Kwicandelo le-biology yeseli kunye ne-botany kukho intetho eninzi malunga Ibhanti yecaspary nokubaluleka kwayo. Kukuqina kweendonga zeseli ezidlala indima ebalulekileyo kwizicubu zenkxaso yezityalo ze-vascular nakwezinye i-algae. Siyazi ukuba udonga lweseli lwenziwe nge-lignin kunye ne-suberin kwaye iyanceda ukukhusela isityalo. Ibhendi yeCaspary yenziwa ngaxeshanye kunye neendonga zeseli eziphambili kwingcambu yokuqala kwaye ukusuka apho kubaluleke kakhulu kuphuhliso lwesityalo.
Kweli nqaku siza kukuxelela yonke into ekufuneka uyazi ngokusekwa nokubaluleka kwebhendi yeCaspary.
Iimpawu eziphambili
Siyazi ukuba i-endodermis yeendonga zeseli inobungqingqwa, ubulukhuni, ukunganyangeki okungagungqiyo okunceda ukukhusela iiseli zezityalo. Ukuqina kweendonga zeseli ezinqamlezayo kunye ezinqamlezileyo kubangelwa ziipolymer zendalo ezaziwa njengebhanti yeCaspary. Idlala indima ebalulekileyo kwizicubu zokuxhasa izityalo ezinemithambo kunye nolwelwe oluthile. Kukho ibhendi kwiseli nganye efakwe zizinto eziphilayo okanye iipolymers kwaye iphawula umahluko omkhulu phakathi kweendonga zokuqala zeeseli.
Ibhendi yeCaspary inabela kuzo zonke iindonga ngendlela engapheliyo. Oko kukuthi, ayibonakali ngaxeshanye kuzo zonke iiseli ze-endodermis. Igama layo livela kwimveliso yohlobo oluthile lwamanzi oluvelisayo. Oko kuqala ngokufakwa kwezinto ze-phenolic kunye ne-fatty kwiindonga ze-radial zeeseli ekugqibeleni iba lilibhanti elidibanisa inwebu yeplasma ukwandisa ukutyeba kwayo. Siyakwazi ukubona iqela leCaspary ngokusebenzisa imicroscope usebenzisa idayi yemvelo ebizwa ngokuba yiSafranin. Eli bhanti linokuthiwa libhanti apho iindonga eziphambili zifakwe khona.
Umsebenzi webhendi yeCaspary
Makhe sibone ukuba yintoni na umsebenzi band Caspary kaThixo. Iqulathe ikakhulu i-suberin kwaye iyila enye into esebenza njengomqobo phakathi kwezityalo kunye nokusingqongileyo. Siyazi ukuba izityalo zifuna ukhuseleko oluthile zingonakaliswa ziiarhente zendalo ezikhoyo kwindalo esingqongileyo. Ukongeza, omnye wemisebenzi yayo kukungenelela ekuthuthweni kwamanzi kunye neeon ngokusebenzisa iapoplast yengcambu. Ikwa thintela izinto ukuba zingahambi ngale ndlela kwaye inyanzele ukuhanjiswa kwangaphakathi ngendlela elula.
I-Suberin yenziwe ngehydroxy, epoxy, kunye nedicarboxylic fatty acids. Ezi asidi zinamanqatha zigcwalisa indawo yenxalenye engaphezulu kwelinye icala leseli zezityalo. Oko kukuthi, kuthintela ukuhamba kwezinto phakathi kweendonga ze-endodermis kunye nolwelo olusemhlabeni luphela ludlula kwisytoplasm. Ngale ndlela, indawo enomdla yokukhetha yenzelwe isityalo. Yile ndlela isityalo esinokulawula ngayo ukuhamba kweeon, ukulawula ukungena kwamanzi kunye nezinye izinto zezimbiwa.
Ukuba siya kwi-endodermis yeseli, sinokubona ukuba kuphela kocingo lweseli oluthintela ukudlula kwezinto emhlabeni ukuya kwiinyanda zemithambo. I-endodermis igutyungelwe yi-cortex kwaye nangona ii-ions zeziyobisi zinokuhamba ngokulula phakathi kwe-rhizodermis kunye nesilinda yemithambo, abanako ukufikelela kule yokugqibela. Ngesi sizathu, umendo yindawo yesplast yesityalo okanye icytoplasm yesikhumba.
Caspary band kunye nokuthuthwa kwamanzi
Kwizityalo ezininzi amanzi angena kwiingcambu ngokwendalo. Akukho mfuneko yokuba kubekho inkcitho eyongezelelweyo yamandla ukuze amanzi angene ngeengcambu. Nangona kunjalo, ukuhamba kwamanzi kuqweqwe kunye nendawo yonke yangaphakathi kusebenzisa amandla ngakumbi kwaye kwenziwa iinkqubo ezahlukeneyo. Ukuhamba kwamanzi kwi-xylem kunokwenzeka ngeendlela ezimbini: I-apoplast kunye ne-syplast. Iqela leCaspary likho zombini. Siza kufunda nzulu ezi ndlela zimbini apho iqela leCaspary lifunyenwe:
Indlela yeApoplast
Ngummandla wesityalo ongahlali kwiprotoplast. Kuzo kukho iindawo ezingenanto ekubonakala ukuba zibekwe phakathi kweendonga zeseli naphakathi kweeseli ezahlukeneyo. I-apoplast yenye yeendawo zokufikelela zamanzi kunye nezinye izinto ezifakwe ngaphakathi kwisityalo. Le ndlela isebenza njengomjelo wecarbon dioxide kwi-chloroplast. ukufaka isandla kulungiso lwekhabhoni ngexesha lenkqubo yefotosinthesisi. Bayangenelela emva kokumelana nesityalo kwizinto ezahlukeneyo ze-phytopathogenic ezinokuthi zixinzelele kwimetabolism yeselula.
Kufuneka ithathelwe ingqalelo ukuba izithuba eziphakathi kweendonga zeseli kunye naphakathi kweeseli ziyagcwalisa njengeepolymers zezinto eziphilayo ezona zityebileyo. Ezi polymers zezinto eziphilayo ezenza ibhendi yeCaspary kwaye zithintela ukusasazeka kwamanzi kunye neeon. Ukuhanjiswa kwezi zinto nge-apoplast akunto, kuncinci kakhulu kunoko kwenzeka kwindlela enovelwano.
Indlela enemfesane
Inkqutyana ye-endodermis ithetha ukuba ekuphela kwendlela yothutho yi-syplast. Kulapha apho amanzi agqitha kwiimbumba ze-cytoplasmic kunye neeprotoplast zeeseli. Ithathwa njengezona zithuthi zisebenzayo kwaye Isuka kwiseli iye kwiseli isebenzisa umahluko kubuchule bamanzi. Sibonile ukuba wayene-apoplast enentshukumo yamanzi ngokusebenzisa amandla okubila. Oku kwenzeka ikakhulu emva kokuphulukana namanzi ngokuvula i-stomata.
I-syplast ziiprotoplast eziqhagamsheleneyo ezenza icytoplasm yeseli. Kwangelo xesha sinokubona ukuba badityaniswa yiplasmodesmata. Kukule ndawo apho amanzi ahamba ngokulula kunye nezinye iimolekyuli ezinobunzima beemolekyuli kunye nezinto.
Ndiyathemba ukuba ngolu lwazi unokufunda ngakumbi malunga neCaspary band kunye nokubaluleka kwayo kwizityalo.