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Lemonnier P, Lawson T. Calvin cycle and guard cell metabolism impact stomatal function. Semin Cell Dev Biol 2024; 155:59-70. [PMID: 36894379 DOI: 10.1016/j.semcdb.2023.03.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 03/01/2023] [Accepted: 03/01/2023] [Indexed: 03/09/2023]
Abstract
Stomatal conductance (gs) determines CO2 uptake for photosynthesis (A) and water loss through transpiration, which is essential for evaporative cooling and maintenance of optimal leaf temperature as well as nutrient uptake. Stomata adjust their aperture to maintain an appropriate balance between CO2 uptake and water loss and are therefore critical to overall plant water status and productivity. Although there is considerable knowledge regarding guard cell (GC) osmoregulation (which drives differences in GC volume and therefore stomatal opening and closing), as well as the various signal transduction pathways that enable GCs to sense and respond to different environmental stimuli, little is known about the signals that coordinate mesophyll demands for CO2. Furthermore, chloroplasts are a key feature in GCs of many species, however, their role in stomatal function is unclear and a subject of debate. In this review we explore the current evidence regarding the role of these organelles in stomatal behaviour, including GC electron transport and Calvin-Benson-Bassham (CBB) cycle activity as well as their possible involvement correlating gs and A along with other potential mesophyll signals. We also examine the roles of other GC metabolic processes in stomatal function.
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Affiliation(s)
- P Lemonnier
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK
| | - T Lawson
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK.
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2
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Westgeest AJ, Dauzat M, Simonneau T, Pantin F. Leaf starch metabolism sets the phase of stomatal rhythm. THE PLANT CELL 2023; 35:3444-3469. [PMID: 37260348 PMCID: PMC10473205 DOI: 10.1093/plcell/koad158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 04/25/2023] [Accepted: 05/15/2023] [Indexed: 06/02/2023]
Abstract
In leaves of C3 and C4 plants, stomata open during the day to favor CO2 entry for photosynthesis and close at night to prevent inefficient transpiration of water vapor. The circadian clock paces rhythmic stomatal movements throughout the diel (24-h) cycle. Leaf transitory starch is also thought to regulate the diel stomatal movements, yet the underlying mechanisms across time (key moments) and space (relevant leaf tissues) remain elusive. Here, we developed PhenoLeaks, a pipeline to analyze the diel dynamics of transpiration, and used it to screen a series of Arabidopsis (Arabidopsis thaliana) mutants impaired in starch metabolism. We detected a sinusoidal, endogenous rhythm of transpiration that overarches days and nights. We determined that a number of severe mutations in starch metabolism affect the endogenous rhythm through a phase shift, resulting in delayed stomatal movements throughout the daytime and diminished stomatal preopening during the night. Nevertheless, analysis of tissue-specific mutations revealed that neither guard-cell nor mesophyll-cell starch metabolisms are strictly required for normal diel patterns of transpiration. We propose that leaf starch influences the timing of transpiration rhythm through an interplay between the circadian clock and sugars across tissues, while the energetic effect of starch-derived sugars is usually nonlimiting for endogenous stomatal movements.
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Affiliation(s)
| | - Myriam Dauzat
- LEPSE, Univ Montpellier, INRAE, Institut Agro, Montpellier, France
| | | | - Florent Pantin
- LEPSE, Univ Montpellier, INRAE, Institut Agro, Montpellier, France
- Univ Angers, Institut Agro, INRAE, IRHS, SFR QUASAV, Angers F-49000, France
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3
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Kelly G, Yaaran A, Gal A, Egbaria A, Brandsma D, Belausov E, Wolf D, David-Schwartz R, Granot D, Eyal Y, Carmi N, Sade N. Guard cell activity of PIF4 and HY5 control transpiration. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2023; 328:111583. [PMID: 36608874 DOI: 10.1016/j.plantsci.2022.111583] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 12/30/2022] [Accepted: 12/31/2022] [Indexed: 06/17/2023]
Abstract
Whole-plant transpiration, controlled by plant hydraulics and stomatal movement, is regulated by endogenous and environmental signals, with the light playing a dominant role. Stomatal pore size continuously adjusts to changes in light intensity and quality to ensure optimal CO2 intake for photosynthesis on the one hand, together with minimal water loss on the other. The link between light and transpiration is well established, but the genetic knowledge of how guard cells perceive those signals to affect stomatal conductance is still somewhat limited. In the current study, we evaluated the role of two central light-responsive transcription factors; a bZIP-family transcription factor ELONGATED HYPOCOTYL5 (HY5) and the basic helix-loop-helix (BHLH) transcription factor PHYTOCHROME INTERACTING FACTOR4 (PIF4), in the regulation of steady-state transpiration. We show that overexpression of PIF4 exclusively in guard cells (GCPIF4) decreases transpiration, and can restrain the high transpiration of the pif4 mutant. Expression of HY5 specifically in guard cells (GCHY5) had the opposite effect of enhancing transpiration rates of WT- Arabidopsis and tobacco plants and of the hy5 mutant in Arabidopsis. In addition, we show that GCHY5 can reverse the low transpiration caused by guard cell overexpression of the sugar sensor HEXOKINASE1 (HXK1, GCHXK), an established low transpiring genotype. Finally, we suggest that the GCHY5 reversion of low transpiration by GCHXK requires the auto-activation of the endogenous HY5 in other tissues. These findings support the existence of an ongoing diurnal regulation of transpiration by the light-responsive transcription factors HY5 and PIF4 in the stomata, which ultimately determine the whole-plant water use efficiency.
