1
|
Hu S, Chen Y, Qian C, Ren H, Liang X, Tao W, Chen Y, Wang J, Dong Y, Han J, Ouyang X, Huang X. Nuclear accumulation of rice UV-B photoreceptors is UV-B- and OsCOP1-independent for UV-B responses. Nat Commun 2024; 15:6396. [PMID: 39080288 PMCID: PMC11289442 DOI: 10.1038/s41467-024-50755-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 07/18/2024] [Indexed: 08/02/2024] Open
Abstract
In plants, the conserved plant-specific photoreceptor UV RESISTANCE LOCUS 8 (UVR8) perceives ultraviolet-B (UV-B) light and mediates UV-B-induced photomorphogenesis and stress acclimation. In this study, we reveal that UV-B light treatment shortens seedlings, increases stem thickness, and enhances UV-B stress tolerance in rice (Oryza sativa) via its two UV-B photoreceptors OsUVR8a and OsUVR8b. Although the rice and Arabidopsis (Arabidopsis thaliana) UVR8 (AtUVR8) photoreceptors all form monomers in response to UV-B light, OsUVR8a, and OsUVR8b function is only partially conserved with respect to AtUVR8 in UV-B-induced photomorphogenesis and stress acclimation. UV-B light and CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) promote the nuclear accumulation of AtUVR8; by contrast, OsUVR8a and OsUVR8b constitutively localize to the nucleus via their own nuclear localization signals, independently of UV-B light and the RING-finger mutation of OsCOP1. We show that OsCOP1 negatively regulates UV-B responses, and shows weak interaction with OsUVR8s, which is ascribed to the N terminus of OsCOP1, which is conserved in several monocots. Furthermore, transcriptome analysis demonstrates that UV-B-responsive gene expression differs globally between Arabidopsis and rice, illuminating the evolutionary divergence of UV-B light signaling pathways between monocot and dicot plants.
Collapse
Affiliation(s)
- Shan Hu
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Yihan Chen
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Chongzhen Qian
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Hui Ren
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Xinwen Liang
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Wenjing Tao
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Yanling Chen
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Jue Wang
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Yuan Dong
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Jiupan Han
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China
| | - Xinhao Ouyang
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China.
| | - Xi Huang
- State Key Laboratory of Cellular Stress Biology, Xiamen Key Laboratory of Plant Genetics, Faculty of Medicine and Life Sciences, School of Life Sciences, Xiamen University, Xiamen, China.
| |
Collapse
|
2
|
Chen YL, Zhong YB, Leung DWM, Yan XY, Ouyang MN, Ye YZ, Li SM, Peng XX, Liu EE. OsUVR8b, rather than OsUVR8a, plays a predominant role in rice UVR8-mediated UV-B response. PHYSIOLOGIA PLANTARUM 2024; 176:e14471. [PMID: 39129657 DOI: 10.1111/ppl.14471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 06/30/2024] [Accepted: 07/16/2024] [Indexed: 08/13/2024]
Abstract
UV RESISTANCE LOCUS 8 (UVR8) has been identified in Arabidopsis thaliana as the receptor mediating responses to UV-B radiation. However, UVR8-mediated UV-B signaling pathways in rice, which possesses two proteins (UVR8a and UVR8b) with high identities to AtUVR8, remain largely unknown. Here, UVR8a/b were found to be predominantly expressed in rice leaves and leaf sheaths, while the levels of UVR8b transcript and UVR8b protein were both higher than those of UVR8a. Compared to wild-type (WT) plants, uvr8b and uvr8a uvr8b rice mutants exposed to UV-B showed reduced UV-B-induced growth inhibition and upregulation of CHS and HY5 transcripts alongside UV-B acclimation. However, uvr8a mutant was similar to WT plants and exhibited changes comparable with WT. Overexpressing OsUVR8a/b enhanced UV-B-induced growth inhibition and acclimation to UV-B. UV-B was able to enhance the interaction between E3 ubiquitin ligase OsCOP1 and OsUVR8a/b, whereas the interaction of the homologous protein of Arabidopsis REPRESSOR OF UV-B PHOTOMORPHOGENESIS2 (AtRUP2) in rice with OsUVR8a/b was independent of UV-B. Additionally, OsUVR8a/b proteins were also found in the nucleus and cytoplasm even in the absence of UV-B. The abundance of OsUVR8 monomer showed an invisible change in the leaves of rice seedlings transferred from white light to that supplemented with UV-B, even though UV-B was able to weaken the interactions between OsUVR8a and OsUVR8b homo and heterodimers. Therefore, both OsUVR8a and OsUVR8b, which have different localization and response patterns compared with AtUVR8, function in the response of rice to UV-B radiation, whereas OsUVR8b plays a predominant role in this process.
