Biologists los ntawm National University of Singapore tau tshawb pom yuav ua li cas cov nroj tsuag txwv kev tsim ntawm stomata thiab microscopic pores ntawm lawv qhov chaw kom txwv tsis pub dej poob thaum lub caij ntuj qhuav, ceeb toom Pys.org portal.
Stomata, uas muaj nyob rau saum npoo ntawm nplooj, yog qhov tseem ceeb rau kev sib pauv roj ntawm cov nroj tsuag thiab cov cua. Txawm li cas los xij, lawv kuj yog qhov tseem ceeb ntawm kev poob dej thaum nws tawm ntawm nplooj raws li dej vapor. Thaum tsis muaj dej, cov nroj tsuag ua ob txoj hauv kev los tiv thaiv nws: lawv kaw lub qhov hws ntawm cov stomata uas twb muaj lawm thiab txwv kev tsim cov tshiab.
Cov tshuaj tiv thaiv no, uas yog kho los ntawm abscisic acid (ABA), yog qhov tseem ceeb rau kev hloov pauv ntawm cov nroj tsuag rau drought thiab tseem ceeb tshwj xeeb rau kev tswj xyuas kev ua liaj ua teb hauv kev hloov pauv huab cua. Txawm li cas los xij, raws nraim li cas ABA inhibits stomatal ntau lawm tsis tau kawm yav dhau los.
Nyob rau hauv qhov tseeb tso tawm Kev Txhawb Kev Tshawb Fawb Ib pab neeg tshawb fawb coj los ntawm Associate Professor LAU On Sun los ntawm Kws qhia ntawv ntawm Biological Sciences ntawm National University of Singapore tau tshaj tawm cov txheej txheem hauv qab no kev tiv thaiv kev kub ntxhov ntawm kev loj hlob hauv plab.
Cov kws tshawb fawb tau tshawb pom tias qhov loj ABA signaling kinases uas tau qhib los ntawm drought ncaj qha phosphorylate tus tswv stomatal regulator SPEECHLESS (SPCH). Phosphorylation yog hais txog kev sib ntxiv ntawm ib pab pawg phosphate rau ib lub molecule. Qhov no ABA-induced phosphorylation ntawm SPCH protein tshwm sim ntawm ob qhov chaw sib txawv thiab ua rau degradation ntawm SPCH.
Vim tias SPCH txhawb kev loj hlob ntawm stomatal, phosphorylation ntawm SPCH ua rau txo qis SPCH qib thiab stomatal tooj, thiab tshem tawm ntawm cov chaw no (piv txwv S240/271A) ua rau cov lus teb rov qab. Qhov tseem ceeb, cov kws tshawb fawb kuj tau pom tias cov nroj tsuag uas hloov pauv SPCH phosphorylation qhov chaw nthuav tawm txawv drought kam rau ua.
Cov txiaj ntsig no qhia tau tias ib qho "code" qhia txog cov lus teb tseem ceeb ntawm cov nroj tsuag rau kev txuag dej. Los ntawm kev tswj hwm nws, peb tuaj yeem kho qhov drought kam rau ua ntawm cov nroj tsuag qoob loo thiab pab txhim kho lawv rau ntau yam kev loj hlob, los ntawm cov pa mus rau hauv nroog ua liaj ua teb.