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Yan Z, Xu D, Yue X, Yuan S, Shi J, Gao L, Wu C, Zuo J, Wang Q. Whole-transcriptome RNA sequencing reveals changes in amino acid metabolism induced in harvested broccoli by red LED irradiation. Food Res Int 2023; 169:112820. [PMID: 37254395 DOI: 10.1016/j.foodres.2023.112820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 03/27/2023] [Accepted: 04/11/2023] [Indexed: 06/01/2023]
Abstract
Whole-transcriptomic profiling combined with amino acid analysis were conducted in order to gain a better understanding of global changes in amino acid metabolism induced in broccoli by red LED irradiation. The results showed that the contents of almost all 16 amino acids in postharvest broccoli were maintained under red LED illumination. The red LED irradiation enhanced the anabolism of amino acid, including the biosynthesis of aromatic amino acids by upregulating the genes' expression in the shikimate pathway, as well as by upregulating the genes' expression which encoding biosynthetic enzymes in the branched-chain amino acid biosynthesis pathway. Red LED irradiation induced the expression of genes encoding aspartate aminotransferase, which plays a role in Asp synthesis, aspartate kinase, which functions in aspartate metabolism, and a cytoplasmic aspartate aminotransferase that converts 2-Oxoglutarate into Glu. Genes encoding imidazole glycerol-phosphate synthase and histidinol-phosphatase, which function in the His biosynthesis pathway, were also upregulated. According to our results, red LED irradiation delays broccoli's yellowing and senescence by regulating amino acid metabolism. These results enhance our understanding of the role of amino acid metabolism in the senescence of broccoli and the mechanism of red LED irradiation to alter amino acid metabolism in harvested broccoli.
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Affiliation(s)
- Zhicheng Yan
- Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-food Processing and Nutrition, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, PR China.
| | - Dongying Xu
- Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-food Processing and Nutrition, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
| | - Xiaozhen Yue
- Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-food Processing and Nutrition, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
| | - Shuzhi Yuan
- Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-food Processing and Nutrition, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Junyan Shi
- Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-food Processing and Nutrition, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Lipu Gao
- Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-food Processing and Nutrition, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Caie Wu
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, PR China
| | - Jinhua Zuo
- Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-food Processing and Nutrition, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
| | - Qing Wang
- Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-food Processing and Nutrition, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
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2
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Yuxiao Z, Guo Y, Xinhua S. Comprehensive insight into an amino acid metabolic network in postharvest horticultural products: a review. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2023. [PMID: 37066732 DOI: 10.1002/jsfa.12638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 04/11/2023] [Accepted: 04/17/2023] [Indexed: 06/19/2023]
Abstract
Amino acid (AA) metabolism plays a vital role in the central metabolism of plants. In addition to protein biosynthesis, AAs are involved in secondary metabolite biosynthesis, signal transduction, stress response, defense against pathogens, flavor formation, and so on. Besides these functions, AAs can be degraded into precursors or intermediates of the tricarboxylic acid cycle to substitute respiratory substrates and restore energy homeostasis, as well as directly acting as signal molecules or be involved in the regulation of plant signals to delay senescence of postharvest horticultural products (PHPs). AA metabolism and its role in plants growth have been clarified; however, only a few studies about their roles exist concerning the postharvest preservation of fruit and vegetables. This study reviews the potential functions of various AAs by comparing the difference in AA metabolism at the postharvest stage and then discusses the crosstalk of AA metabolism and energy metabolism, the target of rapamycin/sucrose nonfermenting-related kinase 1 signaling and secondary metabolism. Finally, the roles and effect mechanism of several exogenous AAs in the preservation of PHPs are highlighted. This review provides a comprehensive insight into the AA metabolism network in PHPs. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Zhang Yuxiao
