I-Virology Yezitshalo Zanamuhla
I-virology yezitshalo yanamuhla iyigatsha lesayensi elifunda amagciwane athelela izitshalo, izindlela zawo zokudlulisela, ukusebenzisana kwawo nabantu abawamukelayo, kanye namasu okulawula asebenzayo naqhubekayo. Esikhathini sezolimo ezijulile, ukuguquka kwesimo sezulu, kanye nokuhamba kwezinto zokutshala kuzo zonke izifunda, izifo ezibangelwa amagciwane ezitshalweni ziyingozi enkulu ngoba zivame ukubangela ukulahlekelwa okukhulu, kunzima ukuzelapha uma sezithelelekile, futhi izimpawu zazo zivame ukufana nokuntuleka kwezakhamzimba noma ukucindezeleka kwemvelo. Intuthuko ku-biology yamangqamuzana, i-genomics, kanye nobuchwepheshe bokuxilonga okusheshayo ishintshe i-virology yezitshalo kusukela ekutholeni izimpawu kuya ekuqondeni izindlela zokutheleleka kanye nokuklama amasu okuphatha izifo aqondile.
Amagciwane ezitshalo kanye nokuhlukile kwawo
Ama-virus ezitshalo ngokuvamile ayizinhlayiya ezincane ezithwala izinto zofuzo ngesimo se-RNA noma i-DNA, zizungezwe yi-capsid yephrotheni, kanti kwezinye izinhlobo, kukhona okunye okwengeziwe. Ngokungafani nesikhunta noma amabhaktheriya, ama-virus awakwazi ukuzala ngaphandle kweseli eliyibambayo. Ngemva kokungena ezicutshini zezitshalo, igciwane "lihlasela" imishini yeselula ukuze liphindaphinde i-genome yalo futhi lakhe izinhlayiya ezintsha zama-virus. Esinye isici esiyingqayizivele sama-virus ezitshalo yikhono lawo lokuhamba phakathi kwamaseli nge-plasmodesmata—iziteshi ezincane ezixhumanisa amaseli—futhi zisakazeke ngokuhlelekile nge-phloem. Ngakho-ke, iphuzu elilodwa lokutheleleka eqabungeni lingakhula libe yisifo sesitshalo esigcwele ngesikhathi esifushane.
Amagciwane ezitshalo ayiqembu elihlukahlukene kakhulu. Amaningi anama-genome e-RNA angenantambo eyodwa, njenge-Potyviruses (isb., amagciwane e-mosaic ezitshalo ezahlukahlukene) noma ama-Tobamoviruses (isibonelo esivamile yi-Tobacco mosaic virus/TMV). Kukhona futhi amagciwane e-DNA, njenge-Geminivirus, evame ukubangela ukugoba kwamaqabunga futhi iyinkinga enkulu kutamatisi, upelepele, kanye nokotini ezindaweni ezishisayo. Lokhu kuhlukahluka kuthonya izindlela zokudlulisela, ukuzinza kwamagciwane endaweni ezungezile, kanye namasu okulawula.
Izimpawu kanye nomthelela wazo ekukhiqizweni
Izimpawu zokutheleleka ngegciwane lezitshalo zingafaka phakathi i-mosaic (amabala aluhlaza okotshani), i-chlorosis, amabala, ukugoba kwamaqabunga, ukuqina, i-necrosis, amabala ayindilinga, ngisho nokuguquka kwezithelo. Kwezinye izimo, ukutheleleka ngegciwane akubangeli izimpawu ezisobala (ezicashile) kodwa kunciphisa isivuno noma ikhwalithi. Umthelela ungaba mkhulu: isisindo sezithelo esinciphile, usayizi we-tuber, ikhwalithi yefayibha, kanye nesikhathi sokuphelelwa yisikhathi esinciphile. Ezitshalweni zezitshalo ezibiza kakhulu njenge-chilies, utamatisi, ukhukhamba, ubhanana, noma ama-orchid, ukulahlekelwa kwezomnotho akubangelwa nje kuphela inani lesivuno kodwa futhi nokwenqatshwa kwemakethe ngenxa yokubukeka okubi.
Inselele enkulu ngezifo ezibangelwa amagciwane ukuntuleka "komuthi" wokwelapha ongabulala igciwane ngaphakathi kwesitshalo ngaphandle kokulimaza isitshalo uqobo. Ngakho-ke, ukugxila okuyinhloko kokuphatha ukuvimbela, ukutholakala kusenesikhathi, kanye nokuphazamiseka kochungechunge lokudlulisela.
