Ma Virology a Zomera Zamakono
Sayansi yamakono ya zomera ndi nthambi ya sayansi yomwe imaphunzira mavairasi omwe amapatsira zomera, njira zomwe zimafalitsira, momwe amagwirira ntchito ndi omwe amawalandira, komanso njira zowongolera zogwira mtima komanso zokhazikika. Munthawi ya ulimi wovuta, kusintha kwa nyengo, komanso kuyenda kwa zinthu zobzala m'madera osiyanasiyana, matenda a mavairasi m'zomera amakhala pachiwopsezo chachikulu chifukwa nthawi zambiri amayambitsa kutayika kwakukulu, ndi ovuta kuchiza akagwidwa ndi kachilomboka, ndipo zizindikiro zawo nthawi zambiri zimafanana ndi kusowa kwa michere kapena kupsinjika kwa chilengedwe. Kupita patsogolo kwa sayansi ya zamoyo, majini, ndi ukadaulo wofulumira wozindikira matenda kwasintha sayansi ya zomera kuchoka pakungozindikira zizindikiro kupita kumvetsetsa njira zochizira matenda ndikupanga njira zolondola zowongolera matenda.
Mavairasi a zomera ndi kusiyanasiyana kwawo
Mavairasi a zomera nthawi zambiri amakhala tinthu tating'onoting'ono tomwe timanyamula zinthu za majini monga RNA kapena DNA, tozunguliridwa ndi puloteni capsid, ndipo m'mitundu ina, ndi zina zowonjezera. Mosiyana ndi bowa kapena mabakiteriya, mavairasi sangabereke popanda selo lokhalamo. Akalowa m'thupi la zomera, kachilomboka "kamagwiritsa ntchito" makina a maselo kuti abwereze majini ake ndikupanga tinthu tatsopano ta mavairasi. Chinthu china chapadera cha mavairasi a zomera ndi kuthekera kwawo kusuntha pakati pa maselo kudzera mu plasmodesmata—njira zazing'ono zolumikizira maselo—ndi kufalikira kudzera mu phloem. Chifukwa chake, gawo limodzi la matenda pa tsamba limatha kukhala matenda a chomera nthawi yochepa.
Mavairasi a zomera ndi gulu losiyanasiyana kwambiri. Ambiri ali ndi majini a RNA omwe ali ndi chingwe chimodzi, monga ma Potyvirus (monga mavairasi a mosaic a zomera zosiyanasiyana) kapena ma Tobamovirus (chitsanzo chodziwika bwino ndi Tobacco mosaic virus/TMV). Palinso mavairasi a DNA, monga Geminivirus, omwe nthawi zambiri amayambitsa kupindika kwa masamba ndipo ndi vuto lalikulu mu tomato, tsabola, ndi thonje m'madera otentha. Kusintha kumeneku kumakhudza njira zofalitsira, kukhazikika kwa mavairasi m'chilengedwe, ndi njira zowongolera.
Zizindikiro ndi momwe zimakhudzira kupanga
Zizindikiro za matenda a kachilombo ka zomera zitha kukhala mosaic (madontho obiriwira pang'ono), chlorosis, madontho, kupindika kwa masamba, kufooka, necrosis, madontho a mphete, komanso kusintha kwa zipatso. Nthawi zina, matenda a kachilombo samayambitsa zizindikiro zoonekeratu (zobisika) koma amachepetsabe zokolola kapena ubwino. Zotsatira zake zingakhale zazikulu: kuchepa kwa kulemera kwa zipatso, kukula kwa tuber, ulusi wabwino, komanso kuchepa kwa nthawi yokolola. Mu mbewu za m'munda monga tsabola, tomato, nkhaka, nthochi, kapena orchid, kutayika kwachuma sikungochitika chifukwa cha kuchuluka kwa zokolola komanso chifukwa cha kukanidwa kwa msika chifukwa cha mawonekedwe oipa.
Vuto lalikulu la matenda opatsirana ndi kusowa kwa "mankhwala" ochiritsa omwe angaphe kachilomboka mkati mwa chomera popanda kuvulaza chomeracho. Chifukwa chake, cholinga chachikulu choyang'anira ndi kupewa, kuzindikira msanga, ndikuletsa unyolo wofalitsa matendawa.