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zi'bo, China
| | - Yanyin Guo
- School of Agricultural Engineering and Food Science, Shandong University of Technology, Zi'bo, China
| | - Song Xinhua
- College of Life Science, Shandong University of Technology, Zi'bo, China
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3
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Casajús V, Howe K, Fish T, Civello P, Thannhauser T, Li L, Gómez Lobato M, Martínez G. Evidence of glucosinolates translocation from inflorescences to stems during postharvest storage of broccoli. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2023; 195:322-329. [PMID: 36669347 DOI: 10.1016/j.plaphy.2023.01.012] [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: 02/28/2022] [Revised: 12/05/2022] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
Broccoli is a vegetable appreciated by consumers for its nutritional properties, particularly for its high glucosinolate (GLS) content. However, broccoli shows a high rate of senescence during postharvest and the GLS content in inflorescences decreases sharply. Usually, postharvest studies on broccoli focus on inflorescences, ignoring the other tissues harvested such as the stems and main stalk. In this work, GLS metabolism in whole heads of broccoli (including inflorescences, small stems and stalk) was analysed during postharvest senescence. The content of GLS content, expression of GLS metabolic genes, and expression of GLS transport-associated genes were measured in the three parts of harvested broccoli. A marked decrease in the content of all GLSs was detected in inflorescences, but an increase in the stems and stalk. Also, decreased expressions of GLS biosynthesis and degradation genes were detected in all tissues analysed. On the other hand, an increase in the expression of one of the genes involved in GLS transport was observed. These results suggest that GLSs would be transported from inflorescences to stems during postharvest senescence. From a commercial point of view, broccoli stems are usually discarded and not used as food. However, the accumulation of GLSs in the stems is an important factor to consider when contemplating potential commercial use of this part of the plant.
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Affiliation(s)
- Victoria Casajús
- Instituto de Fisiología Vegetal (INFIVE) UNLP-CONICET, 113 and 61, 1900, La Plata, Argentina
| | - Kevin Howe
- Robert W. Holley Center for Agriculture and Health, USDA-Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
| | - Tara Fish
- Robert W. Holley Center for Agriculture and Health, USDA-Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
| | - Pedro Civello
- Instituto de Fisiología Vegetal (INFIVE) UNLP-CONICET, 113 and 61, 1900, La Plata, Argentina; Facultad de Ciencias Exactas. Universidad Nacional de La Plata (UNLP), La Plata, Argentina
| | - Theodore Thannhauser
- Robert W. Holley Center for Agriculture and Health, USDA-Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
| | - Li Li
- Robert W. Holley Center for Agriculture and Health, USDA-Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
| | - María Gómez Lobato
- Instituto de Fisiología Vegetal (INFIVE) UNLP-CONICET, 113 and 61, 1900, La Plata, Argentina
| | - Gustavo Martínez
- Instituto de Fisiología Vegetal (INFIVE) UNLP-CONICET, 113 and 61, 1900, La Plata, Argentina; Facultad de Ciencias Exactas. Universidad Nacional de La Plata (UNLP), La Plata, Argentina.
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4
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Effects of nanocarbon solution treatment on the nutrients and glucosinolate metabolism in broccoli. Food Chem X 2022; 15:100429. [PMID: 36211778 PMCID: PMC9532756 DOI: 10.1016/j.fochx.2022.100429] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 08/07/2022] [Accepted: 08/09/2022] [Indexed: 11/28/2022] Open
Abstract
Nanocarbon application could enhance the total protein in broccoli, directly. 18.75 L·ha−1 nanocarbon solution greatly increase 22.9 % of glucoraphanin. Nanocarbon solution obviously reduces 4 indolic glucosinolate productions. Nanocarbon has great great impact on glucosinolate biosynthesis and pathway.
