|
1
|
Liu M, Ma L, Tang Y, Yang W, Yang Y, Xi J, Wang X, Zhu W, Xue J, Zhang X, Xu S. Maize Autophagy-Related Protein ZmATG3 Confers Tolerance to Multiple Abiotic Stresses. PLANTS (BASEL, SWITZERLAND) 2024; 13:1637. [PMID: 38931070 PMCID: PMC11207562 DOI: 10.3390/plants13121637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 06/05/2024] [Accepted: 06/11/2024] [Indexed: 06/28/2024]
Abstract
Abiotic stresses pose a major increasing problem for the cultivation of maize. Autophagy plays a vital role in recycling and re-utilizing nutrients and adapting to stress. However, the role of autophagy in the response to abiotic stress in maize has not yet been investigated. Here, ZmATG3, which is essential for ATG8-PE conjugation, was isolated from the maize inbred line B73. The ATG3 sequence was conserved, including the C-terminal domains with HPC and FLKF motifs and the catalytic domain in different species. The promoter of the ZmATG3 gene contained a number of elements involved in responses to environmental stresses or hormones. Heterologous expression of ZmATG3 in yeast promoted the growth of strain under salt, mannitol, and low-nitrogen stress. The expression of ZmATG3 could be altered by various types of abiotic stress (200 mM NaCl, 200 mM mannitol, low N) and exogenous hormones (500 µM ABA). GUS staining analysis of ZmATG3-GUS transgenic Arabidopsis revealed that GUS gene activity increased after abiotic treatment. ZmATG3-overexpressing Arabidopsis plants had higher osmotic and salinity stress tolerance than wild-type plants. Overexpression of ZmATG3 up-regulated the expression of other AtATGs (AtATG3, AtATG5, and AtATG8b) under NaCl, mannitol and LN stress. These findings demonstrate that overexpression of ZmATG3 can improve tolerance to multiple abiotic stresses.
Collapse
Affiliation(s)
- Mengli Liu
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Li Ma
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Yao Tang
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Wangjin Yang
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Yuyin Yang
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Jing Xi
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Xuan Wang
- Yangling Qinfeng Seed-Industry Co., Ltd., Yangling 712100, China;
| | - Wanchao Zhu
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Jiquan Xue
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Xinghua Zhang
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| | - Shutu Xu
- Key Laboratory of Biology and Genetic Breeding of Maize in Arid Area of Northwest Region, College of Agronomy, Northwest A&F University, Yangling 712100, China; (M.L.); (L.M.); (Y.T.); (W.Y.); (Y.Y.); (J.X.); (W.Z.); (J.X.)
| |
Collapse
|
|
2
|
Huang W, Ma D, Xia L, Zhang E, Wang P, Wang M, Guo F, Wang Y, Ni D, Zhao H. Overexpression of CsATG3a improves tolerance to nitrogen deficiency and increases nitrogen use efficiency in arabidopsis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2023; 196:328-338. [PMID: 36739840 DOI: 10.1016/j.plaphy.2023.01.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 01/09/2023] [Accepted: 01/28/2023] [Indexed: 06/18/2023]
Abstract
Nitrogen (N) is a major nutrition element for tea plant. However, application of high levels of N negatively causes environmental problems. Therefore, improved N use efficiency (NUE) of tea plant will be highly desirable and crucial for sustainable tea cultivation. Autophagy plays a central role in N recycling and holds potential to improve N utilization, and many AuTophaGy-related genes (ATGs) are involved in the autophagy process. Here, CsATG3a was identified from Camellia sinensis, and the functions involved in N utilization was characterized in arabidopsis (Arabidopsis thaliana). The transcript level of CsATG3a in tea leaves increases with their maturity. Relative to the wild type (WT) arabidopsis, two CsATG3a-overexpressing (CsATG3a-OE) lines exhibited improved vegetative growth, delayed reproductive stage, and upregulated expression of AtATGs (AtATG3, AtATG5 and AtATG8b) in a low N (LN) hydroponic condition. The expression levels of AtNRT1.1, AtNRT2.1, AtNRT2.2, AtAMT1.1 and AtAMT1.3 for N uptake and transport in roots were all significantly higher in CsATG3a-OE lines compared with those in the WT under LN. Meanwhile, the overexpression of CsATG3a in arabidopsis also increased N and dry matter allocation into both rosette leaves and roots under LN. Additionally, compared with WT, improved HI (harvest index), NHI (N harvest index), NUtE (N utilization efficiency) and NUE (N use efficiency) of CsATG3a-OE lines were further confirmed in a low-N soil cultured experiment. Together, these results concluded that CsATG3a is involved in N recycling and enhances tolerance to LN, indicating that CsATG3a holds potential promise to improve NUE in tea plant.