Njira yofalitsira: ma vectors, mbewu, ndi zipangizo zobzala
Katswiri wa zomera zamakono amaika patsogolo kwambiri pa matenda a mliri: momwe mavairasi amafalikira m'munda. Kufalikira kumachitika nthawi zambiri kudzera m'mabakiteriya a tizilombo, makamaka nsabwe za m'masamba, ntchentche zoyera (Bemisia tabaci), thrips, ziwombankhanga, ndi tizilombo tina. Chotengera chilichonse chimakhala ndi njira yosiyana yofalitsira. Mwachitsanzo, mavairasi ena amafalikira mosalekeza: tizilombo timangofunika "kulawa" kwakanthawi kochepa kwa minofu kuti titenge ndikufalitsa kachilomboka. Izi zimapangitsa kuti mankhwala ophera tizilombo asagwire ntchito, chifukwa kachilomboka kamafalikira kale kachilomboka kasanafe. Mosiyana ndi zimenezi, mavairasi omwe amafalikira mosalekeza amafunika nthawi yayitali yopezera kachilomboka ndipo amatha kukhalabe m'thupi la chotengera, zomwe zimapangitsa kuti kasamalidwe ka tizilombo toyambitsa matenda kakhale kofunikira kwambiri.
Mavairasi amathanso kunyamulidwa ndi mbewu kapena zinthu zobzalira zomera monga kudula, kulumikiza, tubers, rhizomes, ndi zomera zosayeretsedwa. Mu mbewu monga mbatata, nthochi, nzimbe, ndi zomera zosiyanasiyana zokongoletsera, kuyenda kwa zinthu zobzalira zomwe zili ndi kachilombo ndiyo njira yayikulu yofalitsira pakati pa madera. Kuphatikiza apo, mavairasi ena ndi okhazikika kwambiri ndipo amatha kufalikira kudzera mu zida zaulimi, kukhudzana ndi makina, kapena zinyalala za zomera.
Matenda amakono: kuyambira zizindikiro mpaka majini
Kale, kuzindikira kachilombo nthawi zambiri kunkadalira zizindikiro, zomera zosonyeza, kapena maikulosikopu ya ma elekitironi. Masiku ano, sayansi ya zomera ikupita patsogolo mofulumira kudzera mu kufufuza kwa mamolekyulu. Njira ya ELISA (Enzyme-Linked Immunosorbent Assay) ikadali kugwiritsidwa ntchito kwambiri chifukwa cha mtengo wake wotsika komanso woyenera kuunika. Komabe, kulondola kwakukulu ndi kukhudzidwa kumapezedwa kudzera mu PCR/RT-PCR, qPCR, ndi LAMP (Loop-mediated Isothermal Amplification), zomwe zimatha kuchitika mwachangu ndipo nthawi zina zimakhala zoyenera kugwiritsidwa ntchito m'munda.
Kusintha kwakukulu kumachokera ku ukadaulo wa next-generation sequencing (NGS). Ndi NGS, ofufuza amatha kuzindikira mavairasi popanda kudziwa cholinga chawo choyamba. Izi ndizofunikira kwambiri popeza mavairasi atsopano, kuzindikira matenda osiyanasiyana, ndikulemba mitundu yosiyanasiyana ya majini okhudzana ndi kufalikira kwa kachilomboka komanso kupewa kukana. Deta ya majini imathandizanso kufalikira kwa mamolekyulu, zomwe zimathandiza kuti pakhale mfundo zokhazikika zokhazikika komanso zotsimikizira mbewu.
Kuyanjana kwa mavairasi ndi zomera: chitetezo cha mavairasi ndi njira zodzitetezera
Zomera sizingokhala zokha. Zili ndi chitetezo chomangidwa mkati, kuphatikizapo kuletsa RNA—njira yomwe imazindikira RNA yachilendo ndikuiwononga. Mavairasi ambiri a zomera apanga mapuloteni oletsa kuletsa chitetezochi. Mpikisano wosinthika pakati pa mavairasi ndi zomera umapanga mphamvu ya matenda m'munda: mitundu yolimbana ndi matendawa imatha kukhala yoopsa ngati kachilomboka kasanduka mitundu yatsopano.
Kumvetsetsa kuyanjana kwa mamolekyulu kumeneku ndikofunikira kwambiri pa sayansi yamakono ya ma virus, chifukwa kumatsegula njira yopangira njira yolimbana ndi kukana: kudzera mu njira zachikhalidwe zosankhidwa ndi zizindikiro komanso njira za biotechnology.
Njira zowongolera zophatikizika mu nthawi yamakono
Popeza matenda opatsirana ndi mavairasi ndi ovuta kuchiza, njira zamakono zimagogomezera kwambiri njira yothanirana ndi tizilombo toyambitsa matenda yomwe imagwirizana ndi mavairasi. Zigawo zake zazikulu ndi izi:
1. Zipangizo zobzala zabwino komanso zovomerezeka
Kugwiritsa ntchito mbewu zopanda mavairasi kapena mbande zokulitsa minofu zomwe zayesedwa pogwiritsa ntchito njira zodziwira matenda. Chitsimikizo ndi chofunikira kwambiri pazinthu zobzalidwa ndi zomera.