The effects of a nanocarbon solution on the nutrients, glucosinolate metabolism and glucoraphanin pathway in broccoli were investigated. Significant positive linear relationships were observed between the nanocarbon solution and total protein yield, although effects on the soluble sugars, vitamin C and dry matter production were not observed. All nanocarbon solutions significantly increased the glucoraphanin content (p < 0.05), and the 18.75 L·ha−1 nanocarbon solution maximally increased the glucoraphanin content by 22.9 %. However, these treatments also significantly reduced the contents of glucobrassicin, 4-methoxyglucobrassicin, 4-hydroxyglucobrassicin and neoglucobrassicin. Further research demonstrated that the 18.75 L·ha−1 nanocarbon solution significantly upregulated the MAM1, IPMI2, CYP79F1, FMOgs-ox2, AOP2, and TGG1 expression levels, which directly resulted in the accumulation of glucoraphanin and glucoerucin. This study provides insights into the prospective nanotechnological approaches for developing efficient and environmentally friendly nanocarbon solution for use on crops.
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Seljåsen R, Kusznierewicz B, Bartoszek A, Mølmann J, Vågen IM. Effects of Post-Harvest Elicitor Treatments with Ultrasound, UV- and Photosynthetic Active Radiation on Polyphenols, Glucosinolates and Antioxidant Activity in A Waste Fraction of White Cabbage (Brassica oleracea var. capitata). Molecules 2022; 27:molecules27165256. [PMID: 36014498 PMCID: PMC9414070 DOI: 10.3390/molecules27165256] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/05/2022] [Accepted: 08/09/2022] [Indexed: 11/16/2022] Open
Abstract
Biosynthesis of phytochemicals in leaves of Brassica can be initiated by abiotic factors. The aim of the study was to investigate elicitor treatments to add value to waste of cabbage. A leaf waste fraction from industrial trimming of head cabbage was exposed to UV radiation (250–400 nm, 59 and 99 kJ∙m−2, respectively), photosynthetic active radiation (PAR, 400–700 nm, 497 kJ∙m−2), and ultrasound in water bath (35 kHz, at 15, 30 and 61 kJ∙l−1 water), in order to improve nutraceutical concentration. UV was more effective than PAR to increase the level of flavonols (2 to 3-fold higher) and hydroxycinnamate monosaccharides (1 to 10-fold higher). PAR was three times as effective as UV to increase anthocyanins. Interaction of PAR + UV increased antioxidant activity (30%), the content of five phenolics (1.4 to 10-fold higher), and hydroxycinnamic monosaccharides (compared with PAR or UV alone). Indoles were reduced (40–52%) by UV, but the other glucosinolates (GLS) were unaffected. Ultrasound did not influence any parameters. The results are important for white cabbage by-products by demonstrating that UV + PAR can be successfully used as an effectual tool to increase important phenolics and antioxidant activity of waste fraction leaves without an adverse effect on the main GLS.
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Affiliation(s)
- Randi Seljåsen
- Department of Horticulture, Division of Food Production and Society, Norwegian Institute of Bioeconomy Research (NIBIO), P.O. Box 115, NO-1431 Ås, Norway
- Correspondence: ; Tel.: +47-40622915
| | - Barbara Kusznierewicz
- Department of Chemistry, Technology and Biotechnology of Food, Faculty of Chemistry, Gdansk University of Technology, 11/12 Narutowicza St., 80-233 Gdansk, Poland
| | - Agnieszka Bartoszek
- Department of Chemistry, Technology and Biotechnology of Food, Faculty of Chemistry, Gdansk University of Technology, 11/12 Narutowicza St., 80-233 Gdansk, Poland
| | - Jørgen Mølmann
- Department of Horticulture, Division of Food Production and Society, Norwegian Institute of Bioeconomy Research (NIBIO), P.O. Box 115, NO-1431 Ås, Norway
| | - Ingunn M. Vågen
- Department of Horticulture, Division of Food Production and Society, Norwegian Institute of Bioeconomy Research (NIBIO), P.O. Box 115, NO-1431 Ås, Norway
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6
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Jiang H, Li Y, He R, Tan J, Liu K, Chen Y, Liu H. Effect of Supplemental UV-A Intensity on Growth and Quality of Kale under Red and Blue Light. Int J Mol Sci 2022; 23:ijms23126819. [PMID: 35743261 PMCID: PMC9223683 DOI: 10.3390/ijms23126819] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/10/2022] [Accepted: 06/17/2022] [Indexed: 02/06/2023] Open
Abstract
