Zvirwere zveMichero Midiki zveZvirimwa
Zvidzidzo zve microbiology yezvirwere zvezvirimwa ibazi resainzi rinoongorora tupukanana tunokonzera zvirwere mumiti, kuti tunotapurirana sei, tunoberekana sei, uye tunodyidzana sei nemiti nenzvimbo. Mukurima, zvirwere zvemiti chinhu chinotadzisa kugadzirwa, zvichideredza kunaka uye huwandu hwegoho. Nokudaro, kunzwisisa microbiology yezvirwere zvemiti kwakakosha pakugadzira nzira dzinoshanda uye dzinogara kwenguva refu dzekudzivirira, kuongorora, uye kudzora.
Pfungwa Huru dzeZvirwere zveMiti
Zvirwere zvezvirimwa zvinoitika kana paine kusagadzikana kwemuviri kunoramba kuripo kunokonzera zviratidzo zvakasiyana-siyana, zvakaita sekusvava, mavara emashizha, kuora kwemidzi, kana kukura zvishoma nezvishoma. Kazhinji, zvirwere zvinotapukira zvinokonzerwa nezvirwere, zvipenyu zvinogona kukonzera chirwere. Zvirwere zvezvirimwa zvinogona kusanganisira fungus, mabhakitiriya, mavhairasi, mavairasi, maphytoplasmas, nematodes, uye kunyange zvipenyu zvakaita sefungus zvakaita seoomycetes. Panguva imwecheteyo, zvirwere zvisingatapukiri zvinokonzerwa nezvinhu zvisingararami, zvakaita sekushomeka kwezvinovaka muviri, chepfu yezvipembenene, munyu wakawanda, kana kusanaya kwemvura.
Mukudzidza nezve microbiology, chinonyanya kutariswa ndechekutarisa hutachiona husingaonekwe—mararamiro ahwo, kupararira kwahwo, mashandiro ehutachiona, uye maitiro ekudzivirira emiti.
Mapoka Makuru Anokonzera Zvirwere muZvirwere zveMiti
1. Howa (Fungi)
Mafungus ndiwo anonyanya kukonzera zvirwere zvezvirimwa. Anoberekana kuburikidza nemaspores anoparadzirwa zviri nyore nemhepo, mvura inonaya, kana zvishandiso zvekurima. Mafungus anogona kurwisa mashizha, madzinde, midzi, michero, uye kunyange mbeu. Mienzaniso yezvirwere zvefungus zvinowanzo sanganisira powdery mildew, ngura, uye anthracnose.
Howa hunokonzera hutachiona hunowanzo pararira mumiti kuburikidza nemaronda kana stomata. Kana hwapinda mukati, howa hunogadzira hyphae inopararira munyama yemiti yose yotora zvinovaka muviri. Humwe howa hunoda nyama mhenyu, nepo humwe hune necrotrophic (hunouraya nyama kutanga wozodya). Kusiyana uku mumaitiro kunokanganisa zviratidzo zvechirwere uye nzira dzekudzora.
2. Mabhakitiriya
Mabhakitiriya anokonzera zvirwere mumiti anowanzo kukonzera zviratidzo zvakaita semavanga akanyorova mumvura, kuora kwakapfava, mavanga, uye mavanga emuti. Mienzaniso yakakosha inosanganisira Xanthomonas, Pseudomonas, naErwinia (zvino zvave kupatsanurwa zvakanyanya kune mamwe marudzi, asi zvichiri kuzivikanwa zvakanyanya mumabhuku ezvekurima).
Mabhakitiriya anopinda nemaronda, stomata, kana hydathodes uye anowanda munzvimbo dziri pakati pemasero. Mabhakitiriya mazhinji anogadzira ma enzymes e pectinase ne cellulase anoputsa madziro emasero emiti, zvichiita kuti nyama inyorove uye iore. Kupararira kwebhakitiriya kunowanzo batsirwa nemvura inonaya, kudiridza, zvipembenene, uye midziyo yekurima yakasvibiswa.