2. Ukhondo ndi kuthetseratu
Zulani ndi kuwononga zomera zomwe zikuwonetsa zizindikiro msanga (kuchotsa udzu womwe uli m'gulu la zomera), chotsani udzu womwe uli m'gulu la zomera, ndikuyeretsa zida kuti zisafalikire ndi makina.
3. Kusamalira tizilombo pogwiritsa ntchito zachilengedwe
Kugwiritsa ntchito mulch wowunikira kuti asokoneze momwe nsabwe/ntchembere zimayendera, kuyika misampha yachikasu, mtunda pakati pa zomera, kubzala zotchinga, ndi kutulutsa adani achilengedwe. Mankhwala ophera tizilombo amaikidwa mosankha komanso panthawi yake kuti apewe kukana ndikusunga adani achilengedwe.
4. Mitundu yosagonja komanso yobereketsa molondola
Mitundu yokhala ndi majini enieni okana kapena kukana kuchuluka kwa mitundu ingachepetse chiopsezo cha miliri. Kubereketsa pogwiritsa ntchito majini kumathandiza kusankha mwachangu.
5. Nthawi yobzala ndi kusamalira malo
Kubzala nthawi yomwe matenda sapezeka kwambiri, kusinthana kwa mbewu, komanso kusamalira mbewu mosakaniza ndi mosaic m'derali kungasokoneze kayendedwe ka matenda.
Ukadaulo watsopano: CRISPR, RNAi, ndi kuzindikira malo
Ma virology amakono a zomera akuphatikizaponso zatsopano monga kusokoneza kwa RNA (RNAi) kuti aletse kufalikira kwa mavairasi kudzera mu kufotokozera kwa RNA yolunjika. Pakadali pano, CRISPR imatsegula njira ziwiri: (1) kusintha majini a zomera ofunikira kuti kachilombo kaberekedwe kuti zomera zisawonongeke, ndipo (2) m'mavairasi ena a DNA, dongosolo la CRISPR likhoza kutsogozedwa kuti lidule majini a kachilombo. Ngakhale kuti njirazi zimalonjeza, zimafuna kuwunika chitetezo cha chilengedwe, kukhazikika kwa nthawi yayitali, komanso kuvomereza malamulo.
Kumbali yowunikira matenda, zipangizo zonyamulika zochokera ku LAMP, ma biosensor, komanso ma miniaturized sequencers (monga nanopores) akuyamba kulola kuti zidziwike mwachangu m'munda. Izi ndizofunikira kwambiri kuti zithetsedwe msanga mliri usanafalikire, makamaka m'malo opangira zomera omwe ali ndi mbewu zambiri zomwe zimakula mwachangu.
Mavuto amtsogolo
Mavuto ena akuluakulu omwe akukumana ndi kachilombo ka zomera mtsogolo ndi kufalikira kwa mavairasi chifukwa cha malonda apadziko lonse lapansi, kubuka kwa mitundu yatsopano kudzera mu kusintha kwa majini ndi kubwereranso kwa majini, komanso kusintha kwa nyengo, komwe kumakulitsa mitundu yosiyanasiyana ya mavairasi. Kuphatikiza apo, matenda osiyanasiyana okhudzana ndi mavairasi angapo amatha kukulitsa zizindikiro ndikupangitsa kuti matenda azivuta. Mavuto azachuma ndi azachuma nawonso ndi ofunikira: alimi amafunikira mayankho omwe ndi enieni, otsika mtengo, komanso ogwirizana ndi zochitika zakomweko.
Kutseka
Kuphunzira za ma virus a zomera masiku ano sikuti kumangokhudza "ma virus omwe amaukira zomera," komanso kumvetsetsa njira zopezera matenda, kupanga mapu a kayendedwe ka ma virus pamlingo wa majini, ndikupanga njira zolima zomwe zimaletsa kufalikira kwa matenda. Kuphatikiza njira zodziwira matenda mwachangu, kuswana kosagonjetseka, kuyang'anira mwanzeru ma ventricles, ndi mfundo zodzipatula komanso kutsimikizira zida zobzala ndi maziko ofunikira. Ndi njira zolondola kwambiri zasayansi komanso mgwirizano wamphamvu pakati pa ofufuza, ogwira ntchito zowonjezera, makampani opanga mbewu, ndi alimi, kutayika kwa matenda a ma virus kungachepe, ndikuwonetsetsa kuti chakudya chili bwino komanso ulimi ukhale wokhazikika mtsogolo.
