I-Bacteriology Yezitshalo Zezolimo
I-bacteriology yezitshalo zezolimo igatsha lesayensi elifunda amabhaktheriya ahlobene nezitshalo ezitshaliwe, kokubili njengezinto ezibangela izifo kanye namagciwane awusizo asekela ukukhula nokukhiqiza. Ezinhlelweni zezolimo zanamuhla, ukuqonda amabhaktheriya ezitshalo kubaluleke kakhulu ngoba kungasiza abalimi kanye nabasebenzi bezolimo ukuphatha impilo yezitshalo ngokunembe kakhudlwana, ukunciphisa ukuthembela kumakhemikhali, nokwandisa isivuno sezitshalo ngendlela eqhubekayo. Amabhaktheriya akhona cishe kuzo zonke izingxenye zesistimu yezolimo—enhlabathini, emanzini okunisela, ezindaweni zamaqabunga, ezicutshini zezitshalo, ngisho nasendaweni yezimpande—futhi asebenzisana ngokuguquguqukayo nezitshalo nezinye izinto ezincane.
Indima yamagciwane ezindaweni zemvelo zezolimo
Emasimini ezolimo, amabhaktheriya asebenza njengabaqhubi ababalulekile bokujikeleza kwezakhamzimba. Asiza ekuboleni kwezinto eziphilayo, ekuboleni izinsalela zezitshalo, nasekuguquleni izinto ezifana ne-nitrogen, i-phosphorus, ne-sulfur zibe izinhlobo izitshalo ezingazimunca. Ngakolunye uhlangothi, amanye amabhaktheriya angaba amagciwane, ahlasele izicubu zezitshalo, abangele izimpawu zesifo, anciphise ikhwalithi yesivuno, futhi abangele ngisho nokwehluleka kwezitshalo. Ngakho-ke, i-bacteriology yezitshalo zezolimo ayigxili nje kuphela ekuboneni amabhaktheriya kodwa futhi nasekuqondeni ubudlelwano phakathi kwamabhaktheriya nezitshalo nendawo kanye namasu okuwalawula.
Amabhaktheriya abangela izifo ezitshalweni: izici nezibonelo
Amabhaktheriya abangela izifo angamabhaktheriya akwazi ukuthelela izitshalo futhi abangele izifo. Ukutheleleka kuvame ukwenzeka ngamanxeba omshini, ama-stomata, ama-hydathode, noma izikhala zemvelo esitshalweni. Izimo zemvelo ezifana nomswakama ophezulu, imvula, izikhukhula, kanye namazinga okushisa athile zivame ukusheshisa ukusabalala kwezifo zamagciwane.
Amanye amaqembu avamile amabhaktheriya ezitshalo abangela izifo afaka:
1. I-Xanthomonas spp.
Leli qembu laziwa ngokubangela amabala amaqabunga, ukubola, kanye nokubola kwemikhiqizo eyahlukahlukene njengelayisi, upelepele, utamatisi, kanye ne-citrus. Isibonelo yi-Xanthomonas oryzae, ebangela ukubola kwamaqabunga ebhaktheriya elayisini, isifo esibalulekile esinganciphisa kakhulu umkhiqizo.
2. I-Pseudomonas syringae
Leli gciwane livame ukubangela amabala amaqabunga kanye nokubola kwesiqu ezitshalweni zezitshalo nezezithelo. Liphila ezindaweni zamaqabunga futhi likhula kahle ezimweni ezinomswakama.
3. I-Ralstonia solanacearum
Isifo sokubuna kwamagciwane sibangela ukuthi izitshalo ezifana notamatisi, upelepele, amazambane, kanye nama-eggplant zikhule enhlabathini. Leli gciwane lihlala enhlabathini futhi lihlasele izimpande, bese livimba imithambo ye-xylem, okubangela ukuthi isitshalo sibune ngisho noma inhlabathi inomswakama owanele.
4. I-Erwinia/Pectobacterium spp.
Kwaziwa ngokubangela ukubola okuthambile emifinweni nasezigabheni ezifana namazambane, izaqathi, kanye neklabishi. Amabhaktheriya akhiqiza i-enzyme i-pectinase, encibilikisa izindonga zamaseli, okwenza izicubu zibe thambile futhi zibe namanzi.
Izimpawu zezifo zamagciwane ezitshalweni zingafaka phakathi amabala amaqabunga acwiliswe emanzini, amaqabunga aphuzi, ukubola kwesiqu, ukubola okunuka kabi, kanye nokubuna ngokuzumayo. Ukuxilongwa okufanele kubalulekile ngoba izimpawu zamagciwane zivame ukulingisa ezezifo zesikhunta noma izifo zomzimba.