Indlela yokudlulisela: izithwali, imbewu, nezinto zokutshala
I-virology yezitshalo zanamuhla igcizelela kakhulu i-epidemiology: indlela amagciwane asakazeka ngayo ensimini. Ukudluliselwa kuvame kakhulu ngezinambuzane ezithwala izinambuzane, ikakhulukazi ama-aphid, izimpukane ezimhlophe (i-Bemisia tabaci), ama-thrips, izimpungushe zamaqabunga, kanye nezinye izimbungulu. I-vector ngayinye inendlela ehlukile yokudlulisela. Isibonelo, amanye amagciwane adluliselwa ngaphandle kokuphikelela: isinambuzane sidinga kuphela "ukunambitha" okufushane kwezicubu ukuze sithathe futhi sidlulise igciwane. Lokhu kwenza ama-insecticide angasebenzi, njengoba igciwane selivele lidluliselwe ngaphambi kokuba isinambuzane sife. Ngokuphambene nalokho, amagciwane anokudluliselwa okuqhubekayo adinga isikhathi eside sokutholwa futhi angaqhubeka emzimbeni we-vector, okwenza ukuphathwa kwe-vector kube okubaluleke kakhulu.
Ama-virus angathwalwa futhi ngembewu noma ngezinto zokutshala zezitshalo ezifana nokusikwa, ukuxhunyelelwa, izimila, ama-rhizome, kanye nezitshalo zezicubu ezingabulawanga amagciwane. Ezitshalweni ezifana namazambane, ubhanana, umoba, kanye nezitshalo ezahlukahlukene zokuhlobisa, ukuhamba kwezinto zokutshala ezinegciwane kuyindlela eyinhloko yokudlulisela phakathi kwezifunda. Ngaphezu kwalokho, amanye ama-virus azinzile kakhulu futhi angadluliselwa ngamathuluzi ezolimo, ukuthintana ngomshini, noma udoti wezitshalo.
Ukuxilongwa kwesimanje: kusukela ezimpawini kuya ku-genome
Esikhathini esidlule, ukuhlonza igciwane kwakuvame ukuthembela ezimpawini, ezitshalweni ezibonisa izimpawu, noma kuma-electron microscopy. Namuhla, i-virology yezitshalo ithuthuka ngokushesha ngokuxilongwa okusekelwe kuma-molecule. Indlela ye-ELISA (Enzyme-Linked Immunosorbent Assay) isasetshenziswa kabanzi ngenxa yokungabizi kwayo kanye nokufaneleka kwayo ekuhlolweni. Kodwa-ke, ukunemba okukhulu kanye nokuzwela kutholakala nge-PCR/RT-PCR, qPCR, kanye ne-LAMP (Loop-mediated Isothermal Amplification), okungenziwa ngokushesha futhi ngezinye izikhathi kufaneleka kakhulu ukusetshenziswa ensimini.
Ushintsho olukhulu luvela kubuchwepheshe be-next-generation sequencing (NGS). Nge-NGS, abacwaningi bangathola amagciwane ngaphandle kokwazi kuqala ukuthi ahloselwe ini. Lokhu kubalulekile ekutholeni amagciwane amasha, ukuhlonza izifo ezixubile, kanye nokuhlela ukuhlukahluka kwezakhi zofuzo zegciwane okuhlobene nokuba yingozi kanye nokugwema ukumelana. Idatha ye-genomic iphinde isekele i-molecular epidemiology, okuvumela ukuhlukaniswa okusekelwe ebufakazini kanye nezinqubomgomo zokuqinisekisa imbewu.
Ukuxhumana phakathi kwamagciwane nezitshalo: ukuzivikela kwamagciwane namasu
Izitshalo azizona izidalwa ezingenzi lutho. Zinezivikelo ezakhelwe ngaphakathi, okuhlanganisa nokuthulisa i-RNA—indlela eqaphela i-RNA yangaphandle bese iyibhubhisa. Amagciwane amaningi ezitshalo athuthukise amaprotheni okucindezela ukuthulisa ukuze akhubaze lezi zivikelo. Umjaho wokuziphendukela kwemvelo phakathi kwamagciwane nezitshalo ubumba ukuguquguquka kwezifo ensimini: izinhlobo ezimelana nezifo zingaba sengozini uma igciwane lishintsha libe izinhlobo ezintsha.
Ukuqonda lokhu kusebenzisana kwama-molecule kuyisisekelo se-virology yesimanje, njengoba kuvula indlela yobunjiniyela bokumelana: kokubili ngokukhetha okuvamile okusizwa amamaki kanye nezindlela ze-biotechnology.
Amasu okulawula ahlanganisiwe enkathini yanamuhla
Ngenxa yokuthi izifo ezibangelwa amagciwane kunzima ukuzelapha, amasu esimanje agcizelela ukuphathwa kwezinambuzane okuhlanganisiwe (i-IPM) okuqondene namagciwane. Izingxenye zayo eziyinhloko zifaka:
1. Izinto zokutshala ezinempilo neziqinisekisiwe
Ukusebenzisa imbewu engenamagciwane noma izithombo zokukhulisa izicubu ezihlolwe kusetshenziswa izindlela zokuxilonga. Isitifiketi siyisihluthulelo semikhiqizo etshalwe ngezitshalo.
