小麦品种郑麦9023主茎叶片发育的积温需求

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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