Thaum nroj tsuag ntsej muag sib tw muaj xws li drought, salinity, lossis huab cua sov heev,ntaussawv thiab ua lawv cov kev tiv thaiv kab mob capwalys enzygiat ua kom muaj kev ntxhov siab ntau ntxiv; oxidative kev puas tsuaj.it yog lub xub ntiagntausUas ua rau cov nroj tsuag kom muaj sia nyob rau ntawm kev ua yeeb yam hauv kev txom nyem thiab tswj lub hauv paus ntawm lub neej.
Tus nqi ntawm kev twv tsis yog xav txog nws qhov kev tiv thaiv thaum lub sijhawm muaj kev sib raug zoo, tswj cov photosynthetic ua rau cov nroj tsuag cleporoplast, thiab txuas ntxiv muab lub zog rau cov nroj tsuag; raws li kev piav qhia molecule,ntaustseem tuaj yeem txhawb nqa cov nqus thiab ntev}} Kev siv cov khoom siv ntawm cov hauv paus hniav ntxiv, thiab cov khoom siv tshuaj lom neeg ua kom lub neej tsis tseem ceeb.
Vim nws cov kev ntxhov siab zoo heev thiab kev tsim txom cov khoom siv tshuaj tua kab mob thiab ua kom muaj kev nyab xeeb rau cov neeg muaj sia nyob, nws tuaj yeem hloov kho cov qoob loo tam sim no, nws tuaj yeem hloov kho cov kab mob zoo li qub, nws tuaj yeem hloov kho cov kab mob ntuj tam sim no, nws tuaj yeem hloov kho cov kab mob ntuj tam sim no, nws tuaj yeem hloov kho cov kab mob zoo niaj hnub no, nws tuaj yeem hloov kho cov kab mob ntuj tam sim no, nws tuaj yeem hloov kho qee yam muaj zog, nws tuaj yeem hloov kho cov kab mob zoo nkauj, nws tuaj yeem hloov kho cov kab mob tam sim no, nws tuaj yeem hloov kho cov kab mob ntuj tam sim no, nws tuaj yeem hloov kho cov kab mob ntuj tam sim no, nws tuaj yeem hloov kho qee yam yog tias muaj kev nyab xeeb zoo tshaj plaws, tsis muaj residual kev pheej hmoo, thiab cov kev cia siab rau hauv thaj teb ntawm cov organic thiab ecological ua liaj ua teb. Nws tsis yog tsuas yog cov neeg saib xyuas kev cuam tshuam hauv kev teeb meem ntawm tsob ntoo ntawm tsob ntoo, tab sis kuj yog "tus saib xyuas" ntawm kev ua liaj ua teb kom ruaj khov yav tom ntej.
