脱叶剂对机采棉种子活力及贮藏物质含量的影响

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Abstract：[Objective]Thisstudyaimedtoinvestigatetheeffectsofdiferentdefoliantsontheseedvigorandstoragesubstance contentofmachine-harvestedcotonseedswithdiferentmaturities，providingreferencesfortherationalselectionofdefoliants incotonproduction.[Methods]FieldexperimentswereconductedinSheziCity，Xinjiang，from020toO21.Themanplot involvedtheapplicationoftwodiferentdefoliants：RuituolongandYeluokong.Thesubplots included twocoton materials：an early-maturingvarietyidamian268（S68），andaate-maturingline，damian451（451）.OnSeptember27，oobols thathaddevelopedfor30d，35d，40d，45d，and 50d onAugust 31 （the first application of defoliant）were harvested. Naturally-openedcottnbollsbeforedefoliantapplicationservedasthecontrol（CK）.Seedcoatcolorwasobsered，andseed index，seedspecificightoiltentandproteinotentreeasred.Seedermiatioprcetage，nationotetial

germination index，and vigor index were determined at 18°C and 28°C .[Results] Compared with CK，the white seed rate （the proportionofimmatureseeds）of30-daybollsand35-daybolsofS268significantlyincreasedunderRuituolongandYeluokong treatments;whiletheblack-brownseedrate（theproportionofmatureseeds），sedindex，sedspecific weight，proteincontent， oilcontent，geminationpercentage，germinationindex，andigorindexofotonseedsallgnificantlyecreasedinand 2021.For S451，the white seed rate ofbollsat 30 d， 35d and 40d significantly increased;while the black-brownseed rate，seed index，seedspecificweight，proteincontent，oilcontent，germinationpercentage（exceptfore4-daybolls），gemination potential （except for the 40-day bolls at 28°C ），germination index，and vigor index of seedsall significantly decreased.After sprayingRuituolongandYeluokong，therewerenosignificantdiferencesintheblack-brownseedrate，germinationpercentage， andgerminationpotentialfor45-dayand50-daycotonbolsofS268andS451comparedwithCK;aswellastheseedil contentand proteincontentof50-daycottonbollscompared withCK.ForS268and S451，comparedwith Ruituolong，the black-brownseedrateof30-daybolls，seedindexof50-daybols，proteincontentof35-daybolls，seedgerminationindexof 35-day bollsat 28°C ，and vigor index of 40-daybolls at 18°C all significantly decreased.[Conclusion] Under the conditions of this experiment，thesuperiordefoliant was Ruituolong.SprayingRuituolong hadarelatively minorimpactonseed vigorand the content of storage substances of 45-50 days cotton bolls.

Keywords：cotton;defoliant; mechanical harvesting;seed vigor;protein content; oil content

棉花原产于热带、亚热带地区，喜温好光，具有无限生长习性。（剩余17315字）