Relationship Between Changes in Leaf Endogenous Hormone Contents and Senescence During Grain Filling Stage of a Rice Hybrid and its Parents-中国期刊网

摘要 Amajorprobleminhybridriceproductionistheoccurrenceofleafsenescenceduringthegrainfillingstagethatcanresultinreductionofyield.Changesincontentsofseveralendogenoushormonesarerelatedtoleafsenescence.TherelationshipbetweenendogenoushormonesandleafsenescenceinthericehybridTiyou418anditsparentsTijinandC418,wasundertakenforinvestigation.Indicatorsofleafsenescence,includingsuperoxidedismutase(SOD)activity,malondialdehyde(MDA)accumulationandchlorophyllcontent,aswellasthecontentsofabscisicacid(ABA),zeatinriboside(ZR),gibberellin(GA1/3)andauxin(IAA)intheleavesweredetermined.Differentratesofleafsenescencewereobservedinthethreematerials.SenescenceoccurredearliestandfastestinTijin,followedbyTiyou418andthenC418.AsimilartrendwasrecordedinABA,ZR,andIAAcontentsduringthegrainfillingstageinthethreematerials.Changesin(GA1/3+ZR+IAA)/ABAratioswerealsosimilar,beingquitestableduringtheearlystageofleafsenescence,anddecreasingmarkedlyduringthelatestage.TheratiodeclinedmoredramaticallyinTijin,inaccordancewithitsfasterleafsenescence.Theresultssuggestthattheratioof(GA1/3+ZR+IAA)/ABAregulateschlorophyllcontent,SODactivity,MDAcontentandmembranelipidperoxidation.Itispostulatedthatendogenoushormonesmayplayaroleintheregulationofleafsenescenceinasystematicway.

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Relationship Between Changes in Leaf Endogenous Hormone Contents and Senescence During Grain Filling Stage of a Rice Hybrid and its Parents

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Relationship Between Changes in Leaf Endogenous Hormone Contents and Senescence During Grain Filling Stage of a Rice Hybrid and its Parents

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