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Milyaev A, Kofler J, Moya YAT, Lempe J, Stefanelli D, Hanke MV, Flachowsky H, von Wirén N, Wünsche JN. Profiling of phytohormones in apple fruit and buds regarding their role as potential regulators of flower bud formation. TREE PHYSIOLOGY 2022; 42:2319-2335. [PMID: 35867427 PMCID: PMC9912367 DOI: 10.1093/treephys/tpac083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 06/20/2022] [Indexed: 06/15/2023]
Abstract
Apple (Malus × domestica Borkh.) cropping behavior, if not regulated, is often manifested by high yields of small-sized fruit in so called ON-years, which are usually followed by strongly reduced crop loads in OFF-years. Such cropping pattern is defined as biennial bearing and causes significant losses in apple production. The growth of apple fruit overlaps with the formation of flower buds, which remain dormant until the following spring. Earlier works proposed that some fruit-derived mobile compounds, as e.g., phytohormones, could suppress flower bud formation that thereby leads to biennial bearing. We addressed this hypothesis by analyzing 39 phytohormones in apple seeds, fruit flesh and by measuring phytohormone export from the fruits of the biennial bearing cultivar 'Fuji' and of the regular bearing cultivar 'Gala'. Moreover, we analyzed the same compounds in bourse buds from fruiting (ON-trees) and non-fruiting (OFF-trees) spurs of both apple cultivars over the period of flower bud formation. Our results showed that apple fruit exported at least 14 phytohormones including indole-3-acetic acid and gibberellin A3; however, their influence on flower bud formation was inconclusive. A gibberellin-like compound, which was detected exclusively in bourse buds, was significantly more abundant in bourse buds from ON-trees compared with OFF-trees. Cultivar differences were marked by the accumulation of trans-zeatin-O-glucoside in bourse buds of 'Gala' ON-trees, whereas the levels of this compound in 'Gala' OFF were significantly lower and comparable to those in 'Fuji' ON- and OFF-trees. Particular phytohormones including five cytokinin forms as well as abscisic acid and its degradation products had higher levels in bourse buds from OFF-trees compared with ON-trees and were therefore proposed as potential promotors of flower bud initiation. The work discusses regulatory roles of phytohormones in flower bud formation in apple based on the novel and to date most comprehensive phytohormone profiles of apple fruit and buds.
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Affiliation(s)
| | - Julian Kofler
- Institute of Crop Science, Section of Crop Physiology of Specialty Crops (340f), University of Hohenheim, Emil-Wolff-Street 25, 70599 Stuttgart, Germany
| | - Yudelsy Antonia Tandron Moya
- Department Molecular Plant Nutrition, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Janne Lempe
- Julius Kühn-Institute (JKI), Institute for Breeding Research on Fruit Crops, Federal Research Centre for Cultivated Plants, Pillnitzer Platz 3a, 01326 Dresden, Germany
| | - Dario Stefanelli
- Department of Primary Industries and Regional Development, Government of Western Australia, Locked Bag 7, 6258 Manjimup, Australia
| | - Magda-Viola Hanke
- Julius Kühn-Institute (JKI), Institute for Breeding Research on Fruit Crops, Federal Research Centre for Cultivated Plants, Pillnitzer Platz 3a, 01326 Dresden, Germany
| | - Henryk Flachowsky
- Julius Kühn-Institute (JKI), Institute for Breeding Research on Fruit Crops, Federal Research Centre for Cultivated Plants, Pillnitzer Platz 3a, 01326 Dresden, Germany
| | - Nicolaus von Wirén
- Department Molecular Plant Nutrition, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Stadt Seeland, OT Gatersleben, Germany
| | - Jens-Norbert Wünsche
- Institute of Crop Science, Section of Crop Physiology of Specialty Crops (340f), University of Hohenheim, Emil-Wolff-Street 25, 70599 Stuttgart, Germany
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Mesejo C, Marzal A, Martínez-Fuentes A, Reig C, de Lucas M, Iglesias DJ, Primo-Millo E, Blázquez MA, Agustí M. Reversion of fruit-dependent inhibition of flowering in Citrus requires sprouting of buds with epigenetically silenced CcMADS19. THE NEW PHYTOLOGIST 2022; 233:526-533. [PMID: 34403516 DOI: 10.1111/nph.17681] [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: 06/22/2021] [Accepted: 08/10/2021] [Indexed: 05/16/2023]
Abstract
In Citrus, the response to environmental floral inductive signals is inhibited by the presence of developing fruits. The mechanism involves epigenetic activation of the CcMADS19 locus (FLC orthologue), encoding a floral repressor. To understand how this epigenetic regulation is reverted to allow flowering in the following season, we have forced precocious sprouting of axillary buds in fruit-bearing shoots, and examined the competence to floral inductive signals of old and new leaves derived from them. We have found that CcMADS19 is enriched in repressive H3K27me3 marks in young, but not old leaves, revealing that axillary buds retain a silenced version of the floral repressor that is mitotically transmitted to the newly emerging leaves, which are able to induce flowering. Therefore, we propose that flowering in Citrus is necessarily preceded by vegetative sprouting, so that the competence to respond to floral inductive signals is reset in the new leaves.
