Water relations in winter: effect on bud break of walnut tree.

Améglio, Thierry; Guilliot, Agnès; Lacointe, André; Julien, Jean-Louis; Alves, Givago Lopes; Valentin, V.; Pétel, Gilles; Viémont, Jean-Daniel; Crabbé, J.

doi:10.1079/9780851994475.0109

Cited by 13 publications

(13 citation statements)

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“…More recently, it has been described at the within-stem tissue level (wood versus bark) in Hevea brasiliensis (Chatuma et al 2009), where the bark sucrose pool, which was closest to the main sink, was interpreted as a ready-to-use intermediate compartment. In the apical part of the stem, the dynamics of sucrose and starch in buds were close to the dynamics observed previously in the bulk stem tissue (Lacointe et al 1995, Ameglio et al 2000. Concerning the sucrose dynamics in buds, the increase was observed only in February, after endodormancy release.…”

Section: Carbohydrate Contentssupporting

confidence: 85%

Carbohydrate uptake from xylem vessels and its distribution among stem tissues and buds in walnut (Juglans regia L.)

Bonhomme¹,

Peuch²,

Améglio³

et al. 2009

Tree Physiology

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Bud break pattern is a key determinant of tree architecture. The mechanisms leading to the precedence of certain buds over the others are not yet fully explained, but the availability of soluble sugars may play a significant role, especially those in the xylem sap at the onset of the growing period. Here, we measured carbon availability in the different tissues (bud, xylem and bark). To assess the capacity of buds to use the xylem sap carbohydrates, the fluxes between xylem vessels and parenchyma cells, bark and buds of walnut (Juglans regia cv 'Franquette') were measured during the rest period until bud break. This uptake capacity varies according to the temperature, the sugar and the position on the branch of the fragment studied. Between December and March, in xylem tissues, the active component of sucrose uptake was predominant compared with diffusion (90% of the total uptake), whereas the active component accounted for more moderate amounts in buds (50% of the uptake). The active uptake of hexoses took place belatedly (April) in xylem. The flow rates between xylem vessels and buds increased 1 month before bud break and reached 2000 microg sucrose h(-)(1) g DW(-)(1). Fluxes seemed to depend on bud position on the branch. However, this study strongly suggests that they were mainly dependent on the sink strength of the buds and on the sink competition between bud, xylem parenchyma and bark.

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Section: Carbohydrate Contentssupporting

confidence: 85%

Carbohydrate uptake from xylem vessels and its distribution among stem tissues and buds in walnut (Juglans regia L.)

Bonhomme¹,

Peuch²,

Améglio³

et al. 2009

Tree Physiology

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“…Generally, sugar transport is thought to occur via H + /sugar symports that depend on a pH gradient generated by a plasma membrane H + -ATPase [53]. Gevaudant et al (2001) examined expression of the four H + -ATPase genes and reported that the levels of three H + -ATPase gene mRNAs increased, whereas the level of one H + -ATPase gene decreased in vegetative buds of peach trees after dormancy release [54].…”

Section: Discussionmentioning

confidence: 99%

Transcriptomic analysis of ‘Suli’ pear (Pyrus pyrifolia white pear group) buds during the dormancy by RNA-Seq

et al. 2012

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BackgroundBud dormancy is a critical developmental process that allows perennial plants to survive unfavorable environmental conditions. Pear is one of the most important deciduous fruit trees in the world, but the mechanisms regulating bud dormancy in this species are unknown. Because genomic information for pear is currently unavailable, transcriptome and digital gene expression data for this species would be valuable resources to better understand the molecular and biological mechanisms regulating its bud dormancy.ResultsWe performed de novo transcriptome assembly and digital gene expression (DGE) profiling analyses of ‘Suli’ pear (Pyrus pyrifolia white pear group) using the Illumina RNA-seq system. RNA-Seq generated approximately 100 M high-quality reads that were assembled into 69,393 unigenes (mean length = 853 bp), including 14,531 clusters and 34,194 singletons. A total of 51,448 (74.1%) unigenes were annotated using public protein databases with a cut-off E-value above 10-5. We mainly compared gene expression levels at four time-points during bud dormancy. Between Nov. 15 and Dec. 15, Dec. 15 and Jan. 15, and Jan. 15 and Feb. 15, 1,978, 1,024, and 3,468 genes were differentially expressed, respectively. Hierarchical clustering analysis arranged 190 significantly differentially-expressed genes into seven groups. Seven genes were randomly selected to confirm their expression levels using quantitative real-time PCR.ConclusionsThe new transcriptomes offer comprehensive sequence and DGE profiling data for a dynamic view of transcriptomic variation during bud dormancy in pear. These data provided a basis for future studies of metabolism during bud dormancy in non-model but economically-important perennial species.

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“…Sugar influx in the bud is generally considered to occur via H + /sugar symports depending on the pH gradient generated by a plasma membrane H + -ATPase (Améglio et al, 2000). In this study, a putative plasma membrane H + -ATPase gene was highly expressed during the dormancy transition (ExP 3).…”

Section: Genes Associated With Sugar Metabolismmentioning

confidence: 95%

Co-ordinated gene expression during phases of dormancy release in raspberry (Rubus idaeus L.) buds

Mazzitelli¹,

Hancock²,

Haupt³

et al. 2007

Journal of Experimental Botany

189

179

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Bud break in raspberry (Rubus idaeus L.) is often poor and uneven, with many of the subapical buds remaining in a dormant state. In order to determine the dormancy status of raspberry buds, an empirical measure of bud burst in a growth-permissive environment following exposure to chilling (4 degrees C cold storage) was developed. For cv. Glen Ample, percentage bud burst in intact canes and isolated nodes was recorded after 14 d. Isolated nodes (a measure of endodormancy) achieved 100% bud burst after approximately 1500 h chilling whereas buds on intact plants (combined endo- and paradormancy) required an additional 1000 h chilling. A microarray approach was used to follow changes in gene expression that occurred during dormancy transition. The probes for the microarrays were obtained from endodormant and paradormant raspberry bud cDNA libraries. The expression profiles of 5300 clones from these libraries were subjected to principal component analysis to determine the most significant expression patterns. Sequence analysis of these clones, in many cases, enabled their functional categorization and the development of hypotheses concerning the mechanisms of bud dormancy release. Thus a set of novel candidates for key dormancy-related genes from raspberry buds have been identified. Bud dormancy is fundamental to the study of plant developmental processes and, in addition, its regulation is of significant economic importance to fruit and horticultural industries.

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Water relations in winter: effect on bud break of walnut tree.

Cited by 13 publications

References 0 publications

Carbohydrate uptake from xylem vessels and its distribution among stem tissues and buds in walnut (Juglans regia L.)

Carbohydrate uptake from xylem vessels and its distribution among stem tissues and buds in walnut (Juglans regia L.)

Transcriptomic analysis of ‘Suli’ pear (Pyrus pyrifolia white pear group) buds during the dormancy by RNA-Seq

Co-ordinated gene expression during phases of dormancy release in raspberry (Rubus idaeus L.) buds

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