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Affiliation(s)
- Gilor Kelly
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel
| | - Adi Yaaran
- School of Plant Science and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - Atara Gal
- School of Plant Science and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - Aiman Egbaria
- School of Plant Science and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - Danja Brandsma
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel
| | - Eduard Belausov
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel
| | - Dalia Wolf
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel
| | - Rakefet David-Schwartz
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel
| | - David Granot
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel
| | - Yoram Eyal
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel
| | - Nir Carmi
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion 7505101, Israel
| | - Nir Sade
- School of Plant Science and Food Security, Tel Aviv University, Tel Aviv, Israel.
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Li X, Liu L, Sun S, Li Y, Jia L, Ye S, Yu Y, Dossa K, Luan Y. Transcriptome analysis reveals the key pathways and candidate genes involved in salt stress responses in Cymbidium ensifolium leaves. BMC PLANT BIOLOGY 2023; 23:64. [PMID: 36721093 PMCID: PMC9890885 DOI: 10.1186/s12870-023-04050-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 01/06/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND Cymbidium ensifolium L. is known for its ornamental value and is frequently used in cosmetics. Information about the salt stress response of C. ensifolium is scarce. In this study, we reported the physiological and transcriptomic responses of C. ensifolium leaves under the influence of 100 mM NaCl stress for 48 (T48) and 96 (T96) hours. RESULTS Leaf Na+ content, activities of the antioxidant enzymes i.e., superoxide dismutase, glutathione S-transferase, and ascorbate peroxidase, and malondialdehyde content were increased in salt-stressed leaves of C. ensifolium. Transcriptome analysis revealed that a relatively high number of genes were differentially expressed in CKvsT48 (17,249) compared to CKvsT96 (5,376). Several genes related to salt stress sensing (calcium signaling, stomata closure, cell-wall remodeling, and ROS scavenging), ion balance (Na+ and H+), ion homeostasis (Na+/K+ ratios), and phytohormone signaling (abscisic acid and brassinosteroid) were differentially expressed in CKvsT48, CKvsT96, and T48vsT96. In general, the expression of genes enriched in these pathways was increased in T48 compared to CK while reduced in T96 compared to T48. Transcription factors (TFs) belonging to more than 70 families were differentially expressed; the major families of differentially expressed TFs included bHLH, NAC, MYB, WRKY, MYB-related, and C3H. A Myb-like gene (CenREV3) was further characterized by overexpressing it in Arabidopsis thaliana. CenREV3's expression was decreased with the prolongation of salt stress. As a result, the CenREV3-overexpression lines showed reduced root length, germination %, and survival % suggesting that this TF is a negative regulator of salt stress tolerance. CONCLUSION These results provide the basis for future studies to explore the salt stress response-related pathways in C. ensifolium.
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Affiliation(s)
- Xiang Li
- The First Affiliated Hospital of Yunnan University of Traditional Chinese Medicine, 650021, Kunming, China
| | - Lanlan Liu
- Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, 650224, Kunming, China
| | - Shixian Sun
- Yunnan Key Laboratory of Plateau Wetland Conservation, Restoration and Ecological Services, Southwest Forestry University, 650224, Kunming, China
| | - Yanmei Li
- Department of Life Technology Teaching and Research, School of Life Science, Southwest Forestry University, 650224, Kunming, China
| | - Lu Jia
- Department of Life Technology Teaching and Research, School of Life Science, Southwest Forestry University, 650224, Kunming, China
| | - Shili Ye
- Faculty of Mathematics and Physics, Southwest Forestry University, 650224, Kunming, China
| | - Yanxuan Yu
- Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, 650224, Kunming, China
| | - Komivi Dossa
- CIRAD, UMR AGAP Institute, F-34398, Montpellier, France
| | - Yunpeng Luan
- The First Affiliated Hospital of Yunnan University of Traditional Chinese Medicine, 650021, Kunming, China.
- Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, 650224, Kunming, China.