Different intensities of UV-A (6, 12, 18 μmol·m-2s-1) were applied in a plant factory to evaluate the combined influences of supplemental UV-A and red and blue light (Red:Blue = 1:1 at PPFD of 250 μmol·m-2 s-1) on the biomass, antioxidant activity and phytochemical accumulation of kale. Supplemental UV-A treatments (T1: 6 μmol·m-2 s-1, T2: 12 μmol·m-2 s-1 and T3: 18 μmol·m-2 s-1) resulted in higher moisture content, higher pigment content, and greater leaf area of kale while T2 reached its highest point. T2 treatment positively enhanced the antioxidant capacity, increased the contents of soluble protein, soluble sugar and reduced the nitrate content. T1 treatment markedly increased the content of aliphatic glucosinolate (GSL), whereas T2 treatment highly increased the contents of indolic GSL and total GSL. Genes related to GSL biosynthesis were down-regulated in CK and T3 treatments, while a majority of them were greatly up-regulated by T1 and T2. Hence, supplemental 12 μmol·m-2 s-1 UV-A might be a promising strategy to enhance the growth and quality of kale in a plant factory.
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Lin P, Di H, Ma J, Wang Y, Wei J, Jian Y, Li Z, Xu J, Zheng Y, Li H, Zhang F, Sun B. Packaging With Different Color Bags Under Light Exposure Improves Baby Mustard ( Brassica juncea var. gemmifera) Postharvest Preservation. FRONTIERS IN PLANT SCIENCE 2022; 13:880271. [PMID: 35665158 PMCID: PMC9158537 DOI: 10.3389/fpls.2022.880271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 04/26/2022] [Indexed: 06/15/2023]
Abstract
Effect of packaging baby mustard into bags of different color under light exposure on its visual quality and the content of chlorophyll, carotenoids, and glucosinolates at 20°C was investigated. Packaging with seven color bags under light exposure prolonged the shelf life, especially green (GB), blue (BB), and transparent (TB) bags with holes, and their shelf life was 1.7, 1.6, and 1.6 times that of the control, respectively. The GB and BB treatments delayed the deterioration of the sensory quality in baby mustard during storage. The BB and TB treatments not only increased chlorophyll and carotenoids content in baby mustard during storage but also enhanced the accumulation of glucosinolates by inhibiting their degradation, especially the BB treatment. Overall, the results demonstrate that the BB treatment is a promising technique for maintaining the postharvest quality of baby mustard.
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Affiliation(s)
- Peixing Lin
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Hongmei Di
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Jie Ma
- Bijie Institute of Agricultural Sciences, Bijie, China
| | - Yating Wang
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Jia Wei
- Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Yue Jian
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Zhiqing Li
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Jingyi Xu
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Yangxia Zheng
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Huanxiu Li
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Fen Zhang
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Bo Sun
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
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Perera WPTD, Navaratne SB, Wickramasinghe I. Review on effect of postharvest illumination by fluorescent and ultraviolet light waves on the quality of vegetables. J FOOD PROCESS ENG 2022. [DOI: 10.1111/jfpe.13960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- W. P. T. D. Perera
- Department of Food Science and Technology, Faculty of Applied Sciences University of Sri Jayewardenepura Nugegoda Sri Lanka
| | - S. B. Navaratne
- Department of Food Science and Technology, Faculty of Applied Sciences University of Sri Jayewardenepura Nugegoda Sri Lanka
| | - I. Wickramasinghe
- Department of Food Science and Technology, Faculty of Applied Sciences University of Sri Jayewardenepura Nugegoda Sri Lanka
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Lin P, Di H, Li Z, Wang Y, Zhou W, Huang S, Zhang C, Li H, Zhang F, Sun B. Light irradiation maintains the sensory quality, health-promoting phytochemicals, and antioxidant capacity of post-harvest baby mustard. J Food Sci 2021; 87:112-123. [PMID: 34859430 DOI: 10.1111/1750-3841.15980] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/29/2021] [Accepted: 10/18/2021] [Indexed: 02/05/2023]
Abstract
