Muva nje, uSolwazi Chunxiang You wase-Shandong Agricultural University kanye nozakwabo bashicilele indatshana yokubuyekeza enesihloko esithi “Ukulawulwa kokuvuthwa kwezithelo eziyinyama: kusuka ku-transcription factor kuya ekuguqulweni kwe-epigenetic” Ucwaningo Lwezolimo.
“Kulokhu kubuyekezwa, sidingida ulwazi lwamanje lwe izici zokuloba elawula ukuvuthwa ngokuhambisana ne-ethylene kanye nezimpawu zemvelo (ukukhanya nezinga lokushisa) kumodeli wesitshalo sikatamatisi (i-Solanum lycopersicum) nezinye izithelo ezinomzimba. Sigcizelela izindima ezibalulekile zokulawulwa kwe-epigenetic, ”kusho ababhali.
I-Ethylene yenza indlela yokusayina ehlelwe kahle exhumanisa ukukhula kwezitshalo kanye nokukhula nokuvuthwa kwezithelo, kanye nobufakazi obuningi buphakamisa ukuthi i-ethylene, kanye namanye amahomoni ezitshalo angapheli, asebenza nama-TF ahlobene nokuvuthwa ukuze alawule ngokuhlanganyela ukuvuthwa kwezithelo. Leli phepha libuyekeza izindlela zamamolekyuli zama-TF alawula ukuvuthwa kwezithelo ngendlela encike ethylene kanye/noma -ezimele.
Uma sithatha utamatisi njengesibonelo, ama-TF afana nama-NAC, NOR, MOR-like1, HB-1, WRKY1, GRAS4/38, ARF2A/2B, kanye ne-AREB alawula ukuvezwa kwe-ethylene kanye nezakhi zofuzo ezihlobene nokuvuthwa ngendlela encike ethylene, ngaleyo ndlela ilawula kahle ukuvuthwa kwezithelo. Ukuqoqwa kanye nokuwohloka kwe-chlorophyll ngesikhathi sokuvuthwa kukatamatisi kulawulwa ama-TF ahlukahlukene, okuhlanganisa i-GLK1/2, ARFs, ne-TKN2/4, ngendlela engaxhomekeki ku-ethylene, futhi le nqubo iphinde ishintshwe ngokuhambisana kwamahomoni nezimpawu zokukhanya. . I-MADS-box TFs (RIN, FUL1/2, TAGL1) kanye ne-ethylene kuhlanganisa umjikelezo olawulayo olawula ukuvuthwa kwezithelo i-ethylene-indlela encike futhi ezimele.
Ucwaningo lwakamuva lubonise ukuthi ukuguqulwa kwe-epigenetic nakho kudlala indima ebalulekile ekuvuthweni kwezithelo. I-DNA methylation, i-histone methylation, ne-acetylation yizona zinguquko ezinkulu ze-epigenetic ezithonya ukuvuthwa kwezithelo, phakathi kwazo i-DNA methylation kanye ne-H3K27me3 histone methylation okungamamaki e-epigenetic acindezelayo. N6-methyladenosine (m6A) iwukuguqulwa okuvame kakhulu kwe-mRNA kuma-eukaryote, futhi ucwaningo lwakamuva luye lwembula a impendulo ye-loop phakathi kwe-m6Ukuguqulwa kwe-mRNA kanye ne-DNA methylation elawula ukuvuthwa kwesithelo sikatamatisi.
Sengiphetha, ababhali babuyekeza imodeli yokusebenza ye-phytohormones, ama-TF ahlobene nokuvuthwa, kanye izinguquko ze-epigenetic ngokulawulwa okuguquguqukayo kokuvuthwa kwesithelo sikatamatisi, okuthi, njengoba ababhali besho, “okungase kube umhlahlandlela lapho kufundwa izindlela ezilawula ukuvuthwa kwezinye izinhlobo zezithelo,” futhi “kuqondise amasu amasha okusebenza kwawo ngempumelelo.”
Umthombo: https://phys.org