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Rosado-Souza L, Yokoyama R, Sonnewald U, Fernie AR. Understanding source-sink interactions: Progress in model plants and translational research to crops. MOLECULAR PLANT 2023; 16:96-121. [PMID: 36447435 DOI: 10.1016/j.molp.2022.11.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/27/2022] [Accepted: 11/25/2022] [Indexed: 06/16/2023]
Abstract
Agriculture is facing a massive increase in demand per hectare as a result of an ever-expanding population and environmental deterioration. While we have learned much about how environmental conditions and diseases impact crop yield, until recently considerably less was known concerning endogenous factors, including within-plant nutrient allocation. In this review, we discuss studies of source-sink interactions covering both fundamental research in model systems under controlled growth conditions and how the findings are being translated to crop plants in the field. In this respect we detail efforts aimed at improving and/or combining C3, C4, and CAM modes of photosynthesis, altering the chloroplastic electron transport chain, modulating photorespiration, adopting bacterial/algal carbon-concentrating mechanisms, and enhancing nitrogen- and water-use efficiencies. Moreover, we discuss how modulating TCA cycle activities and primary metabolism can result in increased rates of photosynthesis and outline the opportunities that evaluating natural variation in photosynthesis may afford. Although source, transport, and sink functions are all covered in this review, we focus on discussing source functions because the majority of research has been conducted in this field. Nevertheless, considerable recent evidence, alongside the evidence from classical studies, demonstrates that both transport and sink functions are also incredibly important determinants of yield. We thus describe recent evidence supporting this notion and suggest that future strategies for yield improvement should focus on combining improvements in each of these steps to approach yield optimization.
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Affiliation(s)
- Laise Rosado-Souza
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany.
| | - Ryo Yokoyama
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Uwe Sonnewald
- Department of Biochemistry, University of Erlangen-Nuremberg, Staudtstrasse 5, 91058 Erlangen, Germany
| | - Alisdair R Fernie
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany.
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6
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Ren R, Wan Z, Chen H, Zhang Z. The effect of inter-varietal variation in sugar hydrolysis and transport on sugar content and photosynthesis in Vitis vinifera L. leaves. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2022; 189:1-13. [PMID: 36030618 DOI: 10.1016/j.plaphy.2022.07.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 07/17/2022] [Accepted: 07/23/2022] [Indexed: 06/15/2023]
Abstract
Sugar synthesis from photosynthesis and its utilization through sugar metabolism jointly determine leaf sugar content, and in contrast, excess sugar represses leaf photosynthesis. Although plant photosynthesis is affected by leaf sugar metabolism, the relationship between sugar metabolism and photosynthetic capacity of different grape genotypes remains unclear. In this study, two grape (Vitis vinifera L.) genotypes 'Riesling' (RI, high sugar content in leaf) and 'Petit Manseng' (PM, low sugar content in leaf) were used to evaluate the relationship between sugar metabolism and photosynthesis. Sugar content, chlorophyll content, photosynthetic parameters, enzyme activity, and gene expression related to sucrose metabolism in leaves were measured, and the correlations between photosynthesis and sugar metabolism were assessed. The contents of sucrose and glucose were significantly higher in RI leaves than in PM leaves, while the fructose content pattern was reversed. Cell wall invertase activity for sucrose hydrolysis and the transcript levels of VvCWINV, VvHTs, VvTMT1, VvFKs, and VvHXK2 were also higher in RI leaves than in PM leaves, whereas that of VvHXK1 mediating glucose phosphorylation, was lower in RI leaves than in PM leaves. Net photosynthetic rate, stomatal conductance, transpiration rate, and chlorophyll content were lower in RI leaves than in PM leaves and negatively correlated with glucose content, and the transcript levels of VvCWINV, VvHTs, VvTMT1, and VvHXK2. In conclusion, this study indicates that leaf sugar metabolism and transport are related to photosynthesis in Vitis vinifera L., which provides a theoretical basis for improving grape photosynthesis.
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Affiliation(s)
- Ruihua Ren
- College of Enology, Northwest A&F University, No. 22 Xinong Road, Yangling, Shaanxi, 712100, China.
| | - Zhuowu Wan
- College of Enology, Northwest A&F University, No. 22 Xinong Road, Yangling, Shaanxi, 712100, China.
| | - Huawei Chen
- College of Enology, Northwest A&F University, No. 22 Xinong Road, Yangling, Shaanxi, 712100, China.
| | - Zhenwen Zhang
- College of Enology, Northwest A&F University, No. 22 Xinong Road, Yangling, Shaanxi, 712100, China; China Wine Industry Technology Institute, Room 1606, Zhongguancun Innovation Center, Yinchuan, Ningxia, 750021, China.
