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植物研究 ›› 2014, Vol. 34 ›› Issue (2): 219-225.doi: 10.7525/j.issn.1673-5102.2014.02.013

• 论文 • 上一篇    下一篇

青杨雌雄扦插苗光合作用日变化与叶绿素荧光参数特征

贺俊东1,2;胥晓1,3*;郇慧慧1,2;杨帅1,2;秦芳1,2   

  1. 1.西华师范大学生命科学学院,南充 637009;2.西南野生动植物资源保护教育部重点实验室,南充 637009;3.西华师范大学珍稀动植物研究所,南充 637009
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2014-03-20 发布日期:2014-03-20
  • 通讯作者: 胥晓
  • 基金资助:
     

Characteristics of Chlorophyll Fluorescent Parameters and Daily Dynamics of Photosynthesis in Female and Male Populus cathayana Cutting Seedlings

HE Jun-Dong;XU Xiao;*;HUAN Hui-Hui;YANG Shuai;QIN Fang;   

  1. 1.College of Life Science,China West Normal University,Nanchong 637009;2.Ministry of Education Key Laboratory of Southwest China Wildlife Resources Conservation,Nanchong 637009;3.Institute of Rare Animals and Plants,China West Normal University,Nanchong 637009
  • Received:1900-01-01 Revised:1900-01-01 Online:2014-03-20 Published:2014-03-20
  • Contact: XU Xiao
  • Supported by:
     

摘要: 以青杨雌雄扦插苗为对象,探究其叶绿素荧光参数和光合作用日变化特征。结果表明:青杨扦插苗的PnTrGs日变化均呈“双峰”型曲线,有明显的“午休”现象,但是不同性别PnTrGs的高峰和低谷出现的时间和大小不同。青杨雌雄植株的WUEi从8:00开始降低到一个最小值后升高,且雌株在16:00出现1个峰值;雄株叶片的PnGsTrWUEiFmFoFm′、Fo′、Fv′/Fm′、ETR显著大于雌株(P<0.05),而NPQ则是雌株显著大于(P<0.05)雄株,CiLsFv/FmFv/FoФPSⅡqP性别间差异则不显著(P>0.05);相关性分析结果表明,对Pn影响最大的因子是Gs,其次是CaPARRHTaVPD。对Tr影响最大的因子是Gs,其次是CaRHPARTaVPD。可见,与雌株相比,青杨雄株的捕获光能效率、电子传递速率、光合效率以及水分利用效率较高,雄株对逆境适应能力更强。

关键词: 青杨, 雌雄异株, 光合速率, 叶绿素荧光, 环境因子

Abstract: A field research was conducted on the characteristics of chlorophyll fluorescent parameters and daily dynamics of photosynthesis in dioecious Populus cathayana cutting seedlings. The results showed as follows: The curves of diurnal variation in Pn, Tr and Gs of dioecious cutting seedlings leaves had two peaks, and a significant midday depression phenomenon, although there were differences in the time and the value of the peaks and valleys occurred in terms of Pn, Tr and Gs. WUEi decreased from morning to noon, reached the lowest value and then increase, he female individuals had the highest value of WUEi at 16:00; The photosynthetic indexes of male individuals such as Pn, Gs, Tr, WUEi, Fm, Fo, Fm′, Fo′, Fv′/Fm′ and ETR were significantly higher than those of female individuals (P<0.05), but significantly lower NPQ than female individuals. Moreover, the gender-pecific differences of male and female cutting seedlings in Ci, Ls, Fv/Fm, Fv/Fo, ФPSⅡ and qP were not significant (P> 0.05); Correlation analyses showed that the parameters affecting Pn could be ranked, from the highest to the lowest, as Gs>Ca>RH>VPD>Ta>PAR, and the factors Tr could be ranked as Gs>Ca>RH>VPD>PAR>Ta. The effects of climate factors on photosynthesis rate, transpiration rate of P.cathayana were obvious. Comparing with the female, the male had higher efficiency of light energy captured, electron transport rate, photosynthetic efficiency and water use efficiency, and thus, had greater resistance against adversity.

Key words: Populus cathayana, dioecious, photosynthetic rate, chlorophyll fluorescence, environmental factor

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