Amabhaktheriya awusizo: izihlobo zezitshalo
Akuwona wonke amabhaktheriya ayingozi. Amabhaktheriya amaningi empeleni asebenza “njengamagciwane awusizo” asekela ukukhula kwezitshalo, andise ukutholakala kwezakhamzimba, futhi avikele izitshalo emagciwaneni. Lawa mabhaktheriya awusizo avame ukutholakala endaweni ezungezile izimpande, ama-endophyte (ngaphakathi kwezicubu zezitshalo), noma ebusweni bamaqabunga.
Ezinye zezindima zama-bacteria anenzuzo zifaka:
1. Ukulungiswa kwe-nitrogen
Amabhaktheriya afana ne-Rhizobium akha ubudlelwano bokusebenzisana nezitshalo ze-legume (ubhontshisi, amantongomane, kanye nobhontshisi we-mung) ukuze akhe amaqhubu ezimpande. Kula maqhubu, i-nitrogen esemoyeni iguqulwa ibe yi-ammonia, ewusizo esitshalweni. Ngaphezu kwalokho, amabhaktheriya aphilayo mahhala njenge-Azotobacter kanye ne-Azospirillum nawo angalungisa i-nitrogen ngaphandle kokwakha amaqhubu.
2. Izithako ze-phosphate (amabhaktheriya ancibilikisa i-phosphate, i-PSB)
I-phosphorus ivame ukubopha ngendlela okunzima ukuthi izitshalo ziyimunce. Amabhaktheriya ancibilikisa i-phosphate njenge-Bacillus ne-Pseudomonas angakhiqiza ama-asidi noma ama-enzyme ancibilikisa i-phosphate, okwandisa ukutholakala kwayo.
3. Ukukhiqizwa kwe-hormone yokukhula
Amanye amabhaktheriya akhiqiza ama-phytohormone afana ne-auxins (IAA), i-gibberellins, kanye ne-cytokinins angakhuthaza ukukhula kwezimpande futhi andise ukumuncwa kwezakhamzimba.
4. Ukulawulwa kwezinto eziphilayo ngokumelene namagciwane
Amabhaktheriya aphikisanayo angacindezela amagciwane ngokuncintisana ngesikhala nezakhamzimba, ukukhiqizwa kwama-antibiotic, ukukhiqizwa kwe-siderophore (ukubopha insimbi), noma ukuqaliswa kokumelana nesistimu ezitshalweni. Izibonelo ezivamile zifaka phakathi i-Bacillus subtilis ne-Pseudomonas fluorescens.
Ukusebenzisana kwamagciwane nezitshalo kanye nendawo ezungezile
Ukusebenzisana kwamagciwane nezitshalo kuthonywa kakhulu yizimo zemvelo kanye nemikhuba yokulima. Izici ezifana ne-pH yenhlabathi, okuqukethwe kwezinto eziphilayo, umswakama, izinga lokushisa, izinhlelo zokunisela, kanye nokusetshenziswa komanyolo kanye nezibulala-zinambuzane kungathinta ukwakheka kwemiphakathi yamagciwane. Isibonelo, ukusetshenziswa ngokweqile komanyolo we-nitrogen kunganciphisa ukuthembela kwesitshalo kumagciwane alungisa i-nitrogen, kuyilapho ukusetshenziswa kwezibulala-zinambuzane ezithile kungacindezela amagciwane awusizo.
Ngakolunye uhlangothi, ukuguquka kwesimo sezulu nakho kunemiphumela ebalulekile. Ukwenyuka kwamazinga okushisa kanye namaphethini emvula angaguquki kungandisa ukusabalala kwezifo ezithile futhi kwandise amathuba okuqubuka kwezifo zamagciwane. Ngakho-ke, ukuphathwa okusekelwe emvelweni okucabangela inhlabathi kanye nama-microbiomes ezitshalo kuyisu elibalulekile kwezolimo zesikhathi esizayo.
Izindlela zokuhlonza nokuhlola amagciwane ezitshalo
Kuma-bacteria ezitshalo zezolimo, ukuxilongwa okunembile kubalulekile ekulawuleni okuphumelelayo. Izindlela zokuhlonza zingaba ezendabuko kanye nezesimanje:
– Ukuhlukaniswa kanye nokukhuliswa kwamagciwane kwimidiya ye-agar ukuze kubonwe ukuma kwekoloni, umbala, kanye nesivinini sokukhula.