The ability of white, red, and blue irradiation to maintain sensory quality, health-promoting compounds, and antioxidant capacity, and regulate glucosinolate metabolism-related gene expression in post-harvest baby mustard was studied. Irradiation with 80 µmol m-2 s-1 extended the shelf life of post-harvest baby mustard. Irradiation delayed the increase in weight loss and the decrease in sensory parameter scores and the levels of ascorbic acid, total phenolics, glucosinolate, and antioxidant capacity during storage of baby mustard. Irradiation induced the expression of glucosinolate biosynthesis genes and inhibited glucosinolate degradation gene expression. The glucosinolate content and glucosinolate metabolism-related gene expression in post-harvest baby mustard were higher under white and red light irradiation compared with blue light irradiation. These findings indicate that irradiation (80 µmol m-2 s-1 ), especially of white and red light, is an effective technique for maintaining the sensory and nutritional qualities in post-harvest baby mustard stored at 20°C. PRACTICAL APPLICATION: This study was to evaluate the effect of white, red, and blue irradiation on the sensory quality, health-promoting compounds, antioxidant capacity, and glucosinolate metabolism-related gene expression of baby mustard during post-harvest storage, providing an effective and sustainable post-harvest method to extend shelf life and maintain the post-harvest quality of baby mustard under ambient temperature storage. Irradiation (80 µmol m-2 s-1 ), especially of white and red light, is an effective technique for maintaining the sensory and nutritional qualities in post-harvest baby mustard stored at 20°C.
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Affiliation(s)
- Peixing Lin
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Hongmei Di
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Zhiqing Li
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Yating Wang
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Wenting Zhou
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Shuya Huang
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Chenlu Zhang
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Huanxiu Li
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Fen Zhang
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
| | - Bo Sun
- College of Horticulture, Sichuan Agricultural University, Chengdu, China
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The Effect of Photoperiod on Necrosis Development, Photosynthetic Efficiency and 'Green Islands' Formation in Brassica juncea Infected with Alternaria brassicicola. Int J Mol Sci 2021; 22:ijms22168435. [PMID: 34445145 PMCID: PMC8395102 DOI: 10.3390/ijms22168435] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 07/30/2021] [Accepted: 08/02/2021] [Indexed: 01/06/2023] Open
Abstract
The main goal of growing plants under various photoperiods is to optimize photosynthesis for using the effect of day length that often acts on plants in combination with biotic and/or abiotic stresses. In this study, Brassica juncea plants were grown under four different day-length regimes, namely., 8 h day/16 h night, 12 h day/12 h night, 16 h day/8 h night, and continuous light, and were infected with a necrotrophic fungus Alternaria brassicicola. The development of necroses on B. juncea leaves was strongly influenced by leaf position and day length. The largest necroses were formed on plants grown under a 16 h day/8 h night photoperiod at 72 h post-inoculation (hpi). The implemented day-length regimes had a great impact on leaf morphology in response to A. brassicicola infection. They also influenced the chlorophyll and carotenoid contents and photosynthesis efficiency. Both the 1st (the oldest) and 3rd infected leaves showed significantly higher minimal fluorescence (F0) compared to the control leaves. Significantly lower values of other investigated chlorophyll a fluorescence parameters, e.g., maximum quantum yield of photosystem II (Fv/Fm) and non-photochemical quenching (NPQ), were observed in both infected leaves compared to the control, especially at 72 hpi. The oldest infected leaf, of approximately 30% of the B. juncea plants, grown under long-day and continuous light conditions showed a ‘green island’ phenotype in the form of a green ring surrounding an area of necrosis at 48 hpi. This phenomenon was also reflected in changes in the chloroplast’s ultrastructure and accelerated senescence (yellowing) in the form of expanding chlorosis. Further research should investigate the mechanism and physiological aspects of ‘green islands’ formation in this pathosystem.
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