Collapse
Affiliation(s)
- Wei Huang
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Danni Ma
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Li Xia
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - E Zhang
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Pu Wang
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Mingle Wang
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Fei Guo
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Yu Wang
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China.
| | - Dejiang Ni
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Hua Zhao
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, PR China; College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, PR China.
| |
Collapse
|
|
3
|
da Silva Pereira P, de Almeida Gonçalves L, da Silva MJ, Rezende MH. Extrafloral nectaries of four varieties of Chamaecrista ramosa (Vogel) H.S.Irwin & Barneby (Fabaceae): anatomy, chemical nature, mechanisms of nectar secretion, and elimination. PROTOPLASMA 2018; 255:1635-1647. [PMID: 29704049 DOI: 10.1007/s00709-018-1253-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Accepted: 04/09/2018] [Indexed: 06/08/2023]
Abstract
Considering the importance of extrafloral nectaries (EFNs) in Fabaceae, the objectives of this research were to analyze (1) the anatomical and histochemical characteristics of the EFNs of Chamaecrista ramosa var. ramosa, C. ramosa var. curvifoliola, C. ramosa var. parvifoliola, and C. ramosa var. lucida and (2) the ultrastructure of the EFNs of C. ramosa var. ramosa. Standard techniques in plant anatomy and transmission electron microscopy were used. The anatomical analyses confirmed the characteristics described for extrafloral nectaries, evidencing three well-defined regions: epidermis, nectariferous, and subnectariferous parenchymas. Carbohydrates, proteins, pectins/mucilages, and lipids were detected by histochemical analyzes in all varieties. The ultrastructure of the EFNs of C. ramosa var. ramosa allowed the observation of microchannels at the external periclinal cell walls of the epidermis covering the secretory region. The nectariferous and subnectariferous parenchyma cells have periplasmic spaces, large plastids containing starch grains and plastoglobules, mitochondria, developed endoplasmic reticulum, large vacuoles with electron-dense contents, and membrane residues may be associated with the vacuole, suggesting the occurrence of autophagic processes. The anatomical, histochemical, and ultrastructural patterns revealed characteristics that confirm the glands of C. ramosa as extrafloral nectaries and suggest the eccrine mechanism of secretion.
Collapse
Affiliation(s)
- Priscila da Silva Pereira
- Pós-graduação em Biodiversidade Vegetal, Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Avenida Esperança, S/N, Campus Samambaia, ICB - 1, 2nd floor, room 206, Goiânia, 74690-900, Brazil.
| | - Letícia de Almeida Gonçalves
- Pós-graduação em Biodiversidade Vegetal, Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Avenida Esperança, S/N, Campus Samambaia, ICB - 1, 2nd floor, room 206, Goiânia, 74690-900, Brazil
| | - Marcos José da Silva
- Pós-graduação em Biodiversidade Vegetal, Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Avenida Esperança, S/N, Campus Samambaia, ICB - 1, 1st floor, room 114A, Goiânia, 74690-900, Brazil
| | - Maria Helena Rezende
- Pós-graduação em Biodiversidade Vegetal, Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Avenida Esperança, S/N, Campus Samambaia, ICB - 1, 2nd floor, room 206, Goiânia, 74690-900, Brazil
| |
Collapse
|
|
4
|
Guimarães E, Nogueira A, Machado SR. Floral nectar production and nectary structure of a bee-pollinated shrub from Neotropical savanna. PLANT BIOLOGY (STUTTGART, GERMANY) 2016; 18:26-36. [PMID: 26194742 DOI: 10.1111/plb.12370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 07/15/2015] [Indexed: 05/09/2023]
Abstract
Biotic pollination is critical for tropical ecosystem functioning, and nectar plays an essential role as it represents the main trophic resource for pollinators. Nevertheless, little is known about the mechanisms that underlie its production, which is essential for understanding the basis of nectar-mediated interactions in ecological and evolutionary approaches. Therefore, this study explores the relationship between the nectar secretion pattern and nectary functional changes in Anemopaegma album, a bee-pollinated species. We analysed the pattern of nectar production under field conditions and investigated floral nectary structural changes in two different developmental stages using light, transmission and scanning electron microscopy. We measured 30.95 ± 23.02 μl (mean ± SD, n = 30) of nectar accumulated inside the nectar chamber (29.26 ± 3.48% sucrose equivalents) at the moment of flower opening. Nectar removal did not influence the pattern of floral nectar production in terms of volume or total sugar but reduced the concentration of the nectar produced during the first 24 h of anthesis. The nectary consisted of an epidermis, a nectary parenchyma and a subnectary parenchyma supplied only by phloem. Starch grains decreased in size and abundance from the subnectary parenchyma toward the epidermis. We observed the degradation of starch grains and incorporation of amyloplasts into vacuoles at the pre-anthesis stage as well as the transformation of amyloplasts into elaioplasts during anthesis. Nectar secretion was continuous during the A. album flower life span, which was related to the functional features of its floral nectary, especially the presence of starch stored in the parenchyma.
Collapse
Affiliation(s)
- E Guimarães
- Departamento de Botânica, UNESP - Universidade Estadual Paulista, Botucatu, Brazil
| | - A Nogueira
- Departamento de Botânica, Universidade de São Paulo, Instituto de Biociências, São Paulo, Brazil
| | - S R Machado
- Departamento de Botânica, UNESP - Universidade Estadual Paulista, Botucatu, Brazil
| |
Collapse
|