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Affiliation(s)
- Carlos Mesejo
- Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, València, 46022, Spain
| | - Andrés Marzal
- Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, València, 46022, Spain
| | - Amparo Martínez-Fuentes
- Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, València, 46022, Spain
| | - Carmina Reig
- Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, València, 46022, Spain
| | - Miguel de Lucas
- Department of Biosciences, Durham University, Stockton Rd, Durham, DH1 3LE, UK
| | - Domingo J Iglesias
- Centro de Citricultura y Producción Vegetal, IVIA-GV, Moncada, València, 46113, Spain
| | - Eduardo Primo-Millo
- Centro de Citricultura y Producción Vegetal, IVIA-GV, Moncada, València, 46113, Spain
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas, CSIC-UPV, València, 46022, Spain
| | - Manuel Agustí
- Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, València, 46022, Spain
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High crop load and low temperature delay the onset of bud initiation in apple. Sci Rep 2019; 9:17986. [PMID: 31784602 PMCID: PMC6884464 DOI: 10.1038/s41598-019-54381-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 11/14/2019] [Indexed: 11/08/2022] Open
Abstract
The reproductive cycle of apple (Malus × domestica Borkh.) starts with the induction of floral development, however, first morphological changes within the bud appear during the following period of bud initiation. This study identifies the onset and duration of bud initiation in the apple cultivars 'Fuji' and 'Gala', characterized by biennial and non-biennial bearing behaviour, respectively, and describes the effect of crop load and heat accumulation on the temporal pattern of floral development. The onset of flower bud initiation in heavy cropping 'Gala' trees was delayed for 20 days compared to trees with no crop load, but the rate of initiation was not affected by crop load. Bud initiation on heavy cropping 'Fuji' trees was minor, whereas trees with no crop load started initiating buds 19 days earlier than those of 'Gala' despite the same cropping status and growing degree hours in a given year. The onset of bud initiation in 'Fuji' 'off' trees was 5 and 20 days after summer solstice, respectively, in two consecutive growing seasons, suggesting that this process is driven by heat accumulation rather than by daylength. The results indicate, that the genetic make-up of the cultivar determines the onset of bud initiation. This can be delayed by increasing crop loads and low temperatures at the beginning of the flower formation process.
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Li Y, Zhang D, An N, Fan S, Zuo X, Zhang X, Zhang L, Gao C, Han M, Xing L. Transcriptomic analysis reveals the regulatory module of apple (Malus × domestica) floral transition in response to 6-BA. BMC PLANT BIOLOGY 2019; 19:93. [PMID: 30841918 PMCID: PMC6402183 DOI: 10.1186/s12870-019-1695-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 02/25/2019] [Indexed: 05/19/2023]
Abstract
BACKGROUND Insufficient production of flower buds is an intractable problem in 'Fuji' apple orchards. Although cytokinin (CK) promotes flower bud formation in apple trees, little is known about the mechanisms regulating this phenomenon. RESULTS In the present study, high-throughput RNA sequencing (RNA-Seq) of 'Nagafu No. 2' buds was conducted to characterize the transcriptional response to 6-BA treatment during key period of floral transition. A weighted gene co-expression network analysis (WGCNA) of the differentially expressed genes identified hormone signal transduction pathways, totaling 84 genes were highly correlated with the expression pattern of flowering-time genes. The up-regulation of CK signal components and a gibberellin (GA) signal repressor were found to contribute to the promotion of floral transition. In relative comparison to non-treated buds, a series of sugar metabolism- and signal- related genes were associated with relatively high levels of sucrose, fructose, and glucose during floral induction in the 6-BA treated buds. Several transcription factors (i.e. SPLs, SOC1, FD, and COL) that are involved in GA, aging, and photoperiod-regulated flowering pathways were also upregulated by the 6-BA treatment. In addition, potential transcription factors integrating CK signaling to trigger floral induction in apple were also assessed; including PHYTO-CHROME-INTERACTING FACTOR (PIF1,3), WUSCHEL-related homeobox (WOX3,13), and CK response regulators (ARR2). CONCLUSIONS The present study provides insight into the response of flowering and development-related pathways and transcription factors to 6-BA during the period of floral transition in apple. It extends our knowledge of the fundamental mechanisms associated with CK-regulated floral transition in apple trees.