Collapse
Affiliation(s)
- Yu-Long Chen
- College of Life Sciences, South China Agricultural University, Guangzhou, P.R. China
| | - You-Bin Zhong
- College of Life Sciences, South China Agricultural University, Guangzhou, P.R. China
| | - David W M Leung
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - Xiao-Yu Yan
- College of Life Sciences, South China Agricultural University, Guangzhou, P.R. China
| | - Meng-Ni Ouyang
- College of Life Sciences, South China Agricultural University, Guangzhou, P.R. China
| | - Yu-Zhen Ye
- College of Life Sciences, South China Agricultural University, Guangzhou, P.R. China
| | - Shi-Mei Li
- College of Life Sciences, South China Agricultural University, Guangzhou, P.R. China
| | - Xin-Xiang Peng
- College of Life Sciences, South China Agricultural University, Guangzhou, P.R. China
| | - E-E Liu
- College of Life Sciences, South China Agricultural University, Guangzhou, P.R. China
| |
Collapse
|
3
|
Mathur S, Bheemanahalli R, Jumaa SH, Kakar N, Reddy VR, Gao W, Reddy KR. Impact of ultraviolet-B radiation on early-season morpho-physiological traits of indica and japonica rice genotypes. FRONTIERS IN PLANT SCIENCE 2024; 15:1369397. [PMID: 38495369 PMCID: PMC10941760 DOI: 10.3389/fpls.2024.1369397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 02/12/2024] [Indexed: 03/19/2024]
Abstract
Ultraviolet (UV)-B radiation is considered one of the major detrimental rays coming from the Sun. UV-B radiation has a harmful impact on plant growth and development. The effect of UV-B radiation was studied on 64 rice (Oryza sativa L.) genotypes during the vegetative season. An equal number of genotypes from the japonica (50%) and indica (50%) subspecies were phenotyped using the Soil-Plant-Atmosphere-Research (SPAR) units. The 10 kJ UV-B was imposed 12 days after planting (DAP) and continued for three weeks (21 d). Based on the combined ultraviolet-B radiation response index (CUVBRI) for each genotype, the 64 rice genotypes were classified into sensitive, moderately sensitive, moderately tolerant, and tolerant. Various shoot traits, such as plant height, tiller, and leaf numbers, were measured. We also studied critical root phenological traits like root volume, diameter, tips, and forks. Out of all the studied shoot traits, leaf area showed maximum reduction for both indica (54%) and japonica (48%). Among the root traits, root length decreased by negligible (1%) for indica as compared to japonica (5%), while root crossing and forks showed a maximum decline for japonica (37 and 42%), respectively. This study is timely, meaningful, and required because it will help breeders select a tolerant or sensitive rice line for better yield and production under abiotic stresses.
Collapse
Affiliation(s)
- Sonal Mathur
- Adaptive Cropping Systems Laboratory, United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Beltsville, MD, United States
| | - Raju Bheemanahalli
- Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, Starkville, MS, United States
| | - Salah Hameed Jumaa
- Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, Starkville, MS, United States
| | - Naqeebullah Kakar
- Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, Starkville, MS, United States
| | - Vangimalla R. Reddy
- Adaptive Cropping Systems Laboratory, United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Beltsville, MD, United States
| | - Wei Gao
- United States Department of Agriculture (USDA) UVB Monitoring and Research Program, Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO, United States
| | - Kambham Raja Reddy
- Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, Starkville, MS, United States
| |
Collapse
|
4
|
Effects and Mechanism of Enhanced UV-B Radiation on the Flag Leaf Angle of Rice. Int J Mol Sci 2022; 23:ijms232112776. [PMID: 36361567 PMCID: PMC9654109 DOI: 10.3390/ijms232112776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/20/2022] [Accepted: 10/21/2022] [Indexed: 11/25/2022] Open
Abstract
Leaf angle is an influential agricultural trait that influences rice (Oryza sativa L.) plant type and yield, which results from the leaf bending from the vertical axis to the abaxial axis. UV-B radiation affects plant morphology, but the effects of varying UV-B intensities on rice flag leaves and the underlying molecular, cellular, and physiological mechanisms remain unknown. This experiment aims to examine the effect of natural light and field-enhanced UV-B radiation (2.5, 5.0, 7.5 kJ·m−2) on the leaf angle of the traditional rice variety Baijiaolaojing on Yuanyang terraces. In comparison with natural light, the content of brassinolide and gibberellin in rice flag leaves increased by 29.94% and 60.1%, respectively. The auxin content decreased by 17.3%. Compared with the natural light treatment, the cellulose content in the pulvini was reduced by 13.8% and hemicellulose content by 25.7% under 7.5 kJ·m−2 radiation intensity. The thick-walled cell area and vascular bundle area of the leaf pulvini decreased with increasing radiation intensity, and the growth of mechanical tissue in the rice leaf pulvini was inhibited. The flag leaf angle of rice was greatest at 7.5 kJ·m−2 radiation intensity, with an increase of 50.2%. There are two pathways by which the angle of rice flag leaves is controlled under high-intensity UV-B radiation. The leaf angle regulation genes OsBUL1, OsGSR1, and OsARF19 control hormone levels, whereas the ILA1 gene controls fiber levels. Therefore, as cellulose, hemicellulose, sclerenchyma, and vascular bundles weaken the mechanical support of the pulvini, the angle of the flag leaf increases.
Collapse
|