Ultraviolet lub teeb UV-B yog ib qho tseem ceeb teeb liab molecule, uas plays lub luag haujlwm tseem ceeb hauv kev loj hlob, metabolism thiab kev loj hlob ntawm cov nroj tsuag ntsuab, xws li regulating photomorphogenesis (inhibiting cog elongation, txhawb cotyledon qhib, txhawb flavonoids thiab cyanine Accumulator. ntawm cov ntsiab lus los tiv thaiv kev ntxhov siab, thiab lwm yam). Hauv cov txheej txheem ntawm cov nroj tsuag kov yeej thaj av, lawv tau maj mam hloov txoj hauv kev nyuaj rau kev nkag siab thiab xa UV-B teeb liab. UVR8 (UV RESISTANCE LOCUS 8) tam sim no lub npe hu ua tsuas yog photoreceptor nyob rau hauv cov nroj tsuag ntsuab uas muaj peev xwm paub UV-B hluav taws xob thiab xa UV-B teeb liab. Nws tuaj yeem ua tiav cov txheej txheem ntawm UV-B cov txheej txheem teb los ntawm kev cuam tshuam nrog cov ntsiab lus qis qis. . Txawm li cas los xij, tib neeg tseem muaj kev tsis sib haum xeeb txog keeb kwm thiab evolution keeb kwm ntawm UVR8-kev sib haum xeeb UV-B taw qhia txoj hauv kev hauv cov nroj tsuag.
A few days ago, Professor Zhong Bojian's team from Nanjing Normal University published an online research paper entitled Origin and adaptive evolution of UV RESISTANCE LOCUS 8-mediated signaling during plant terrestrialization in Plant Physiology, which systematically explained the origin and Evolution history. The study clarified the origin groups of different UV-B signaling pathways in plants, and revealed that green plants gradually evolved different UV-B signaling pathways to adapt to the changing UV-B environment of the land.
Cov kws tshawb fawb thawj zaug siv cov kev sib piv genomics thiab phylogenetic txoj hauv kev los tshuaj xyuas cov ntsiab lus tseem ceeb ntawm UV-B signaling txoj hauv kev 79 tus neeg sawv cev cog genomes, thiab pom tias UV-B receptor UVR8 nthuav tawm keeb kwm kev hloov pauv zoo heev. . Cov nqes dej tsis zoo ntawm cov cai tswj hwm thiab cov kev hloov pauv tau nthuav tawm cov kev hloov pauv hloov pauv txawv ntawm cov nroj tsuag ntsuab. Cov classic UVR8-COP1/SPA-HY5-RUP qhia txoj hauv kev hauv cov nroj tsuag yog los ntawm ntsuab algae. Lub hauv paus chiv keeb ntawm txoj kev taw qhia no muab cov nroj tsuag ntsuab muaj peev xwm teb rau UV-B hluav taws xob. Phylogenetic tsom xam pom tias cov ntsiab lus xws li BES1 / BIM1, WRKY36, MYB73 / MYB77 thiab PIFs yog los ntawm chara, thiab MYB13 yog los ntawm pawg poj koob yawm txwv angiosperm.
The study also found evidence related to the adaptation of plants to the strong UV-B environment on land in groups such as green algae, chara, and moss, including positive selection signals in UVR8 and RUPs and an increase in the number of copies of downstream transcription factors. In addition, the use of protein interaction experiments found that UVR8 interacts with BIM1, WRKY36, MYB73/MYB77 in early land plant liverwort, which further supports UVR8-BES1/BIM1, UVR8-WRKY36-HY5 and UVR8-MYB73/MYB77. The guided UV-B signal pathway originated from early land plants. Transcription factors such as BES1/BIM1, WRKY36, MYB73/MYB77 and PIFs are key regulatory elements of the hormone signaling pathway. Studies have shown that the establishment of these UVR8-mediated signaling pathways provides the basis for the connection between UV-B signaling and plant endogenous hormones.
Txhawm rau ua kom tiav, nyob rau hauv cov txheej txheem ntawm cov nroj tsuag terrestrialization, lub classic UVR8-COP1/SPA-HY5-RUP teeb liab txoj kev tau dhau los hloov pauv, uas txhawb nqa cov nroj tsuag ntsuab los ua UV{{ 6}}B teeb liab hloov pauv hauv thaj av muaj zog UV-B ib puag ncig. Physiological teb. Tib lub sijhawm, cov nroj tsuag ntsuab kuj tau hloov pauv ntau yam UV-B teeb liab hloov pauv thiab cuam tshuam nrog cov tshuaj hormones endogenous, nthuav lawv UV-B teeb liab txoj hauv kev, thiab muab lawv hloov mus rau qhov hloov pauv UV -B hluav taws xob ib puag ncig ntawm thaj av. Puag. Qhov kev tshawb fawb no qhia txog keeb kwm thiab kev hloov pauv keeb kwm ntawm cov ntsiab lus tseem ceeb ntawm cov nroj tsuag UV-B teeb liab hloov, thiab muab cov kev siv theoretical rau kev nkag siab tob txog cov txheej txheem molecular ntawm cov nroj tsuag hloov mus rau UV-B kev ntxhov siab.
Dr. Zhang Zhenhua los ntawm Lub Tsev Kawm Ntawv ntawm Kev Tshawb Fawb Txog Lub Neej, Nanjing Normal University yog thawj tus kws sau ntawv, thiab xibfwb Zhong Bojian yog tus kws sau ntawv. Cov kws kho mob sib tw Shi Chen thiab Liu Hongtao los ntawm lub koom haum ntawm tsob nroj Physiology thiab Ecology, Shanghai Institutes rau Biological Sciences, Suav Academy ntawm Sciences, tau koom nrog hauv kev tshawb fawb ua haujlwm. Qhov kev tshawb fawb no tau txais nyiaj los ntawm National Natural Science Foundation ntawm Tuam Tshoj thiab Cov Khoom Zoo Tshaj Plaws ntawm Jiangsu Xeev.