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7
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Acevedo-Siaca LG, Głowacka K, Driever SM, Salesse-Smith CE, Lugassi N, Granot D, Long SP, Kromdijk J. Guard-cell-targeted overexpression of Arabidopsis Hexokinase 1 can improve water use efficiency in field-grown tobacco plants. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:5745-5757. [PMID: 35595294 PMCID: PMC9467653 DOI: 10.1093/jxb/erac218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 05/18/2022] [Indexed: 06/15/2023]
Abstract
Water deficit currently acts as one of the largest limiting factors for agricultural productivity worldwide. Additionally, limitation by water scarcity is projected to continue in the future with the further onset of effects of global climate change. As a result, it is critical to develop or breed for crops that have increased water use efficiency and that are more capable of coping with water scarce conditions. However, increased intrinsic water use efficiency (iWUE) typically brings a trade-off with CO2 assimilation as all gas exchange is mediated by stomata, through which CO2 enters the leaf while water vapor exits. Previously, promising results were shown using guard-cell-targeted overexpression of hexokinase to increase iWUE without incurring a penalty in photosynthetic rates or biomass production. Here, two homozygous transgenic tobacco (Nicotiana tabacum) lines expressing Arabidopsis Hexokinase 1 (AtHXK1) constitutively (35SHXK2 and 35SHXK5) and a line that had guard-cell-targeted overexpression of AtHXK1 (GCHXK2) were evaluated relative to wild type for traits related to photosynthesis and yield. In this study, iWUE was significantly higher in GCHXK2 compared with wild type without negatively impacting CO2 assimilation, although results were dependent upon leaf age and proximity of precipitation event to gas exchange measurement.
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Affiliation(s)
- Liana G Acevedo-Siaca
- International Maize and Wheat Improvement Center (CIMMYT), El Batan, Mexico
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Katarzyna Głowacka
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Steven M Driever
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Coralie E Salesse-Smith
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Nitsan Lugassi
- Institute of Plant Sciences, Agricultural Research Organisation, The Volcani Center, Bet Dagan, Israel
| | - David Granot
- Institute of Plant Sciences, Agricultural Research Organisation, The Volcani Center, Bet Dagan, Israel
| | - Stephen P Long
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
- Lancaster Environment Centre, University of Lancaster, Lancaster, UK
| | - Johannes Kromdijk
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
- Department of Plant Sciences, University of Cambridge, Cambridge, UK
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8
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Han M, Xu X, Xiong Y, Wei H, Yao K, Huang T, Long Y, Su T. Genome-Wide Survey and Expression Analyses of Hexokinase Family in Poplar (Populus trichocarpa). PLANTS 2022; 11:plants11152025. [PMID: 35956502 PMCID: PMC9370503 DOI: 10.3390/plants11152025] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/01/2022] [Accepted: 08/02/2022] [Indexed: 11/16/2022]
Abstract
Hexokinase (HXK) family proteins exert critical roles in catalyzing hexose phosphorylation, sugar sensing, and modulation of plant growth and stress adaptation. Nevertheless, a large amount remains unknown about the molecular profile of HXK enzymes in Populus trichocarpa, a woody model tree species. A genome-wide survey of HXK-encoding genes, including phylogenies, genomic structures, exon/intron organization, chromosomal distribution, and conserved features, was conducted, identifying six putative HXK isogenes (PtHXK1-6) in the Populus genome. The evolutionary tree demonstrated that 135 homologous HXKs between 17 plant species were categorized into four major subfamilies (type A, B, C, and D), clustering one plastidic (PtHXK3) and five mitochondrial PtHXKs grouped into type A and B, respectively. The in silico deduction prompted the presence of the conserved sugar-binding core (motif 4), phosphorylation sites (motif 2 and 3), and adenosine-binding domains (motif 7). The transcriptomic sequencing (RNA-seq) and the quantitative real-time PCR (qRT-PCR) assays revealed that three isogenes (PtHXK2, 3, and 6) were abundantly expressed in leaves, stems, and roots, while others appeared to be dominantly expressed in the reproductive tissues. Under the stress exposure, PtHXK2 and 6 displayed a significant induction upon the pathogenic fungi (Fusarium solani) infection and marked promotions by glucose feeding in roots. In contrast, the PtHXK3 and 6 are ABA-responsive genes, following a dose-dependent manner. The comprehensive analyses of the genomic patterns and expression profiling provide theoretical clues and lay a foundation for unraveling the physiological and signaling roles underlying the fine-tuned PtHXKs responding to diverse stressors.
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Affiliation(s)
- Mei Han
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; (M.H.); (X.X.); (Y.X.); (H.W.); (K.Y.); (T.H.); (Y.L.)
| | - Xianglei Xu
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; (M.H.); (X.X.); (Y.X.); (H.W.); (K.Y.); (T.H.); (Y.L.)
- Key Laboratory of State Forestry Administration on Subtropical Forest Biodiversity Conservation, Nanjing Forestry University, Nanjing 210037, China
| | - Yuan Xiong
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; (M.H.); (X.X.); (Y.X.); (H.W.); (K.Y.); (T.H.); (Y.L.)