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Affiliation(s)
- Youmei Li
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Dong Zhang
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Na An
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Sheng Fan
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Xiya Zuo
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Xin Zhang
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Lizhi Zhang
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Cai Gao
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Mingyu Han
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
| | - Libo Xing
- Department of Horticulture College, Northwest Agriculture & Forestry University, Yangling, 712100 China
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Zuo X, Zhang D, Wang S, Xing L, Li Y, Fan S, Zhang L, Ma J, Zhao C, Shah K, An N, Han M. Expression of genes in the potential regulatory pathways controlling alternate bearing in 'Fuji' (Malus domestica Borkh.) apple trees during flower induction. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 132:579-589. [PMID: 30326437 DOI: 10.1016/j.plaphy.2018.10.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 09/22/2018] [Accepted: 10/06/2018] [Indexed: 06/08/2023]
Abstract
Most perennial fruit trees have an alternate bearing problem where a heavy fruit load is produced one year (ON year) but few flowers and fruits produced the next year (OFF year), resulting in a significant fluctuation in production. In the present study, comparative transcriptome analysis of terminal buds of apple (Malus domestica Borkh., cv. Nagafu No. 2) trees was conducted during the floral induction period in the ON and OFF years to identify the potential regulatory pathways controlling alternate bearing. A total of 1027 differentially expressed genes (DEGs), most of which were involved in secondary metabolism, sugar metabolism, plant hormone pathways, were identified. The analysis focused on differences in sugar content and hormone levels between the ON and OFF trees. Sucrose content, zeatin-riboside (ZR), and abscisic acid (ABA) levels were lower in ON-year buds than in OFF-year buds. ON buds also had elevated levels of gibberellins (GAs), with a higher expression of GA20 oxidase (GA20ox) and a significant lower level of RGA-like2 (RGL2). Expression analyses also revealed a significantly higher level of SQUAMOSA-PROMOTER BINDING PROTEIN-LIKE genes (MdSPL1, MdSPL6 and MdSPL12) transcripts levels in buds of OFF trees at 45 days after full bloom (DAFB). LEAFY (LFY) expression increased significantly prior to flower induction in OFF buds. These findings provide new information of the role of hormones in alternate bearing, as well as other processes, and provide new insights into the molecular mechanisms regulating alternate bearing in perennial fruit trees.
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Affiliation(s)
- Xiya Zuo
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Dong Zhang
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Shixiang Wang
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Libo Xing
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Youmei Li
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Sheng Fan
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Lizhi Zhang
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Juanjuan Ma
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Caiping Zhao
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Kamran Shah
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Na An
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China
| | - Mingyu Han
- College of Horticulture, Northwest A & F University, Yangling, Shaanxi, 712100, China.
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Pallas B, Bluy S, Ngao J, Martinez S, Clément-Vidal A, Kelner JJ, Costes E. Growth and carbon balance are differently regulated by tree and shoot fruiting contexts: an integrative study on apple genotypes with contrasted bearing patterns. TREE PHYSIOLOGY 2018; 38:1395-1408. [PMID: 29325154 DOI: 10.1093/treephys/tpx166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 11/30/2017] [Indexed: 05/10/2023]
Abstract
In plants, carbon source-sink relationships are assumed to affect their reproductive effort. In fruit trees, carbon source-sink relationships are likely to be involved in their fruiting behavior. In apple, a large variability in fruiting behaviors exists, from regular to biennial, which has been related to the within-tree synchronization vs desynchronization of floral induction in buds. In this study, we analyzed if carbon assimilation, availability and fluxes as well as shoot growth differ in apple genotypes with contrasted behaviors. Another aim was to determine the scale of plant organization at which growth and carbon balance are regulated. The study was carried out on 16 genotypes belonging to three classes: (i) biennial, (ii) regular with a high production of floral buds every year and (iii) regular, displaying desynchronized bud fates in each year. Three shoot categories, vegetative and reproductive shoots with or without fruits, were included. This study shows that shoot growth and carbon balance are differentially regulated by tree and shoot fruiting contexts. Shoot growth was determined by the shoot fruiting context, or by the type of shoot itself, since vegetative shoots were always longer than reproductive shoots whatever the tree crop load. Leaf photosynthesis depended on the tree crop load only, irrespective of the shoot category or the genotypic class. Starch content was also strongly affected by the tree crop load with some adjustments of the carbon balance among shoots since starch content was lower, at least at some dates, in shoots with fruits compared with the shoots without fruits within the same trees. Finally, the genotypic differences in terms of shoot carbon balance partly matched with genotypic bearing patterns. Nevertheless, carbon content in buds and the role of gibberellins produced by seeds as well as the distances at which they could affect floral induction should be further analyzed.
