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冬前积温对小麦光能利用率的调控效应
Regulating Effect of Accumulated Temperature Prior to Wintering of Light Use Efficiency in Winter Wheat( Triticum aestivum L. )
【摘要】 为进一步明确不同春化发育特性小麦品种适宜播种期,以春性品种兰考矮早8和半冬性品种周麦18为试验材料,通过分期播种设置3个不同的冬前积温处理,即674~702℃(HAT)、556~587℃(MAT)和456~468℃(LAT),测定不同冬前积温处理的群体发展动态和冠层透光率、群体光合速率、叶绿素荧光参数及光能利用率。结果表明,兰考矮早8 MAT、周麦18 HAT,生育期内有较高的LAI,截获太阳辐射的比例大,分蘖成穗多,生育后期群体光合速率较高;冬前积温对Fv/Fm无显著影响,但兰考矮早8的HAT和MAT和周麦18 HAT的Fv/F0及孕穗期到灌浆初期的qP值和ETR,均大于LAT。两品种的光能利用率,在播种至起身随冬前积温的减少而减小,起身至灌浆中期,以兰考矮早8 MAT和周麦18 HAT最高。播种到起身光能利用率低下是全生育期光能利用率低的原因之一,兰考矮早8冬前积温556~587℃、周麦18冬前积温674~702℃时,冠层群体和籽粒的光能利用率最高。
【Abstract】 In order to provide the scientific basis for determining of sowing dates for different cultivars which with the different vernalizing characters, two cultivars, which are spring-type ‘Lankao Aizao8 ’ and semi-winter-type‘Zhoumai18’,were subjected to the three accumulated temperature treatments which are 674℃ ~702℃( HAT),556℃~ 587℃( MAT) and 456℃ ~ 468℃( LAT) as well as different sowing dates. The results showed that compared with samples from LAT,LAI,canopy interception of radiation,spikes per unit soil area,and population photosynthetic rate increased for ‘Lankao Aizao8 ’in MAT and for ‘Zhoumai18 ’in HAT. Fv/Fmwas not influenced significantly by accumulated temperature prior to wintering. Fv/F0,qPand ETR from booting to early grain-filling stage for ‘Lankao Aizao8’under HAT and MAT and for‘Zhoumai18’under HAT were more higher than under LAT. With decreasing of accumulated temperature prior to wintering,LUE( light use efficiency) for the two cultivars from sowing to starting jointing stage reduced. From starting jointing to mid-grain-filling stage,LUE for ‘Lankao Aizao8 ’in MAT and for‘Zhoumai18’in HAT reached the maximum. It was indicated that LUE from sowing to starting jointing stage accounted for low LUE during the whole growing period. A conclusion may be drawn that‘Lankao Aizao8’and‘Zhoumai18’have a maximum LUE with an accumulated temperature prior to wintering of 556 ~ 587℃ and 674 ~ 702℃,respectively.
【Key words】 Wheat; Accumulated temperature prior to wintering; Light use efficiency; Photosynthetic rate; Regulating effect;
- 【文献出处】 核农学报 ,Journal of Nuclear Agricultural Sciences , 编辑部邮箱 ,2014年08期
- 【分类号】S512.1
- 【被引频次】5
- 【下载频次】261