乙矮合剂对不同密度夏玉米花粒期不同部位叶片衰老特性的影响

《乙矮合剂对不同密度夏玉米花粒期不同部位叶片衰老特性的影响》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、作物学报ACTAAGRONOMICASINICA2016,42(4):561573http://zwxb.chinacrops.org/ISSN0496-3490;CODENTSHPA9E-mail:xbzw@chinajournal.net.cnDOI:10.3724/SP.J.1006.2016.00561乙矮合剂对不同密度夏玉米花粒期不同部位叶片衰老特性的影响*卢霖董志强董学瑞李光彦中国农业科学院作物科学研究所/农业部作物生理生态与栽培重点开放实验室,北京100081摘要:为探讨乙矮合剂对密植夏玉米叶片衰老及后期早衰的调控机制,建立华北夏玉米区密

2、植高产稳产化学调控技术,以中单909和浚单20为材料,设置乙矮合剂(ECK)和密度梯度处理,研究密度梯度对夏玉米花粒期不同部位叶片衰老特性的影响与ECK的调控效应。结果表明,随密度增加,两品种花粒期单株叶面积减小且降幅增大;各叶位叶片的叶绿素相对含量和可溶性蛋白含量呈下降趋势;超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)活性呈降低趋势;丙二醛(MDA)含量则呈增高趋势;上述指标在叶位和品种间存在差异。ECK处理显著提高各密度不同部位叶片SOD、CAT、POD活性和叶绿素相对含量及可溶性蛋白含量,显著降低MDA含量;单株绿叶面积降–

3、2幅减小,叶片衰老进程延缓,衰老程度减轻。ECK处理后,较高密度群体下(7.5~10.5万株hm),中单909和浚单20较各自对照分别增产5.59%~6.63%和6.73%~8.10%。因此,采用合理的种植密度结合喷施乙矮合剂可作为华北夏玉米区高产栽培的重要技术措施。关键词:夏玉米;乙矮合剂;种植密度;叶片衰老;抗氧化酶EffectsofEthylene-Chlormequat-PotassiumonCharacteristicsofLeafSenes-cenceatDifferentPlantPositionsafterAnthesisunderDif

4、ferentPlantingDen-sities*LULin,DONGZhi-Qiang,DONGXue-Rui,andLIGuang-YanInstituteofCropScience,ChineseAcademyofAgriculturalSciences/KeyLaboratoryofCropEcophysiologyandCultivation,Beijing100081,ChinaAbstract:Inordertoexploretheeffectsofethylene-chlormequat-potassium(ECK)onleafaging

5、andearlysenescenceinsummermaize,andprovideatheoreticalbasisforhighandstableyieldsofsummermaizeunderhighplantingdensitybychemicalregula-tiontechnologyinNorthChinaPlain,afieldexperimentwasconductedusingtwotypesofmaizehybrids(Zhongdan909andXundan20)withtreatmentsofethylene-chlormequ

6、at-potassiumunderdifferentplantingdensities.Theresultsshowedthattheincreasedplantingdensitysignificantlydecreasedleafarea(LA)perplantandincreasedLAreductionrate.WiththeincreaseofplantingdensitydecreasedSPADvalue,solubleproteincontent,andactivitiesofsuperoxidedismutase(SOD),catala

7、se(CAT)andperoxidase(POD)ofearleaf,thethirdleafaboveear,andthethirdleafbelowear,whilemalondialdehyde(MDA)contentin-creased.Theaboveindexeshaddifferencesamongvarietiesandleafpositions.ECKtreatmentsignificantlyincreasedactivitiesofsuperoxidedismutase(SOD),catalase(CAT)andperoxidase

8、(POD),SPADvalueandsolubleproteincontenti