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Affiliation(s)
- Benoît Pallas
- UMR AGAP, Univ Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier Cedex, France
| | - Sylvie Bluy
- UMR AGAP, Univ Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier Cedex, France
| | - Jérôme Ngao
- UMR PIAF, Université Clermont Auvergne, INRA, Clermont Ferrand, France
| | - Sébastien Martinez
- UMR AGAP, Univ Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier Cedex, France
| | - Anne Clément-Vidal
- UMR AGAP, Univ Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier Cedex, France
| | - Jean-Jacques Kelner
- UMR AGAP, Univ Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier Cedex, France
| | - Evelyne Costes
- UMR AGAP, Univ Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier Cedex, France
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Fan S, Zhang D, Zhang L, Gao C, Xin M, Tahir MM, Li Y, Ma J, Han M. Comprehensive analysis of GASA family members in the Malus domestica genome: identification, characterization, and their expressions in response to apple flower induction. BMC Genomics 2017; 18:827. [PMID: 29078754 PMCID: PMC5658915 DOI: 10.1186/s12864-017-4213-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 10/12/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The plant-specific gibberellic acid stimulated Arabidopsis (GASA) gene family is critical for plant development. However, little is known about these genes, particularly in fruit tree species. RESULTS We identified 15 putative Arabidopsis thaliana GASA (AtGASA) and 26 apple GASA (MdGASA) genes. The identified genes were then characterized (e.g., chromosomal location, structure, and evolutionary relationships). All of the identified A. thaliana and apple GASA proteins included a conserved GASA domain and exhibited similar characteristics. Specifically, the MdGASA expression levels in various tissues and organs were analyzed based on an online gene expression profile and by qRT-PCR. These genes were more highly expressed in the leaves, buds, and fruits compared with the seeds, roots, and seedlings. MdGASA genes were also responsive to gibberellic acid (GA3) and abscisic acid treatments. Additionally, transcriptome sequencing results revealed seven potential flowering-related MdGASA genes. We analyzed the expression levels of these genes in response to flowering-related treatments (GA3, 6-benzylaminopurine, and sugar) and in apple varieties that differed in terms of flowering ('Nagafu No. 2' and 'Yanfu No. 6') during the flower induction period. These candidate MdGASA genes exhibited diverse expression patterns. The expression levels of six MdGASA genes were inhibited by GA3, while the expression of one gene was up-regulated. Additionally, there were expression-level differences induced by the 6-benzylaminopurine and sugar treatments during the flower induction stage, as well as in the different flowering varieties. CONCLUSION This study represents the first comprehensive investigation of the A. thaliana and apple GASA gene families. Our data may provide useful clues for future studies and may support the hypotheses regarding the role of GASA proteins during the flower induction stage in fruit tree species.
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Affiliation(s)
- Sheng Fan
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Dong Zhang
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Lizhi Zhang
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Cai Gao
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Mingzhi Xin
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Muhammad Mobeen Tahir
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Youmei Li
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Juanjuan Ma
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Mingyu Han
- College of Horticulture, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
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Ding N, Chen Q, Zhu Z, Peng L, Ge S, Jiang Y. Effects of crop load on distribution and utilization of 13C and 15N and fruit quality for dwarf apple trees. Sci Rep 2017; 7:14172. [PMID: 29074869 PMCID: PMC5658436 DOI: 10.1038/s41598-017-14509-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 10/03/2017] [Indexed: 02/02/2023] Open
Abstract
In order to define the effects of fruit crop load on the distribution and utilization of carbon and nitrogen in dwarf apple trees, we conducted three crop load levels (High-crop load, 6 fruits per trunk cross-sectional area (cm2, TCA)), Medium-crop load (4 fruits cm−2 TCA), Low-crop load (2 fruits cm−2 TCA)) in 2014 and 2015. The results indicated that the 15N derived from fertilizer (Ndff) values of fruits decreased with the reduction of crop load, but the Ndff values of annual branches, leaves and roots increased. The plant 15N-urea utilization rates on Medium and Low-crop load were 1.12–1.35 times higher than the High-crop load. With the reduction of crop load, the distribution rate of 13C and 15N in fruits was gradually reduced, but in contrast, the distribution of 13C and 15N gradually increased in annual branches, leaves and roots. Compared with High-crop load, the Medium and Low-crop load significantly improved fruit quality p < 0.05. Hence, controlling fruit load effectively regulated the distribution of carbon and nitrogen in plants, improved the nitrogen utilization rate and fruit quality. The appropriate crop load level for mature M.26 interstocks apple orchards was deemed to be 4.0 fruits cm−2 TCA.
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Affiliation(s)
- Ning Ding
- State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Qian Chen
- State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Zhanling Zhu
- State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Ling Peng
- State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Shunfeng Ge
- State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Yuanmao Jiang
- State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, Shandong, 271018, China.
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Detection of apple fruit in an orchard for early yield prediction as a function of crop load. ACTA ACUST UNITED AC 2016. [DOI: 10.17660/actahortic.2016.1137.9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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