Ntau cov paj ntoo (angiosperms) siv cov protein ntau ntawm cov photoreceptor, xws li as phytochrome lossis cryptochrome, kom nkag siab txog kev hloov pauv raws caij nyoog nyob rau hmo ntev, lossis photoperiod, uas lawv coj los ua lub cim rau paj..
Cov xim twg yog lub luag haujlwm rau kev kuaj pom lub sijhawm ntawm cov nroj tsuag?
Phytochrome yog cov xim cog qoob loo pom nyob rau hauv cov paj ntoo uas tuaj yeem kuaj pom qhov pom lossis tsis pom lub teeb thiab koom nrog kev tswj hwm ntau cov txheej txheem uas txuas rau hnub ntev (photoperiod) xws li Raws li cov noob germination thiab pib ntawm flowering i.e. photoperiodism.
cov nroj tsuag txiav txim siab photoperiod li cas?
Nyob rau hauv cov nroj tsuag no, qhov sib txawv ntawm photoperiod yog ntsuas los ntawm kev cuam tshuam ntawm circadian-clock-regulated Cheebtsam, xws li CONSTANS (CO), thiab lub teeb signaling. Cov kev sib cuam tshuam tshwm sim nyob rau hauv qee hnub ntev, raws li yav dhau los kwv yees los ntawm tus qauv sab nraud coincidence.
Dab tsi yog lub teeb receptors hauv cov nroj tsuag?
Nroj tsuag muaj ntau lub teeb xiav-ntsuab receptors, uas tswj hwm qhov sib txawv ntawm kev loj hlob thiab kev loj hlob. Cov kev tshawb fawb tsis ntev los no tau txheeb xyuas peb qhov receptors: cryptochrome 1, cryptochrome 2 thiab phototropin.
Qhov chaw ntawm kev nkag siab ntawm photoperiod hauv cov nroj tsuag yog dab tsi?
Qhov chaw nkag siab ntawm photoperiod yog leaves. Cov tshuaj hormone florigen, uas yog lub luag haujlwm rau paj, inducesflowering raws li nws migrate los ntawm nplooj mus tua apices ntawm induction ntawm yuav tsum tau photoperiods.