3. Mavhairasi nemaViroid
Mavhairasi emiti ihutachiona husingaonekwe zvakanyanya hunogona kungoberekana mumasero mapenyu chete. Mavhairasi anowanzo kukonzera zviratidzo zvemosaic (green-yellow mottling), kupeta mashizha, kusakwanisa kubereka zvakanaka, uye kudzikira kwegoho zvakanyanya. Mavhairasi anowanzo paradzirwa kuburikidza nezvipembenene zvakaita seaphids, leafhoppers, thrips, kana mites. Mavhairasi anogonawo kutapurirwa kuburikidza nekupararira kwezvirimwa (kucheka, tuber), mbeu, uye maturusi ekudyara.
Mavhairasi akafanana nemavhairasi asi ari nyore—anoumbwa nemaRNA madiki chete asina protein coat. Pasinei nekureruka kwawo, mavhairasi anogona kukonzera zvirwere zvakakomba, zvakaita semumbatatisi nematomatisi.
4. Phytoplasma
Phytoplasmas mabhakitiriya chaiwo asina madziro emasero anogara mutsinga dzemiti. Zviratidzo zvinowanzo sanganisira kutsvuka, kukura zvishoma, matavi akawanda (mutsvairo wevaroyi), uye kuumbwa kwemaruva kusina kujairika. Phytoplasmas dzinotapuriranwa nezvipembenene zvinoyamwa phloem zvakaita sehove dzemiti nehove dzemashizha. Nekuti zvakaoma kuikura murabhoritari, kuongororwa kwe phytoplasmas kunowanzoenderana nemaitiro emamorekuru.
5. Oomycetes (Zvipenyu zvakafanana nefungus)
Maoomycetes akadai sePhytophthora nePythium anowanzo fungidzirwa sefungus, asi ane hukama hwakanyanya nealgae. Anozivikanwa nekukonzera kuora kwemidzi, damping-off, uye leaf blight. Maoomycetes anogadzira spores dzekushambira (zoospores), zvichiita kuti dzitapurirane zvakanyanya mumamiriro emvura uye asina kusimba. Mbatatisi late blight inokonzerwa nePhytophthora infestans muenzaniso unozivikanwa, wakakonzera nzara huru yeIreland muzana remakore rechi19.
Maitiro eKutapukirwa uye Kukura kweZvirwere
Kuvapo kwezvirwere zvezvirimwa kunogona kutsanangurwa uchishandisa pfungwa ye "disease triangle," ine zvinhu zvitatu: host (chirimwa chinogona kubatwa), utachiona hune hutachiona, uye nharaunda inotsigira. Kana chimwe chezvinhu izvi chisipo, chirwere hachizokura kusvika pakukwanisa kwacho kwakazara.
Matanho ehutachiona anowanzo sanganisira:
1. Kubaya: utachiona hunosvika pamusoro pemuti.
2. Kupinda: utachiona hunopinda nepadumbu, maronda, kana kupinda zvakananga muganda.
3. Utachiona: utachiona hunodzika uye hunotanga kukura munyama.
4. Kupararira kwehutachiona: kupararira kwakakura kwehutachiona, zvichikonzera zviratidzo.
5. Kuberekana uye kupararira: utachiona hunogadzira maumbirwo ekubereka (spores, masero emabhakitiriya, zvidimbu zvemavhairasi) kuti zvitapukire kune zvimwe zvirimwa.
Padanho rezvinhu zvipenyu zvidiki, utachiona hunoshandisa "zvombo" zvakasiyana-siyana, zvakaita sema enzymes anoparadza madziro emasero, chepfu, uye mapuroteni anobatsira anoderedza dziviriro yemiti. Zvirimwa pachazvo zvine masisitimu ekudzivirira emukati, akadai sekusimbisa madziro emasero, kugadzirwa kwemakemikari anorwisa utachiona (phytolaxins), uye mhinduro inouraya masero ari pedyo nenzvimbo yehutachiona kudzivirira kupararira kwehutachiona.