- Key Laboratory of State Forestry Administration on Subtropical Forest Biodiversity Conservation, Nanjing Forestry University, Nanjing 210037, China
| | - Haikun Wei
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; (M.H.); (X.X.); (Y.X.); (H.W.); (K.Y.); (T.H.); (Y.L.)
| | - Kejun Yao
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; (M.H.); (X.X.); (Y.X.); (H.W.); (K.Y.); (T.H.); (Y.L.)
| | - Tingting Huang
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; (M.H.); (X.X.); (Y.X.); (H.W.); (K.Y.); (T.H.); (Y.L.)
| | - Yingle Long
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; (M.H.); (X.X.); (Y.X.); (H.W.); (K.Y.); (T.H.); (Y.L.)
| | - Tao Su
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; (M.H.); (X.X.); (Y.X.); (H.W.); (K.Y.); (T.H.); (Y.L.)
- Key Laboratory of State Forestry Administration on Subtropical Forest Biodiversity Conservation, Nanjing Forestry University, Nanjing 210037, China
- Correspondence: ; Tel.: +86-1589-598-3381
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9
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Li S, Yu S, Zhang Y, Zhu D, Li F, Chen B, Mei F, Du L, Ding L, Chen L, Song J, Kang Z, Mao H. Genome-wide association study revealed TaHXK3-2A as a candidate gene controlling stomatal index in wheat seedlings. PLANT, CELL & ENVIRONMENT 2022; 45:2306-2323. [PMID: 35545896 DOI: 10.1111/pce.14342] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 12/01/2021] [Accepted: 12/01/2021] [Indexed: 06/15/2023]
Abstract
Stomata are important channels for the control of gas exchange between plants and the atmosphere. To examine the genetic architecture of wheat stomatal index, we performed a genome-wide association study (GWAS) using a panel of 539 wheat accessions and 450 678 polymorphic single nucleotide polymorphisms (SNPs) that were detected using wheat-specific 660K SNP array. A total of 130 SNPs were detected to be significantly associated with stomatal index in both leaf surfaces of wheat seedlings. These significant SNPs were distributed across 16 chromosomes and involved 2625 candidate genes which participate in stress response, metabolism and cell/organ development. Subsequent bulk segregant analysis (BSA), combined with GWAS identified one major haplotype on chromosome 2A, that is responsible for stomatal index on the abaxial leaf surface. Candidate gene association analysis revealed that genetic variation in the promoter region of the hexokinase gene TaHXK3-2A was significantly associated with the stomatal index. Moreover, transgenic analysis confirmed that TaHXK3-2A overexpression in wheat decreased the size of leaf pavement cells but increased stomatal density through the glucose metabolic pathway, resulting in drought sensitivity among TaHXK3-2A transgenic lines due to an increased transpiration rate. Taken together, these results provide valuable insights into the genetic control of the stomatal index in wheat seedlings.
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Affiliation(s)
- Shumin Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Shizhou Yu
- Molecular Genetics Key Laboratory of China Tobacco, Guizhou Academy of Tobacco Science, Guiyang, Guizhou, China
| | - Yifang Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Dehe Zhu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Fangfang Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Bin Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Fangming Mei
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Linying Du
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Science, Northwest A&F University, Yangling, Shaanxi, China
| | - Li Ding
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Lei Chen
- School of Life Sciences, Yantai University, Yantai, Shandong, China
| | - Jiancheng Song
- School of Life Sciences, Yantai University, Yantai, Shandong, China
| | - Zhensheng Kang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Hude Mao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
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10
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Cândido-Sobrinho SA, Lima VF, Freire FBS, de Souza LP, Gago J, Fernie AR, Daloso DM. Metabolism-mediated mechanisms underpin the differential stomatal speediness regulation among ferns and angiosperms. PLANT, CELL & ENVIRONMENT 2022; 45:296-311. [PMID: 34800300 DOI: 10.1111/pce.14232] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 11/12/2021] [Accepted: 11/14/2021] [Indexed: 06/13/2023]
Abstract
Recent results suggest that metabolism-mediated stomatal closure mechanisms are important to regulate differentially the stomatal speediness between ferns and angiosperms. However, evidence directly linking mesophyll metabolism and the slower stomatal conductance (gs ) in ferns is missing. Here, we investigated the effect of exogenous application of abscisic acid (ABA), sucrose and mannitol on stomatal kinetics and carried out a metabolic fingerprinting analysis of ferns and angiosperms leaves harvested throughout a diel course. Fern stomata did not respond to ABA in the time period analysed. No differences in the relative decrease in gs was observed between ferns and the angiosperm following provision of sucrose or mannitol. However, ferns have slower gs responses to these compounds than angiosperms. Metabolomics analysis highlights that ferns have a higher accumulation of secondary rather than primary metabolites throughout the diel course, with the opposite being observed in angiosperms. Our results indicate that metabolism-mediated stomatal closure mechanisms underpin the differential stomatal speediness regulation among ferns and angiosperms, in which the slower stomatal closure in ferns is associated with the lack of ABA-responsiveness, to a reduced capacity to respond to mesophyll-derived sucrose and to a higher carbon allocation toward secondary metabolism, which likely modulates both photosynthesis-gs and growth-stress tolerance trade-offs.
