Quantitative trait loci affecting reproductive phenology in peach

Background: The reproductive phenology of perennial plants in temperate climates is largely conditioned by the duration of bud dormancy, and fruit developmental processes. Bud dormancy release and bud break depends on the perception of cumulative chilling and heat during the bud development. The objective of this work was to identify new quantitative trait loci (QTLs) associated to temperature requirements for bud dormancy release and flowering and to fruit harvest date, in a segregating population of peach. Results: We have identified QTLs for nine traits related to bud dormancy, flowering and fruit harvest in an intraspecific hybrid population of peach in two locations differing in chilling time accumulation. QTLs were located in a genetic linkage map of peach based on single nucleotide polymorphism (SNP) markers for eight linkage groups (LGs) of the peach genome sequence. QTLs for chilling requirements for dormancy release and blooming clustered in seven different genomic regions that partially coincided with loci identified in previous works. The most significant QTL for chilling requirements mapped to LG1, close to the evergrowing locus. QTLs for heat requirement related traits were distributed in nine genomic regions, four of them co-localizing with QTLs for chilling requirement trait. Two major loci in LG4 and LG6 determined fruit harvest time. Conclusions: We identified QTLs associated to nine traits related to the reproductive phenology in peach. A search of candidate genes for these QTLs rendered different genes related to flowering regulation, chromatin modification and hormone signalling. A better understanding of the genetic factors affecting crop phenology might help scientists and breeders to predict changes in genotype performance in a context of global climate change.We thank Matilde Gonzalez for technical assistance. 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The peach volatilome modularity is reflected at the genetic and environmental response levels in a QTL mapping population

Background: The improvement of fruit aroma is currently one of the most sought-after objectives in peach breeding programs. To better characterize and assess the genetic potential for increasing aroma quality by breeding, a quantity trait locus (QTL) analysis approach was carried out in an F-1 population segregating largely for fruit traits. Results: Linkage maps were constructed using the IPSC peach 9 K Infinium (R) II array, rendering dense genetic maps, except in the case of certain chromosomes, probably due to identity-by-descent of those chromosomes in the parental genotypes. The variability in compounds associated with aroma was analyzed by a metabolomic approach based on GC-MS to profile 81 volatiles across the population from two locations. Quality-related traits were also studied to assess possible pleiotropic effects. Correlation-based analysis of the volatile dataset revealed that the peach volatilome is organized into modules formed by compounds from the same biosynthetic origin or which share similar chemical structures. QTL mapping showed clustering of volatile QTL included in the same volatile modules, indicating that some are subjected to joint genetic control. The monoterpene module is controlled by a unique locus at the top of LG4, a locus previously shown to affect the levels of two terpenoid compounds. At the bottom of LG4, a locus controlling several volatiles but also melting/non-melting and maturity-related traits was found, suggesting putative pleiotropic effects. In addition, two novel loci controlling lactones and esters in linkage groups 5 and 6 were discovered. Conclusions: The results presented here give light on the mode of inheritance of the peach volatilome confirming previously loci controlling the aroma of peach but also identifying novel ones.GS has financial support from INTA (Instituto Nacional de Tecnologia Agropecuaria, Argentina). HS-SPME-GC-MS analyses were performed at the Metabolomic lab facilities at the IBMCP (CSIC) in Spain. This project has been funded by the Ministry of Economy and Competitivity grant AGL2010-20595.Sánchez, G.; Martinez, J.; Romeu, J.; Garcia, J.; Monforte Gilabert, AJ.; Badenes, M.; Granell Richart, A. (2014). The peach volatilome modularity is reflected at the genetic and environmental response levels in a QTL mapping population. BMC Plant Biology. 14(137):1-16. https://doi.org/10.1186/1471-2229-14-137S11614137Klee, H. J., & Giovannoni, J. J. (2011). Genetics and Control of Tomato Fruit Ripening and Quality Attributes. 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Elaboració d'una guia sobre aprenentatge cooperatiu a la Universitat de Girona

