals in the tea rhizosphere and subsequent shift in beneficial microbes may be the cause of acidification, soil...
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Frontiers Media S.A.
2020-05-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fpls.2020.00601/full |
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| author | Yasir Arafat Yasir Arafat Israr Ud Din Muhammad Tayyab Muhammad Tayyab Yuhang Jiang Yuhang Jiang Ting Chen Ting Chen Zhaoying Cai Zhaoying Cai Hanyu Zhao Hanyu Zhao Xiangmin Lin Xiangmin Lin Wenxiong Lin Wenxiong Lin Sheng Lin Sheng Lin |
| author_facet | Yasir Arafat Yasir Arafat Israr Ud Din Muhammad Tayyab Muhammad Tayyab Yuhang Jiang Yuhang Jiang Ting Chen Ting Chen Zhaoying Cai Zhaoying Cai Hanyu Zhao Hanyu Zhao Xiangmin Lin Xiangmin Lin Wenxiong Lin Wenxiong Lin Sheng Lin Sheng Lin |
| author_sort | Yasir Arafat |
| collection | DOAJ |
| description | In conventional tea plantations, a large amount of pruned material returns to the soil surface, putting a high quantity of polyphenols into the soil. The accumulation of active allelochemicals in the tea rhizosphere and subsequent shift in beneficial microbes may be the cause of acidification, soil sickness, and regeneration problem, which may be attributed to hindrance of plant growth, development, and low yield in long-term monoculture tea plantation. However, the role of pruning leaf litter in soil sickness under consecutive tea monoculture is unclear. Here, we investigated soil samples taken from conventional tea gardens of different ages (2, 15, and 30 years) and under the effect of regular pruning. Different approaches including liquid chromatography–mass spectrometry (LC-MS) analysis of the leaf litter, metagenomic study of root-associated bacterial communities, and in vitro interaction of polyphenols with selected bacteria were applied to understand the effect of leaf litter-derived polyphenols on the composition and structure of the tea rhizosphere microbial community. Our results indicated that each pruning practice returns a large amount of leaf litter to each tea garden. LC-MS results showed that leaf litter leads to the accumulation of various allelochemicals in the tea rhizosphere, including epigallocatechin gallate, epigallocatechin, epicatechin gallate, catechin, and epicatechin with increasing age of the tea plantation. Meanwhile, in the tea garden grown consecutively for 30 years (30-Y), the phenol oxidase and peroxidase activities increased significantly. Pyrosequencing identified Burkholderia and Pseudomonas as the dominant genera, while plant growth-promoting bacteria, especially Bacillus, Prevotella, and Sphingomonas, were significantly reduced in the long-term tea plantation. The qPCR results of 30-Y soil confirmed that the copy numbers of bacterial genes per gram of the rhizosphere soil were significantly reduced, while that of Pseudomonas increased significantly. In vitro study showed that the growth of catechin-degrading bacteria (e.g., Pseudomonas) increased and plant-promoting bacteria (e.g., Bacillus) decreased significantly with increasing concentration of these allelochemicals. Furthermore, in vitro interaction showed a 0.36-fold decrease in the pH of the broth after 72 h with the catechin degradation. In summary, the increase of Pseudomonas and Burkholderia in the 30-Y garden was found to be associated with the accumulation of catechin substrates. In response to the long-term monoculture of tea, the variable soil pH along with the litter distribution negatively affect the population of plant growth-promoting bacteria (e.g., Sphingomonas, Bacillus, and Prevotella). Current research suggests that the removal of pruned branches from tea gardens can prevent soil sickness and may lead to sustainable tea production. |
| first_indexed | 2024-12-14T22:46:13Z |
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| id | doaj.art-a5eb1eee8c0742a68e3c07b9df5e043f |
| institution | Directory Open Access Journal |
| issn | 1664-462X |
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| last_indexed | 2024-12-14T22:46:13Z |
| publishDate | 2020-05-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Plant Science |