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Affiliation(s)
- Silvio A Cândido-Sobrinho
- Departamento de Bioquímica e Biologia Molecular, LabPlant, Universidade Federal do Ceará, Fortaleza-CE, Brasil
| | - Valéria F Lima
- Departamento de Bioquímica e Biologia Molecular, LabPlant, Universidade Federal do Ceará, Fortaleza-CE, Brasil
| | - Francisco B S Freire
- Departamento de Bioquímica e Biologia Molecular, LabPlant, Universidade Federal do Ceará, Fortaleza-CE, Brasil
| | - Leonardo P de Souza
- Central Metabolism Group, Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
| | - Jorge Gago
- Research Group On Plant Biology Under Mediterranean Conditions, Instituto de investigaciones Agroambientales y de la Economía del Agua (INAGEA), Universitat de les Illes Balears, Palma de Mallorca, Spain
| | - Alisdair R Fernie
- Central Metabolism Group, Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
| | - Danilo M Daloso
- Departamento de Bioquímica e Biologia Molecular, LabPlant, Universidade Federal do Ceará, Fortaleza-CE, Brasil
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11
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Lehretz GG, Sonnewald S, Sonnewald U. Assimilate highway to sink organs - Physiological consequences of SP6A overexpression in transgenic potato (Solanum tuberosum L.). JOURNAL OF PLANT PHYSIOLOGY 2021; 266:153530. [PMID: 34610522 DOI: 10.1016/j.jplph.2021.153530] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 09/19/2021] [Indexed: 06/13/2023]
Abstract
Leaf/stem-specific overexpression of SP6A, the FLOWERING LOCUS T homolog in potato (Solanum tuberosum), was previously shown to induce tuberization leading to higher tuber numbers and yield under ambient and abiotic stress conditions. In this study, we investigated the mechanism underlying SP6A action. Overexpression of SP6A reduced shoot growth, mainly by inhibition of stem elongation and secondary growth, and by repression of apical bud outgrowth. In contrast, root growth and lateral shoot emergence from basal nodes was promoted. Tracer experiments using the fluorescent sucrose analogue esculin revealed that stems of SP6A overexpressing plants transport assimilates more efficiently to belowground sinks, e.g. roots and tubers, compared to wild-type plants. This was accompanied by a lower level of sucrose leakage from the transport phloem into neighboring parenchyma cells and the inhibition of flower formation. We demonstrate the ability of SP6A to control assimilate allocation to belowground sinks and postulate that selection of beneficial SP6A alleles will enable potato breeding to alter plant architecture and to increase tuber yield under conditions of expected climate change.
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Affiliation(s)
- Günter G Lehretz
- Department of Biology, Division of Biochemistry, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstrasse 5, 91058, Erlangen, Germany
| | - Sophia Sonnewald
- Department of Biology, Division of Biochemistry, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstrasse 5, 91058, Erlangen, Germany
| | - Uwe Sonnewald
- Department of Biology, Division of Biochemistry, Friedrich-Alexander-University Erlangen-Nuremberg, Staudtstrasse 5, 91058, Erlangen, Germany.
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12
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Kelly G, Brandsma D, Egbaria A, Stein O, Doron-Faigenboim A, Lugassi N, Belausov E, Zemach H, Shaya F, Carmi N, Sade N, Granot D. Guard cells control hypocotyl elongation through HXK1, HY5, and PIF4. Commun Biol 2021; 4:765. [PMID: 34155329 PMCID: PMC8217561 DOI: 10.1038/s42003-021-02283-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 06/01/2021] [Indexed: 02/06/2023] Open
Abstract
The hypocotyls of germinating seedlings elongate in a search for light to enable autotrophic sugar production. Upon exposure to light, photoreceptors that are activated by blue and red light halt elongation by preventing the degradation of the hypocotyl-elongation inhibitor HY5 and by inhibiting the activity of the elongation-promoting transcription factors PIFs. The question of how sugar affects hypocotyl elongation and which cell types stimulate and stop that elongation remains unresolved. We found that overexpression of a sugar sensor, Arabidopsis hexokinase 1 (HXK1), in guard cells promotes hypocotyl elongation under white and blue light through PIF4. Furthermore, expression of PIF4 in guard cells is sufficient to promote hypocotyl elongation in the light, while expression of HY5 in guard cells is sufficient to inhibit the elongation of the hy5 mutant and the elongation stimulated by HXK1. HY5 exits the guard cells and inhibits hypocotyl elongation, but is degraded in the dark. We also show that the inhibition of hypocotyl elongation by guard cells' HY5 involves auto-activation of HY5 expression in other tissues. It appears that guard cells are capable of coordinating hypocotyl elongation and that sugar and HXK1 have the opposite effect of light on hypocotyl elongation, converging at PIF4.
