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| 1 | Thermal-responsive genetic and epigenetic regulation of DAM cluster controlling dormancy and chilling requirement in peach floral buds显示文摘The Dormancy-associated MADS-box(DAM)gene cluster in peach serves as a key regulatory hub on which the seasonal temperatures act and orchestrate dormancy onset and exit,chilling response and floral bud developmental pace.Yet,how different temperature regimes interact with and regulate the six linked DAM genes remains unclear.Here,we demonstrate that chilling downregulates DAM1 and DAM3–6 in dormant floral buds with distinct patterns and identify DAM4 as the most abundantly expressed one.We reveal multiple epigenetic events,with tri-methyl histone H3 lysine 27(H3K27me3)induced by chilling specifically in DAM1 and DAM5,a 21-nt sRNA in DAM3 and a ncRNA induced in DAM4.Such induction is inversely correlated with downregulation of their cognate DAMs.We also show that the six DAMs were hypermethylated,associating with the production of 24-nt sRNAs.Hence,the chilling-responsive dynamic of the different epigenetic elements and their interactions likely define distinct expression abundance and downregulation pattern of each DAM.We further show that the expression of the five DAMs remains steadily unchanged or continuously downregulated at the ensuing warm temperature after chilling,and this state of regulation correlates with robust increase of sRNA expression,H3K27me3 and CHH methylation,which is particularly pronounced in DAM4.Such robust increase of repressive epigenetic marks may irreversibly reinforce the chillingimposed repression of DAMs to ensure flower-developmental programming free from any residual DAM inhibition.Taken together,we reveal novel information about genetic and epigenetic regulation of the DAM cluster in peach,which will be of fundamental significance in understanding of the regulatory mechanisms underlying chilling requirement and dormancy release,and of practical application for improvement of plasticity of flower time and bud break in fruit trees to adapt changing climates. | Hong Zhu Pao-Yang Chen Silin Zhong Chris Dardick Ann Callahan Yong-Qiang An Steve van Knocker Yingzhen Yang Gan-Yuan Zhong Albert Abbott Zongrang Liu | 2020 | Horticulture Research2020，7，1： | 9 |
| 2 | Genetic characterization of worldwide Prunus domestica(plum)germplasm using sequence-based genotyping显示文摘Prunus domestica commonly known as European plum is a hexaploid fruit tree species cultivated around the world.Locally it is used for fresh consumption,in jams or jellies,and the production of spirits while commercially the fruit is primarily sold dried(prunes).Despite its agricultural importance and long history of cultivation,many questions remain about the origin of this species,the relationships among its many pomological types,and its underlying genetics.Here,we used a sequence-based genotyping approach to characterize worldwide plum germplasm including the potential progenitor Eurasian plum species.Analysis of 405 DNA samples established a set of four clades consistent with the pomological groups Greengages,Mirabelles,European plums,and d’Agen(French)prune plums.A number of cultivars from each clade were identified as likely clonal selections,particularly among the“French”type prune germplasm that is widely cultivated today.Overall,there was relatively low genetic diversity across all cultivated plums suggesting they have been largely inbred and/or derived from a limited number of founders.The results agree with P.domestica having originated as an interspecific hybrid of a diploid P.cerasifera and a tetraploid P.spinosa that itself may have been an interspecific hybrid of P.cerasifera and an unknown Eurasian plum species.The low genetic diversity and lack of true wild-types coupled with the known cultivation history of Eurasian plums imply that P.domestica may have been a product of inter-specific cross breeding and artificial selection by early agrarian Eurasian societies. | Tetyana Zhebentyayeva Vijay Shankar Ralph Scorza Ann Callahan Michel Ravelonandro Sarah Castro Theodore DeJong Christopher A.Saski Chris Dardick | 2019 | Horticulture Research2019，6，1： | 4 |
| 3 | Induce of chitinase, fl- 1,3- glucanase, andphenylalanine ammonia lyase in peach fruit by UV-C t~eatment显示文摘 | Ahmed E I Ghaouth Charles L Wilson Ann M Callahan | 2003 | Phytopathology J2003，93，3： | 1 |
| 4 | Slone for -mation in peach fruit exhibits spatial coordination of the lignin and fla-vonoid pathways and similarity to Arabidopsis dehiscencc显示文摘 | Dardick Christopher Callahan Ann Chiozzotto Remo | 2010 | BMC Bi-ology2010，8，1： | 1 |
| 5 | Post-transcriptional gene silencing in plum pox virus resistant transgenic European plum containing the plum pox potyvirus coat protein gene显示文摘 | Ralph Scorza Ann Callahan Laurene Levy Vern Damsteegt Kevin Webb Michel Ravelonandro | 2001 | Transgenic Research2001，，3： | 1 |
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