Ithimba labacwaningi eliholwa yi-RIKEN lithole ukutholwa okungasetshenziswa ukuthuthukisa ukumuncwa kwezakhi zezitshalo.I-transporter ihlobene nokwehla kwezimpande zezitshalo ngenxa yamandla adonsela phansi.Lesi simo sibizwa ngokuthi i-root geotropism1.googletag.cmd.push(function(){googletag.display('div-gpt-ad-1449240174198-2′);});
UCharles Darwin wayengomunye wososayensi bokuqala abafunda amandla adonsela phansi ezimpande zezitshalo.Ngokuhlola okulula kodwa okuhle, uDarwin wabonisa ukuthi izimpande zezimpande zezitshalo ziyakwazi ukuzwa amandla adonsela phansi, futhi zingadlulisela izimpawu ezicutshini eziseduze, ngaleyo ndlela zigobe izimpande zibe namandla adonsela phansi.Manje siyazi ukuthi i-hormone yesitshalo i-auxin idlala indima ebalulekile kule mpendulo yamandla adonsela phansi.
Amahomoni ezitshalo anemisebenzi eminingi yokuphila komzimba futhi angasiza izitshalo ukumelana nokuguquguquka kwemvelo.Ukuze zisebenze kahle, ukusabalalisa nokusebenza kwazo kumaseli nezicubu kufanele kuklanywe ngokunembile.Lokhu kuvame ukubandakanya abathuthi abalamula ukutholwa kwamaselula noma ukuthekelisa kwamahomoni noma izandulela zawo.
Manje, izazi zebhayoloji ze-RIKEN zibonise ukuthi isithuthi esichazwe ngaphambilini i-NPF7.3 singalawula impendulo ye-auxin kanye namandla adonsela phansi ezimpandeni zesitshalo esiyimodeli i-Arabidopsis.
UMitsunori Seo we-RIKEN Sustainable Resources Science Center uthe: “Siqaphele ukuthi izithombo ezinoguquko ku-gene encoding NPF7.3 zibonisa ukukhula okungavamile kwezimpande.”“Ukuhlolisisa kwembula iphutha elithile ekuphenduleni amandla adonsela phansi, njengoba kwabikwa ngaphambili.Umsebenzi we-NPF7.3 njenge-nitrate ne-potassium transporter awukwazi ukuchazwa.Lokhu kusenza sisole ukuthi kungenzeka ukuthi leli phrotheni lineminye imisebenzi ebingakaze yenziwe ngaphambilini.”
Ukuhlola okwalandela kwabonisa ukuthi i-NPF7.3 isebenza njengesithuthi se-indole-3-butyric acid (IBA), kanye ne-IBA emuncwa amaseli athile ezimpande nge-NPF7.3 iguqulwa ibe i-indole-3-acetic acid (IAA), okuyi- main Umthombo wangaphakathi auxin.Lokhu kusiza ekusunguleni i-auxin gradient esicutshini sempande, yona eqondisa impendulo yamandla adonsela phansi.
I-IBA iyisandulela sesibili se-IAA, futhi indima ye-IAA etholakala ku-IBA ekuhambeni kwamandla adonsela phansi ibingaziwa ngaphambilini.Kodwa-ke, kubonakala sengathi ezinye izitshalo (kuhlanganise nezinhlobo zezitshalo) nazo zinezinqubo ezifanayo zokulawula, ezingase ziholele ekusetshenzisweni kwezolimo nezolimo.
USo uthe: "Sizokwazi ukuguqula ukwakheka kwezimpande ngokulawula ukudluliswa kwe-IBA."“Lokhu kuzothuthukisa ukumuncwa kwamanzi nemisoco ngohlelo lwezimpande, ngaleyo ndlela kukhuthaze ukukhiqizwa kwezitshalo.”
Amaprotheni e-NPF ekuqaleni ayehlonzwe njengabathutha i-nitrate noma i-peptide, kodwa kusobala ukuthi avumelana nezimo kunalokho obekucatshangwa ngaphambili.U-Seo wachaza: “Ucwaningo lwakamuva, kuhlanganise nalolu, luye lwabonisa ukuthi lo mkhaya we-transporter ungaletha izinhlobonhlobo zezinhlanganisela, kuhlanganise nama-hormone ezitshalo nama-metabolites esibili.”“Umbuzo omkhulu olandelayo uthi, sifuna ukwazi ukuthi iphrotheni ye-NPF ikubona kanjani lokhu.Ama-substrates amaningi. "
Ungaqiniseka ukuthi abahleli bethu bazoqapha ngokucophelela yonke impendulo ethunyelwayo futhi bazothatha isinyathelo esifanele.Umbono wakho ubaluleke kakhulu kithi.
Ikheli lakho le-imeyili lisetshenziselwa ukwazisa umamukeli kuphela othumele i-imeyili.Ikheli lakho noma ikheli lomamukeli ngeke lisetshenziselwe enye injongo.Ulwazi olufakayo luzovela ku-imeyili yakho, kodwa i-Phys.org ngeke ilugcine lunoma yiluphi uhlobo.
Thola izibuyekezo zamasonto onke kanye/noma zansuku zonke ezithunyelwa ebhokisini lakho lokungenayo.Ungazikhipha ohlwini noma nini, futhi ngeke sabelane ngemininingwane yakho nabantu besithathu.
Le webhusayithi isebenzisa amakhukhi ukusiza ukuzulazula, ukuhlaziya ukusebenzisa kwakho amasevisi ethu futhi inikeze okuqukethwe okuvela kwabanye abantu.Ngokusebenzisa iwebhusayithi yethu, uyaqinisekisa ukuthi ufundile futhi waqonda inqubomgomo yethu yobumfihlo kanye nemibandela yokusebenzisa.