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Affiliation(s)
- Gilor Kelly
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Danja Brandsma
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Aiman Egbaria
- School of Plant Science and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - Ofer Stein
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Adi Doron-Faigenboim
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Nitsan Lugassi
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Eduard Belausov
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Hanita Zemach
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Felix Shaya
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Nir Carmi
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Nir Sade
- School of Plant Science and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - David Granot
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel.
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13
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Attia Z, Pogoda CS, Reinert S, Kane NC, Hulke BS. Breeding for sustainable oilseed crop yield and quality in a changing climate. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2021; 134:1817-1827. [PMID: 33496832 DOI: 10.1007/s00122-021-03770-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 01/09/2021] [Indexed: 05/26/2023]
Abstract
As the effects of climate change continue to alter crop-growing conditions year-to-year on both prime and marginal agricultural landscapes, we must consider the effects not only on yield but also on quality. This is particularly true for oilseed crops. In this review, we explore the importance of oilseeds in general and the specific uses of major oilseed crops including soybean, sunflower, canola, peanut, and cottonseed. We review the physiology of seed oil production, from the perspective of the plant's adaptation to environmental changes. Of particular importance is the role of temperature and water availability on oil synthesis. We then discuss how this influences genetic variation, phenotype variability due to environment, and the interaction of genetics and environment to affect composition and yield of vegetable oils. The ability to predict these effects using genomics and bioinformatics is an important new frontier for breeders to maximize stability of a desired fatty acid composition for their crop over increasingly extreme agricultural environments.
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Affiliation(s)
- Ziv Attia
- Ecology and Evolutionary Biology Department, University of Colorado, 1900 Pleasant Street, 334 UCB, Boulder, CO, 80309-0334, US
| | - Cloe S Pogoda
- Ecology and Evolutionary Biology Department, University of Colorado, 1900 Pleasant Street, 334 UCB, Boulder, CO, 80309-0334, US
| | - Stephan Reinert
- Ecology and Evolutionary Biology Department, University of Colorado, 1900 Pleasant Street, 334 UCB, Boulder, CO, 80309-0334, US
- Center for Computational and Theoretical Biology, Julius-Maximilian University Würzburg, Hubland North 32, 97074, Würzburg, Germany
| | - Nolan C Kane
- Ecology and Evolutionary Biology Department, University of Colorado, 1900 Pleasant Street, 334 UCB, Boulder, CO, 80309-0334, US
| | - Brent S Hulke
- USDA-ARS Edward T Schafer Agricultural Research Center, 1616 Albrecht Blvd. N, Fargo, ND, 58102-2765, US.
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Shen C, Zhang Y, Li Q, Liu S, He F, An Y, Zhou Y, Liu C, Yin W, Xia X. PdGNC confers drought tolerance by mediating stomatal closure resulting from NO and H 2 O 2 production via the direct regulation of PdHXK1 expression in Populus. THE NEW PHYTOLOGIST 2021; 230:1868-1882. [PMID: 33629353 DOI: 10.1111/nph.17301] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 02/14/2021] [Indexed: 05/28/2023]
Abstract
Drought is one of the primary abiotic stresses, seriously implicating plant growth and productivity. Stomata play a crucial role in regulating drought tolerance. However, the molecular mechanism on stomatal movement-mediated drought tolerance remains unclear. Using genetic, molecular and biochemical techniques, we identified that the PdGNC directly activating the promoter of PdHXK1 by binding the GATC element, a hexokinase (HXK) synthesis key gene. Here, PdGNC, a member of the GATA transcription factor family, was greatly induced by abscisic acid and dehydration. Overexpressing PdGNC in poplar (Populus clone 717) resulted in reduced stomatal aperture with greater water-use efficiency and increased water deficit tolerance. By contrast, CRISPR/Cas9-mediated poplar mutant gnc exhibited increased stomatal aperture and water loss with reducing drought resistance. PdGNC activates PdHXK1 (a hexokinase synthesis key gene), resulting in a remarkable increase in hexokinase activity in poplars subjected to water deficit. Furthermore, hexokinase promoted nitric oxide (NO) and hydrogen peroxide (H2 O2 ) production in guard cells, which ultimately reduced stomatal aperture and increased drought resistance. Together, PdGNC confers drought stress tolerance by reducing stomatal aperture caused by NO and H2 O2 production via the direct regulation of PdHXK1 expression in poplars.
