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Xie X, Zhang Z, Zhao Z, Xie Y, Li H, Ma X, Liu YG, Chen L. The mitochondrial aldehyde dehydrogenase OsALDH2b negatively regulates tapetum degeneration in rice. J Exp Bot 2020; 71:2551-2560. [PMID: 31989154 PMCID: PMC7210758 DOI: 10.1093/jxb/eraa045] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 01/26/2020] [Indexed: 05/02/2023]
Abstract
Timely degradation of anther tapetal cells is a prerequisite for normal pollen development in flowering plants. Although several genes involved in tapetum development have been identified, the molecular basis of tapetum degeneration regulation remains poorly understood. In this study, we identified and characterized the nucleus-encoded, conserved mitochondrial aldehyde dehydrogenase OsALDH2b as a key regulator of tapetum degeneration in rice (Oryza sativa). OsALDH2b was highly expressed in anthers from meiosis to the early microspore stage. Mutation of OsALDH2b resulted in excess malonaldehyde accumulation and earlier programmed cell death in the tapetum, leading to premature tapetum degeneration and abnormal microspore development. These results demonstrate that OsALDH2b negatively regulates tapetal programmed cell death and is required for male reproductive development, providing insights into the regulation of tapetum development in plants.
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Affiliation(s)
- Xianrong Xie
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
| | - Zixu Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
- Key Laboratory of Plant Functional Genomics and Biotechnology of Guangdong Provincial Higher Education Institutions, South China Agricultural University, Guangzhou, China
| | - Zhe Zhao
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
- Key Laboratory of Plant Functional Genomics and Biotechnology of Guangdong Provincial Higher Education Institutions, South China Agricultural University, Guangzhou, China
| | - Yongyao Xie
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
- Key Laboratory of Plant Functional Genomics and Biotechnology of Guangdong Provincial Higher Education Institutions, South China Agricultural University, Guangzhou, China
| | - Heying Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
| | - Xingliang Ma
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
| | - Yao-Guang Liu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
| | - Letian Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
- College of Life Sciences, South China Agricultural University, Guangzhou, China
- Key Laboratory of Plant Functional Genomics and Biotechnology of Guangdong Provincial Higher Education Institutions, South China Agricultural University, Guangzhou, China
- Correspondence:
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Abstract
Plant reproductive development is more sensitive than vegetative growth to many environmental stresses. High temperature (HT) injury is becoming an increasingly serious problem due to recent global warming. In wheat, barley, and other crops, the early phase of anther development is most susceptible to HT. I and my colleagues recently demonstrated that HT causes cell proliferation arrest and represses auxin signaling in a tissue-specific manner in the anther cells of barley and Arabidopsis. HT also caused comprehensive alterations in transcription. The application of auxin at the same time blocked the transcriptional alterations, led to the production of normal pollen grains, and restored the normal seed setting rate under increasing temperatures. Although synthetic auxins have been used widely as potent and selective herbicides, these recent results indicate that auxin is useful for the promotion of fertility and maintenance of crop yields under the threat of global warming.
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Affiliation(s)
- Atsushi Higashitani
- *Correspondence: Atsushi Higashitani, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan. e-mail:
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