2. Ukuhlanzeka kanye nokuqeda
Siphula futhi ubhubhise izitshalo ezinezimpawu kusenesikhathi (ukususa ukhula oluvela ku-germ), susa ukhula oluvela ku-germ, bese uhlanza amathuluzi ukuze uvimbele ukudluliselwa kwemishini.
3. Ukuphathwa kwe-vector okusekelwe emvelweni
Ukusetshenziswa kwe-mulch ekhanyayo ukuphazamisa ukuqondiswa kwe-aphid/izimpukane ezimhlophe, ukufakwa kwezicupho eziphuzi, izikhala zezitshalo, ukutshala izithiyo, kanye nokukhululwa kwezitha zemvelo. Izibulala-zinambuzane zisetshenziswa ngokukhetha nangesikhathi esifanele ukuvimbela ukumelana nokugcina izitha zemvelo.
4. Izinhlobo ezimelana nokuqina kanye nokuzalanisa ngokunemba
Izinhlobo ezinezakhi zofuzo ezithile zokumelana noma ukumelana ngobuningi zinganciphisa ingozi yezifo eziwumshayabhuqe. Ukuzalanisa okusekelwe ku-genome kusheshisa ukukhethwa.
5. Isikhathi sokutshala nokulungisa igadi
Ukutshala ngezikhathi lapho kunezinhlobo ezincane zezitshalo, ukushintshaniswa kwezitshalo, kanye nokuphathwa kwe-mosaic yezitshalo endaweni kungaphula umjikelezo wesifo.
Ubuchwepheshe obusha: i-CRISPR, i-RNAi, kanye nokutholwa kwensimu
I-virology yezitshalo zanamuhla ihlanganisa nezinto ezintsha ezifana nokuphazamiseka kwe-RNA (i-RNAi) ukuvimbela ukuphindaphinda kwegciwane ngokuvezwa kwe-RNA eqondiwe. Okwamanje, i-CRISPR ivula izindlela ezimbili: (1) ukuhlela izakhi zofuzo zezitshalo ezidingekayo ukuze kuphindaphindwe igciwane ukuze izitshalo zimelane kakhulu, kanye (2) kwamanye amagciwane e-DNA, uhlelo lwe-CRISPR lungaqondiswa ekunqumeni i-genome yegciwane. Nakuba kuthembisa, lezi zindlela zidinga ukuhlolwa kokuphepha kwe-bio, ukuzinza kwesikhathi eside, kanye nokwamukelwa komthetho.
Ngasohlangothini lokuxilonga, amadivayisi aphathekayo asekelwe ku-LAMP, ama-biosensor, ngisho nama-sequencer amancane (njenge-nanopores) aqala ukuvumela ukutholakala okusheshayo ensimini. Lokhu kubalulekile ekuphenduleni kusenesikhathi ngaphambi kokuba ukuqubuka kusakazeke, ikakhulukazi ezindaweni zokukhiqiza izitshalo ezinezitshalo ezishintsha ngokushesha.
Izinselele zesikhathi esizayo
Ezinye zezinselelo ezibalulekile ezibhekene ne-virology yezitshalo esikhathini esizayo ukwanda kokusabalala kwamagciwane ngenxa yokuhweba komhlaba wonke, ukuvela kwezinhlobo ezintsha ngokuguqulwa kwezakhi zofuzo kanye nokuhlangana kabusha, kanye nokushintsha kwesimo sezulu, okwandisa ububanzi bezifo ezithwala izifo. Ngaphezu kwalokho, ukutheleleka okuxubile okubandakanya amagciwane amaningi kungenza izimpawu zibe zimbi kakhulu futhi kube nzima ukuxilongwa. Izinselele zezenhlalo nezomnotho nazo zibalulekile: abalimi badinga izixazululo ezingokoqobo, ezingabizi, futhi ezilungiselelwe izimo zendawo.
I-Penutup
I-virology yezitshalo zanamuhla ayigcini nje ngokuthi "yimaphi amagciwane ahlasela izitshalo," kodwa futhi imayelana nokuqonda izindlela zokutheleleka, ukumaka ukuhamba kwegciwane ezingeni le-genomic, kanye nokuklama izinhlelo zokulima ezivimbela ukuqubuka kwasekuqaleni. Ukuhlanganiswa kokuxilongwa okusheshayo, ukuzalanisa okumelana, ukuphathwa kwe-vector okuhlakaniphile, kanye nezinqubomgomo zokuhlukaniswa kanye nokuqinisekiswa kwezinto zokutshala kuyisisekelo esibalulekile. Ngezindlela zesayensi eziqondile ngokwengeziwe kanye nokubambisana okuqinile phakathi kwabacwaningi, abasebenzi bezokwandisa, imboni yembewu, kanye nabalimi, ukulahlekelwa yizifo ezibangelwa amagciwane kungancishiswa, ngenkathi kuqinisekiswa ukuvikeleka kokudla kanye nokusimama kwezolimo esikhathini esizayo.