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Affiliation(s)
- Chao Shen
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Yue Zhang
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Qing Li
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Shujing Liu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Fang He
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Yi An
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Yangyan Zhou
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Chao Liu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Weilun Yin
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
| | - Xinli Xia
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China
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15
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Müller M, Schneider JR, Klein VA, da Silva E, da Silva Júnior JP, Souza AM, Chavarria G. Soybean Root Growth in Response to Chemical, Physical, and Biological Soil Variations. FRONTIERS IN PLANT SCIENCE 2021; 12:602569. [PMID: 33732272 PMCID: PMC7959720 DOI: 10.3389/fpls.2021.602569] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 02/04/2021] [Indexed: 05/27/2023]
Abstract
Environmental conditions affect crop yield, and water deficit has been highlighted by the negative impact on soybean grain production. Radicial growth in greater volume and depth can be an alternative to minimize losses caused by a lack of water. Therefore, knowledge of how soybean roots behave before the chemical, physical, and biological attributes of the soil can help establish managements that benefit in-depth root growth. The objective was to evaluate the growth of soybean roots in response to chemical, physical, and biological variations in the soil, in different soil locations and depths. Six experiments were conducted in different locations. Soil samples were collected every 5 cm of soil up to 60 cm of soil depth for chemical, physical, and biological analysis. The roots were collected every 5 cm deep up to 45 cm deep from the ground. The six sites presented unsatisfactory values of pH and organic matter, and presented phosphorus, potassium, and calcium at high concentrations in the first centimeters of soil depth. The total porosity of the soil was above 0.50 m3 m-3, but the proportion of the volume of macropores, micropores, and cryptopores resulted in soils with resistance to penetration to the roots. Microbial biomass was higher on the soil surface when compared to deeper soil layers, however, the metabolic quotient was higher in soil depth, showing that microorganisms in depth have low ability to incorporate carbon into microbial biomass. Root growth occurred in a greater proportion in the first centimeters of soil-depth, possibly because the soil attributes that favor the root growth is concentrated on the soil surface.
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Affiliation(s)
- Mariele Müller
- Agronomy Post-Graduate Program, Faculty of Agronomy and Veterinary Medicine, University of Passo Fundo, Passo Fundo, Brazil
| | - Julia Renata Schneider
- Agronomy Post-Graduate Program, Faculty of Agronomy and Veterinary Medicine, University of Passo Fundo, Passo Fundo, Brazil
| | - Vilson Antônio Klein
- Agronomy Post-Graduate Program, Faculty of Agronomy and Veterinary Medicine, University of Passo Fundo, Passo Fundo, Brazil
| | - Eliardo da Silva
- Faculty of Agronomy and Veterinary Medicine, University of Passo Fundo, Passo Fundo, Brazil
| | | | | | - Geraldo Chavarria
- Agronomy Post-Graduate Program, Faculty of Agronomy and Veterinary Medicine, University of Passo Fundo, Passo Fundo, Brazil
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16
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Li Y, Xu Y, Chen Y, Ling L, Jiang Y, Duan H, Liu J. Effects of drought regimes on growth and physiological traits of a typical shrub species in subtropical China. Glob Ecol Conserv 2020. [DOI: 10.1016/j.gecco.2020.e01269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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17
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Lehretz GG, Sonnewald S, Lugassi N, Granot D, Sonnewald U. Future-Proofing Potato for Drought and Heat Tolerance by Overexpression of Hexokinase and SP6A. FRONTIERS IN PLANT SCIENCE 2020; 11:614534. [PMID: 33510758 PMCID: PMC7835534 DOI: 10.3389/fpls.2020.614534] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 12/07/2020] [Indexed: 05/18/2023]
Abstract
Crop yield is largely affected by global climate change. Especially periods of heat and drought limit crop productivity worldwide. According to current models of future climate scenarios, heatwaves and periods of drought are likely to increase. Potato, as an important food crop of temperate latitudes, is very sensitive to heat and drought which impact tuber yield and quality. To improve abiotic stress resilience of potato plants, we aimed at co-expressing hexokinase 1 from Arabidopsis thaliana (AtHXK1) in guard cells and SELF-PRUNING 6A (SP6A) using the leaf/stem-specific StLS1 promoter in order to increase water use efficiency as well as tuberization under drought and heat stress. Guard cell-specific expression of AtHXK1 decreased stomatal conductance and improved water use efficiency of transgenic potato plants as has been shown for other crop plants. Additionally, co-expression with the FT-homolog SP6A stimulated tuberization and improved assimilate allocation to developing tubers under control as well as under single and combined drought and heat stress conditions. Thus, co-expression of both proteins provides a novel strategy to improve abiotic stress tolerance of potato plants.
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Affiliation(s)
- Günter G. Lehretz
- Division of Biochemistry, Department of Biology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Sophia Sonnewald
- Division of Biochemistry, Department of Biology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Nitsan Lugassi
- The Volcani Center, Institute of Plant Sciences, Agricultural Research Organization, Rishon Le-Zion, Israel
| | - David Granot
- The Volcani Center, Institute of Plant Sciences, Agricultural Research Organization, Rishon Le-Zion, Israel
| | - Uwe Sonnewald
- Division of Biochemistry, Department of Biology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
- *Correspondence: Uwe Sonnewald,
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