– Ukuhlolwa kwe-biochemical, njengokuhlolwa kwe-Gram, i-oxidase, i-catalase, noma ukubiliswa koshukela ukuze kuhlukaniswe amaqembu amabhaktheriya.
– Ukuhlolwa kwe-Pathogenicity (i-Koch's postulates) ukuqinisekisa ukuthi amagciwane abangela izifo ngempela.
- Amasu e-molecular njenge-PCR, ukulandelana kwe-DNA, kanye nokuhlonza okusekelwe ku-16S rRNA gene ukuze kutholakale ukunemba okuphezulu.
– I-Serology (ELISA) ukuze kutholakale ngokushesha elabhorethri.
Intuthuko kwezobuchwepheshe bama-molecule ivumela ukutholakala okusheshayo nokunembile, ngisho nangaphambi kokuba kuvele izimpawu, okuvumela ukulawulwa kusenesikhathi.
Amasu okulawula izifo zamagciwane ezitshalweni
Ukulawulwa kwezifo zamagciwane kudinga indlela ehlanganisiwe ngoba amabhaktheriya avame ukuba nzima ukuwalawula ngemithi yokubulala isikhunta evamile. Amanye amasu asetshenziswa kakhulu afaka:
1. Imbewu enempilo nehlanzekile
Amagciwane amaningi athwalwa yimbewu noma izinsalela zezitshalo. Ukusebenzisa imbewu eqinisekisiwe kanye nokuhlanza imishini yezolimo kunganciphisa imithombo yokugonywa.
2. Ukujikeleza kwezitshalo
Ukujikeleza ngezitshalo ezingezona ezithwala izitshalo kusiza ukunciphisa inani lamagciwane abangela izifo enhlabathini, ikakhulukazi ezifweni ezithwala izifo ezithwalwa yinhlabathi njengeRalstonia.
3. Ukuphathwa kwamanzi kanye nokugeleza kwamanzi
Amanzi amile kanye namachaphaza asheshisa ukusabalala. Izinhlelo zokunisela ngamaconsi kanye nokukhipha amanzi kahle kungavimbela ukukhula kwezifo.
4. Izinhlobo ezimelana nezifo
Ukusetshenziswa kwezinhlobo ezimelana nezakhi zofuzo ezifweni ezithile kuyisinyathelo esiphumelelayo nesingadingi mali.
5. Izinto eziphilayo kanye nezichumisi eziphilayo
Ukusetshenziswa kwamagciwane aphikisayo njengemithi yokubulala izinambuzane kanye nemijovo yamagciwane ukuthuthukisa impilo yenhlabathi kuyindlela enobungani nemvelo.
6. Ama-bacterial asekelwe kuthusi noma ama-antibiotic athile
Ukusetshenziswa kwamakhemikhali kudinga ukuqapha ngenxa yengozi yokumelana nemithi kanye nemiphumela emvelweni. Ama-antibiotic ezolimo nawo ayancishiswa emazweni amaningi.
Amathemba e-bacteriology kwezolimo eziqhubekayo
Esikhathini esizayo, i-bacteriology yezitshalo zezolimo izohlanganiswa kakhulu nemibono ye-microbiome kanye nezolimo ezinembile. Ucwaningo ngemiphakathi yamagciwane enhlabathini lungasiza ekwakheni "ubunjiniyela be-microbiome" ngokungeza inhlanganisela yamagciwane anenzuzo, ukucindezela amagciwane, kanye nokwandisa ukusebenza kahle komanyolo. Izinto ezintsha ezifana ne-biofertilizer, i-biostimulants esekelwe kumagciwane, kanye nobuchwepheshe bokuthola izifo ngokushesha kuzosekela ukukhiqizwa kokudla okuzinzile phakathi kwezinselele zokushintsha kwesimo sezulu kanye nokuwohloka komhlaba.
Ekugcineni, isayensi yamagciwane ezitshalo zezolimo ifundisa ukuthi impilo yezitshalo ayinqunywa nje kuphela ngokuhlukahluka nomanyolo, kodwa futhi nangokulingana kwamagciwane ayizungezile. Ngokuqonda okufanele, amabhaktheriya angaba yizitha okufanele zilawulwe futhi abe ngabangane okufanele banakekelwe. Ukuphatha amabhaktheriya ngokuhlakanipha kusho ukuphatha isisekelo sempilo yomhlabathi kanye nokukhiqiza kwezolimo okusimeme.
