Nroj tsuag yog elongated heev, khoov kom tso cai rau kev nkag tau ntawm tshav ntuj rau txhua nplooj ntawm lawv. Txawm hais tias saib qhov tshwm sim no rau ntau pua xyoo, cov kws tshawb fawb tsis nkag siab tag nrho. Tam sim no cov kws tshawb fawb ntawm lub koom haum Salk tau tshawb pom tias ob yam nroj tsuag - cov protein PIF7 thiab kev loj hlob hormone auxin - yog qhov ua rau kev loj hlob sai thaum cov nroj tsuag nyob hauv qhov ntxoov ntxoo thiab raug kub kub tib lub sijhawm. official lub website ntawm lub koom haum.
Cov kev tshawb pom, luam tawm nyob rau hauv phau ntawv Journal Nature Communications thaum Lub Yim Hli 29, 2022, yuav pab cov kws tshawb fawb kwv yees seb cov nroj tsuag yuav teb li cas rau kev hloov pauv huab cua thiab nce yields txawm tias lub ntiaj teb sov sov ua rau cov qoob loo puas tsuaj.
"Tam sim no, peb tab tom loj hlob cov qoob loo ntawm qhov ntom ntom, tab sis peb cov txiaj ntsig tau qhia tias peb yuav tsum txo qis qhov ceev kom txhim kho cov nroj tsuag kev loj hlob raws li kev hloov pauv huab cua," hais tias tus kws sau ntawv laus Joanne Chory, tus thawj coj ntawm Salk Institute's Plant Molecular thiab Cell Biology Laboratory thiab Howard, tus kws tshawb fawb ntawm Hughes Medical Institute. "Kev nkag siab txog lub hauv paus molecular ntawm yuav ua li cas cov nroj tsuag teb rau lub teeb thiab qhov kub thiab txias yuav tso cai rau peb kom zoo-tune cog ceev kom tsim tau qhov zoo tshaj plaws yields."
Thaum lub sij hawm germination, seedlings sai lengthen lawv stems kom tawg los ntawm cov av thiab ntes tshav ntuj kom sai li sai tau. Feem ntau, qia qeeb nws txoj kev loj hlob tom qab raug tshav ntuj. Tab sis lub qia tuaj yeem elongate sai dua yog tias cov nroj tsuag sib tw nrog cov nroj tsuag nyob ib puag ncig rau lub hnub ci lossis nce qhov kev ncua deb ntawm cov av kub thiab cov nroj tsuag nplooj hauv cov lus teb rau qhov kub thiab txias. Thaum ob qho tib si ib puag ncig - shading thiab kub kub - txhawb nqa txoj kev loj hlob, lawv kuj txo yields.
Nyob rau hauv txoj kev tshawb no, cov kws tshawb fawb piv cov nroj tsuag loj hlob nyob rau hauv ntxoov ntxoo thiab sov sov nyob rau tib lub sij hawm - tej yam kev mob uas mimic siab cog densities thiab huab cua hloov. Cov kws tshawb fawb tau siv cov qauv cog Arabidopsis thaliana, nrog rau cov txiv lws suav thiab cov txheeb ze ze ntawm kev haus luam yeeb, vim lawv xav pom tias tag nrho peb hom nroj tsuag puas sib npaug los ntawm cov xwm txheej no.
Nyob rau hauv tag nrho peb hom, pab pawg neeg tshawb fawb pom tias cov nroj tsuag loj hlob siab heev thaum lawv ib txhij sim zam qhov ntxoov ntxoo tsim los ntawm cov nroj tsuag nyob sib ze thiab raug rau qhov kub siab dua. Ntawm qib molecular, cov kws tshawb fawb pom tau tias PIF7 qhov kev hloov pauv, cov protein uas pab tig cov noob rau thiab tawm, pab txhawb kev loj hlob. Lawv kuj pom tias qib auxin, ib qho kev loj hlob hormone, nce ntxiv thaum cov qoob loo pom cov nroj tsuag nyob sib ze, uas txhawb kev loj hlob hauv cov lus teb rau qhov kub siab dua ib txhij. Txoj kev sib koom ua ke PIF7-auxin no tso cai rau cov nroj tsuag teb rau lawv ib puag ncig thiab hloov mus rau hauv kev tshawb nrhiav cov kev loj hlob zoo tshaj plaws.
Ib qho cuam tshuam txog kev sau ntawv, PIF4, kuj txhawb nqa qia elongation ntawm qhov kub thiab txias. Txawm li cas los xij, nrog kev sib xyaw ntawm qhov ntxoov ntxoo thiab qhov kub siab, qhov no tsis ua lub luag haujlwm tseem ceeb.
"Peb xav tsis thoob thaum pom tias PIF4 tsis ua lub luag haujlwm tseem ceeb vim tias cov kev tshawb fawb yav dhau los tau qhia qhov tseem ceeb ntawm qhov tseem ceeb hauv cov xwm txheej loj hlob," hais tias kev tshawb fawb thawj tus kws sau ntawv Yogev Burko, tus kws tshawb fawb ntawm Salk Institute thiab tus kws tshaj lij ntawm lub koom haum. Lub koom haum rau Kev Tshawb Fawb Kev Ua Liaj Ua Teb ntawm Israel Volcanoes Institute. "Qhov tseeb tias PIF7 yog tus tsav tsheb loj hlob rau cov nroj tsuag no yog qhov xav tsis thoob tiag. Nrog rau qhov kev paub tshiab no, peb cia siab tias yuav kho qhov kev loj hlob ntawm ntau cov qoob loo los pab lawv hloov pauv huab cua hloov pauv. "
Cov kws tshawb fawb ntseeg tias tseem muaj lwm qhov tseem ceeb uas tseem tsis tau tshawb pom uas ua kom muaj txiaj ntsig ntawm PIF7 thiab auxin. Lawv vam tias yuav tshawb nrhiav qhov tsis paub txog qhov no hauv kev tshawb fawb yav tom ntej. Berko's lab tseem yuav kawm seb txoj hauv kev no tuaj yeem ua kom zoo rau cov qoob loo.
Chori, tus thawj coj ntawm Salk Plant Use Initiative thiab Howard H. thiab Maryam R. Newman Chair ntawm Plant Biology hais tias "Lub ntiaj teb kub nce, yog li peb xav tau cov qoob loo zaub mov uas tuaj yeem loj hlob hauv cov xwm txheej tshiab no." "Peb tau txheeb xyuas cov ntsiab lus tseem ceeb uas tswj cov nroj tsuag loj hlob ntawm qhov kub thiab txias, uas yuav pab tau peb cog qoob loo ntau dua los pub rau tiam tom ntej."