香果树(Emmenopterys henryi)幼苗生长特性和叶绿素荧光对不同光强的响应  

Responses of growth and chlorophyll florescence of Emmenopterys henryi seedlings to different light intensities

作　　者：刘鹏[1] 康华靖[1,2] 张志详[1] 徐根娣[1] 张争艳[1] 陈子林 廖承川 陈卫新 

机构地区：[1]浙江师范大学植物学实验室,金华321004 [2]温州市绣山中学,温州325027 [3]大盘山国家级自然保护区管理局,磐安322300 [4]九龙山国家级自然保护区管理局,遂昌323300

出　　处：《生态学报》2008年第11期5656-5664,共9页Acta Ecologica Sinica

基　　金：浙江省自然科学基金资助项目(399277);金华市科技重点资助项目(2005-1-318)~~

摘　　要：研究了室内人工气候箱中相对高、中和低((5000±230)lx、(2200±110)lx和(1000±80)lx)光强下香果树幼苗的生长特性及荧光参数的动态变化,结果表明,中光强下的幼苗生长迅速,株高和生物量一直维持最高水平;高光强下的幼苗,生长极其缓慢,株高和生物量均处于最低水平;低光强下的幼苗比叶面积最大;而根冠比则以高光强下的为最高;叶绿素(a+b)含量在低光强下最高,中光下次之,强光下最小。前期,低光强下幼苗叶片的叶绿素a/b值较大,随着幼苗的生长呈下降的趋势,120d后与其他处理相比达到最小。荧光参数的结果显示,高光强下,香果树幼苗的电子传递速率(ETR)、光化学猝灭系数(qP)和非光化学猝灭系数(qNP)均处于最低水平,而测定初始荧光(Fo)和最大荧光(Fm)却处于最高水平,在低和中光强下则刚好相反。由此可见,高光强对香果树幼苗生长极其不利,而低和中光强下生长较好。建议在室内培育香果树幼苗时,适当减弱光强,保证其正常生长。Emmenopterys henryi Oliv., an endemic species in China, is one of the Chinese national second-grade state protection wild plants. Considering it is a particular rare, highly endangered plant, the conservation of E carried out without delay. The purpose of this paper was to determine the effect of different light morphological and physiological responses of E. henryi and offer some suggestion for the conservation. henryi should be intensities on the Based on indoor culture under different light intensities （i. e. （5 000 ±130） lx, （2 200 ± 110） lx and （ 1 000 ± 80） ix）, the changes of the growth characteristics and chlorophyll fluorescence of E. henryi seedlings were studied, respectively. The results showed that plant height and biomass maintained at the highest levels under middle light intensity （ （2 200 ± 110） lx）, while at the lowest levels under high light intensity （ （5 000 ± 130） lx）. The specific leaf area （SLA） was the highest under low light intensity （ （ 1 000 ± 80 ） lx）, whereas, the root/shoot ratio was the highest in high light intensity. The content of chlorophyll （ a ＋ b） decreased with increasing the light intensity. The value of chlorophyll a/b under low light intensity was relatively higher at first, followed by decreasing to the lowest level after 120 days. The measurements of chlorophyll fluorescence parameter showed that the electronic transfer rate （ETR）, the photochemical quench （qP） and the non- photochemical quench （qNP） of E. henryi seedlings under high light intensity were all the lowest at all times, while the initial fluorescence （Fo） and maximum fluorescence （Fm） were the highest. The results were opposite in low and middle light intensities. By synthesizing the results, it is concluded that the seedlings of E. henryi will grow better in relatively low light environment （2 200lx） when cultured in the indoor.

关 键 词：香果树 幼苗 不同光强 生长特性 荧光参数 

分 类 号：Q945[生物学—植物学]