L’any 2009, l’Institut de Ciències de l’Educació Josep Pallach de la Universitat de Girona va impulsar la creació de diverses Xarxes d’Innovació Docent (XID). Aquestes xarxes agrupen professors de disciplines diverses que volen compartir experiències relatives a la millora docent. Una d’aquestes xarxes és la relativa a l’Aprenentatge Cooperatiu (XIDAC). Es compon de vuit professors que utilitzen aquest mètode d’aprenentatge a la seva docència. Un dels seus objectius és produir una guia o petit manual sobre aprenentatge cooperatiu (AC) a la UdG. Es tracta d’orientar els professors que vulguin posar- lo en pràctica, o que ja ho estiguin fent i necessitin un material de suport. A la present comunicació es descriu el procés d’elaboració d’aquesta guia. En primer lloc, s’exposen característiques de la UdG que poden determinarne en algun sentit el perfil i continguts. Després, es resumeixen els resultats d’entrevistes amb professors que apliquen l’AC tot i no pertànyer a la Xarxa. A continuació, es resumeixen els resultats d’una enquesta elaborada al professorat de la UdG (actualment està en fase de resposta). Amb posterioritat, es fa una presentació general de la futura guia i es descriu breument un exemple de fitxa d’activitat d’AC. Finalment, es fa referència al procés de debat obert de part d’aquests continguts a través d’una pàgina web, per tal de recollir punts de vista externs i millorar la proposta.Peer Reviewe

Gene expression analysis of chilling requirements for flower bud break in peach

With 2 figures and 2 tables Dormancy has been defined as the inability to initiate growth from meristem under favourable environmental conditions. The length of dormancy is a genotype-specific trait that limits the climatic adaptability of temperate crops, as peach. A better knowledge of the genes involved in dormancy may provide genetic tools for an early assessment of the trait in breeding programmes. Recent studies on the molecular aspects of dormancy provided an initial description of candidate genes involved in bud dormancy maintenance and release in peach. In this paper, we compare the chilling requirement for dormancy release of five peach cultivars with the expression of five genes and ESTs related to bud dormancy: DAM5, DB396 (ppa007606m), DB247 (ppa012188m), SB280 (ppa006974m) and PpB63 (ppa008309m). Results indicated that gene expression analysis could contribute to estimate the chilling requirement for dormancy release of new cultivars. \ua9 2012 Blackwell Verlag GmbH

Elaboració d'una guia sobre aprenentatge cooperatiu a la Universitat de Girona

L’any 2009, l’Institut de Ciències de l’Educació Josep Pallach de la Universitat de Girona va impulsar la creació de diverses Xarxes d’Innovació Docent (XID). Aquestes xarxes agrupen professors de disciplines diverses que volen compartir experiències relatives a la millora docent. Una d’aquestes xarxes és la relativa a l’Aprenentatge Cooperatiu (XIDAC). Es compon de vuit professors que utilitzen aquest mètode d’aprenentatge a la seva docència. Un dels seus objectius és produir una guia o petit manual sobre aprenentatge cooperatiu (AC) a la UdG. Es tracta d’orientar els professors que vulguin posar- lo en pràctica, o que ja ho estiguin fent i necessitin un material de suport. A la present comunicació es descriu el procés d’elaboració d’aquesta guia. En primer lloc, s’exposen característiques de la UdG que poden determinarne en algun sentit el perfil i continguts. Després, es resumeixen els resultats d’entrevistes amb professors que apliquen l’AC tot i no pertànyer a la Xarxa. A continuació, es resumeixen els resultats d’una enquesta elaborada al professorat de la UdG (actualment està en fase de resposta). Amb posterioritat, es fa una presentació general de la futura guia i es descriu breument un exemple de fitxa d’activitat d’AC. Finalment, es fa referència al procés de debat obert de part d’aquests continguts a través d’una pàgina web, per tal de recollir punts de vista externs i millorar la proposta.Peer Reviewe