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时间:2019-01-09
《小麦品种郑麦9023主茎叶片发育的积温需求》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、小麦品种郑麦9023主茎叶片发育的积温需求 摘要:通过播期和密度两因素试验,对小麦主栽品种郑麦9023不同播期和密度条件下的叶片发育进程进行了比较,对小麦主茎叶龄指数与有效积温的关系进行了研究,并对影响叶热间距的因素进行了分析。结果表明,播期对郑麦9023叶片发育进程影响极显著,密度对郑麦9023前期叶龄指数无显著影响,但在中后期对叶龄指数有显著的影响,播期和密度之间无显著互作。不同播期前期主茎叶龄指数与有效积温呈明显的线性关系,R2为0.9919~0.9963,均高于0.9900,直线斜率为0.0093~0.0109。在2月23日后,不同播期的郑麦9023叶龄指数增速明显放缓,显著偏离
2、原来的直线。所有处理郑麦9023叶热间距的平均值为99.5℃/叶,叶热间距随播期推迟而降低,随密度增加而增加,但相对于播期而言,密度对叶热间距的影响相对较小。播种后的平均气温、冬季田间总分蘖数AUNTC与叶热间距均呈显著正相关。早播小麦经历的前期高温可能是造成其叶热间距较大的原因;茎蘖数过多引起的光合效率下降,分蘖与主茎的养分竞争可能是引起主茎叶热间距增加的因素。基因型对秋播春性小麦叶热间距的影响有待下一步研究。 关键词:秋播春性小麦;叶片发育;叶龄指数;积温;叶热间距 中图分类号:S512.1文献标识码:A文章编号:0439-8114(2015)24-6181-07 DOI:10.
3、14088/j.cnki.issn0439-8114.2015.24.02015 Abstract:Anexperimentwith4differentsowingdatesand3plantdensitiesforadominantwheatvarietyZhengmai9023wasconducted.ThedevelopmentprocessofthemainstemleavesofZhengmai9023indifferenttreatmentswerecomparedandtherelationshipsbetweenthemainstemleafageindexesofZhe
4、ngmai9023andtheeffectiveaccumulatedtemperaturewasanalyzed.Thephyllochronintervalswereobtainedandtheirinfluencingfactorswerealsodiscussed.Theresultsshowedthat,thedevelopmentprocessofthemainstemleavesofZhengmai9023washighlysignificantlyinfluencedbythesowingdate.Bycontrast,theplantdensityhadnosignifi
5、canteffectonthatbeforeJanuary22nd.TheinteractionbetweensowingdateandplantdensityeitherhadnosignificanteffectonthedevelopmentprocessofthemainstemleavesofZhengmai9023.Linearregressionswerealwaysobservedbetweenthemainstemleafageindexesandtheeffectiveaccumulatedtemperatureunderdifferentsowingdatesduri
6、ngearlierandmiddleperiodofplantgrowth.Thescoperangedfrom0.0093to0.0109andR2rangedfrom0.9919to0.9963,withnolessthan0.9900.TheincreaserateofthemainstemleafindexesofZhengmai9023significantlydecreasedafterFebruary23rd,withasignificantdeviationfromoriginalstraightline.Theaveragephyllochronintervalacros
7、sdifferenttreatmentswascalculatedas99.5℃per15leaf.PhyllochronintervaldecreasedassowingtimeofZhengmai9023delayed,whileitbecamehigherasplantdensityincreased.Theeffectofplantdensityonphyllochronintervalwasrelatively
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