| spelling | doaj.art-a5eb1eee8c0742a68e3c07b9df5e043f2022-12-21T22:44:50ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2020-05-011110.3389/fpls.2020.00601507047Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea GardensYasir Arafat0Yasir Arafat1Israr Ud Din2Muhammad Tayyab3Muhammad Tayyab4Yuhang Jiang5Yuhang Jiang6Ting Chen7Ting Chen8Zhaoying Cai9Zhaoying Cai10Hanyu Zhao11Hanyu Zhao12Xiangmin Lin13Xiangmin Lin14Wenxiong Lin15Wenxiong Lin16Sheng Lin17Sheng Lin18Key Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaInstitute of Biotechnology and Genetic Engineering, The University of Agriculture Peshawar, Peshawar, PakistanKey Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory of Fujian Province for Agroecological Process and Safety Monitoring, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, ChinaKey Laboratory for Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education, College of Crop Sciences, Fujian Agriculture and Forestry University, Fuzhou, ChinaIn conventional tea plantations, a large amount of pruned material returns to the soil surface, putting a high quantity of polyphenols into the soil. The accumulation of active allelochemicals in the tea rhizosphere and subsequent shift in beneficial microbes may be the cause of acidification, soil sickness, and regeneration problem, which may be attributed to hindrance of plant growth, development, and low yield in long-term monoculture tea plantation. However, the role of pruning leaf litter in soil sickness under consecutive tea monoculture is unclear. Here, we investigated soil samples taken from conventional tea gardens of different ages (2, 15, and 30 years) and under the effect of regular pruning. Different approaches including liquid chromatography–mass spectrometry (LC-MS) analysis of the leaf litter, metagenomic study of root-associated bacterial communities, and in vitro interaction of polyphenols with selected bacteria were applied to understand the effect of leaf litter-derived polyphenols on the composition and structure of the tea rhizosphere microbial community. Our results indicated that each pruning practice returns a large amount of leaf litter to each tea garden. LC-MS results showed that leaf litter leads to the accumulation of various allelochemicals in the tea rhizosphere, including epigallocatechin gallate, epigallocatechin, epicatechin gallate, catechin, and epicatechin with increasing age of the tea plantation. Meanwhile, in the tea garden grown consecutively for 30 years (30-Y), the phenol oxidase and peroxidase activities increased significantly. Pyrosequencing identified Burkholderia and Pseudomonas as the dominant genera, while plant growth-promoting bacteria, especially Bacillus, Prevotella, and Sphingomonas, were significantly reduced in the long-term tea plantation. The qPCR results of 30-Y soil confirmed that the copy numbers of bacterial genes per gram of the rhizosphere soil were significantly reduced, while that of Pseudomonas increased significantly. In vitro study showed that the growth of catechin-degrading bacteria (e.g., Pseudomonas) increased and plant-promoting bacteria (e.g., Bacillus) decreased significantly with increasing concentration of these allelochemicals. Furthermore, in vitro interaction showed a 0.36-fold decrease in the pH of the broth after 72 h with the catechin degradation. In summary, the increase of Pseudomonas and Burkholderia in the 30-Y garden was found to be associated with the accumulation of catechin substrates. In response to the long-term monoculture of tea, the variable soil pH along with the litter distribution negatively affect the population of plant growth-promoting bacteria (e.g., Sphingomonas, Bacillus, and Prevotella). Current research suggests that the removal of pruned branches from tea gardens can prevent soil sickness and may lead to sustainable tea production.https://www.frontiersin.org/article/10.3389/fpls.2020.00601/fullindirect allelopathycatechinssoil sicknessmonoculture problemsplant polyphenol |
| spellingShingle | Yasir Arafat Yasir Arafat Israr Ud Din Muhammad Tayyab Muhammad Tayyab Yuhang Jiang Yuhang Jiang Ting Chen Ting Chen Zhaoying Cai Zhaoying Cai Hanyu Zhao Hanyu Zhao Xiangmin Lin Xiangmin Lin Wenxiong Lin Wenxiong Lin Sheng Lin Sheng Lin Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea Gardens Frontiers in Plant Science indirect allelopathy catechins soil sickness monoculture problems plant polyphenol |
| title | Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea Gardens |
| title_full | Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea Gardens |
| title_fullStr | Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea Gardens |
| title_full_unstemmed | Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea Gardens |
| title_short | Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea Gardens |
| title_sort | soil sickness in aged tea plantation is associated with a shift in microbial communities as a result of plant polyphenol accumulation in the tea gardens |
| topic | indirect allelopathy catechins soil sickness monoculture problems plant polyphenol |
| url | https://www.frontiersin.org/article/10.3389/fpls.2020.00601/full |
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