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Physiologyofrootsystem,especiallyrootsystemactivity,isaveryimportantphysiologicaltraitofrice,whichdi rectlyaffectsricegrowthanddevelopmentoftheaerialpartsandyield.Inter_subspecifichybridriceIIyou2070andIIyou419,aswellastheirrestorerlines2070andZhong419,we