Kuongororwa kwezvirwere zvezvirimwa ne microbiological
Kuziva zvirwere zvemiti kunoda zvinopfuura kungotarisa zviratidzo chete, sezvo zviratidzo zvakafanana zvinogona kukonzerwa nezvirwere zvakasiyana kana zvinhu zvisingakuvadzi muviri. Microbiology inopa nzira dzekuziva chinokonzera chirwere, dzinosanganisira:
- Kuparadzanisa uye kukudziridza hutachiona (kazhinji fungus nemabhakitiriya) pane zvimwe zvinhu.
– Kutarisa nepa microscopic kuti uone spores, hyphae, kana maumbirwo akajairika.
– Kuongororwa kwezvirwere (Koch's Postulates): utachiona hunobviswa, hwoiswazve mumiti ine hutano, uye hwozoonekwa kuti hunoratidza zviratidzo zvakafanana.
- Nzira dzeSerological dzakadai seELISA, kunyanya dzemavhairasi.
- Nzira dzemamorekuru dzakadai sePCR neDNA/RNA sequencing kuti zvionekwe nekukurumidza uye zvakananga, kusanganisira phytoplasmas uye hutachiona hwakaoma kukura.
Kana kuongororwa kwakakodzera, matanho ekudzora anowedzera kuva akarurama, zvichiita kuti kushandiswa kwemishonga inouraya zvipembenene kuderedzwa.
Maitiro Ekudzivirira Akavakirwa paMicrobiology
Kudzora zvirwere zvezvirimwa zvakanaka kushandisa nzira yakabatana yekudzivirira zvirwere. Dzimwe nzira dzakakosha dzinosanganisira:
1. Kushandisa mhando dzinorwisa utachiona: kushandisa majini anorwisa hutachiona hwezvirwere zvinotapukira.
2. Kutarisira nharaunda: dzora daro rekudyara, kuyerera kwemvura, kufamba kwemhepo, uye nguva yekudiridza kuderedza hunyoro hunodiwa nezvirwere.
3. Kuchenesa nekuisa vanhu muchivande: bvisai zvikamu zvemiti zvine chirwere, chenesai maturusi, uye dzivirirai kupinda kwezvirimwa zvine chirwere.
4. Kudzora hutachiona: kushandisa utachiona hunorwisa hutachiona hwakadai seTrichoderma (inorwisa fungus dzinokonzera hutachiona), Bacillus (inodzivirira mabhakitiriya/fungus), kana mycorrhiza iyo inovandudza hutano hwemidzi.
5. Kushandisa mishonga yezvipembenene nekuchenjera: mishonga yekuuraya zvipembenene nemabhakitiriya inogona kushanda, asi inofanira kunge iri muchiyero chakakodzera, zvichienderana nechinangwa, uye ichifunga nezvenjodzi yekusagona kudzivirira utachiona uye kukanganisa nharaunda.
6. Kudzora zvipembenene: kwakakosha pazvirwere zvemavhairasi ne phytoplasma zvinoenderana nezvipembenene.
Nzira dzemazuva ano dzekuongorora tupukanana tudiki dzinogadzirawo matekinoroji akadai semishonga inouraya tupukanana tunobva kutupukanana, kutanga kwekusagona kudzivirira zvirimwa, uye kugadzira magenome etupukanana kuti tifanotaura kushanduka kwehutachiona.
Penutup
Kudzidziswa kwezvirwere zvezvirimwa (plant disease microbiology) kunoita kuti pave nekunzwisisa kwakadzama kwezvirwere zvinotapukira, nzira dzehutachiona, uye kusangana kwakaoma pakati pezvirimwa, tupukanana, nenzvimbo. Sainzi iyi inheyo yakakosha yekurima kwemazuva ano, ichivimbisa kuchengetedzwa kwechikafu, ichideredza kurasikirwa kwezvirimwa, uye ichikurudzira nzira dzekurima dzisina njodzi kune nharaunda. Nekuongorora kwakarurama uye kudzora kwakabatana kwakavakirwa pasainzi, zvirwere zvezvirimwa zvinogona kutarisirwa zviri nani, nenzira inochengetedza nharaunda, uye nekushandisa mari yakawanda.
