Masana ilmin halitta daga Jami’ar Kasa ta Singapore sun gano yadda tsire-tsire ke hana samuwar stomata da kuraje da ba za a iya gani ba a samansu don takaita asarar ruwa a lokacin fari, in ji rahotanni. Pys.org portal.
Stomata, wanda ke kan saman ganye, yana da mahimmanci ga musayar gas tsakanin tsire-tsire da yanayi. Sai dai kuma su ne manyan hanyoyin asarar ruwa idan ya bar ganye a matsayin tururin ruwa. Lokacin da rashin ruwa, tsire-tsire suna yin halayen stomatal guda biyu don kiyaye shi: suna rufe ramukan stomata da ke akwai kuma suna iyakance samuwar sababbi.
Waɗannan halayen, waɗanda ke yin sulhu ta hanyar abscisic acid (ABA), suna da mahimmanci don daidaitawar shuka zuwa fari kuma suna da mahimmanci musamman don kiyaye ingancin aikin gona a cikin canjin yanayi. Duk da haka, daidai yadda ABA ke hana samar da stomatal ba a yi nazari a baya ba.
A cikin sabon saki Kimiyyar Kimiyya Tawagar bincike karkashin jagorancin Mataimakin Farfesa LAU On Sun daga Sashen Kimiyyar Halittu a Jami'ar Kasa ta Singapore ta ba da rahoton tsarin da ke haifar da wannan matsala ta fari na hana ci gaban ciwon ciki.
Masana kimiyya sun gano cewa manyan kinases na sigina na ABA waɗanda fari ke kunna su kai tsaye suna yin phosphorylate mai sarrafa stomatal SPEECHLESS (SPCH). Phosphorylation yana nufin ƙari na ƙungiyar phosphate zuwa kwayoyin halitta. Wannan ABA-induced phosphorylation na furotin SPCH yana faruwa a wurare daban-daban guda biyu kuma yana haifar da lalacewa na SPCH.
Saboda SPCH yana haɓaka haɓakar stomatal, phosphorylation na SPCH ya haifar da raguwar matakan SPCH da lambar stomatal, da kuma kawar da waɗannan rukunin yanar gizon (samfurin S240/271A) ya haifar da akasin martani. Mahimmanci, masu binciken sun kuma nuna cewa tsire-tsire tare da canza wuraren SPCH phosphorylation sun nuna juriyar fari daban-daban.
Waɗannan sakamakon suna nuna cewa takamaiman “lambar” tana ƙarƙashin mahimmin amsawar shuka ga kiyaye ruwa. Ta hanyar sarrafa shi, za mu iya daidaita jurewar fari na shuke-shuken amfanin gona da taimaka inganta su don yanayin girma iri-iri, daga na al'ada zuwa noman birane.