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Relationships between photosystem II efficiency and photochemical reflectance index under different levels of illumination: comparison among species grown at high- and low elevations through different seasons

机译:不同光照水平下光系统II效率与光化学反射指数之间的关系:高海拔和低海拔不同季节生长的物种之间的比较

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Previously, we found a significant association between photosystem II efficiency (ΦPSII) and photochemical reflectance index (PRI) measured at predawn among different species at different elevations and throughout several seasons. However, this relationship has not been evaluated under varied levels of illumination. Here, we used the Taiwan species Pinus taiwanensis (a conifer distributed at 750–3,000 m a.s.l.), Stranvaesia niitakayamensis (an evergreen tree, 1,700–3,100 m) and two Miscanthus spp. (perennial C4 Gramineae, coastline–3,200 m) to elucidate the ΦPSII–PRI relationship. We studied six levels of photosynthetic photon flux density (PPFD) (0, 200, 400, 800, 1,200 and 2,000 μmol m?2 s?1) over several growth seasons at high (2,600 m a.s.l.) and low (800 m a.s.l.) elevation sites. In comparing the same species or genus, ΦPSII and PRI were closely correlated in darkness or under the same level of PPFD, with data obtained from different seasons and elevations pooled for regression analysis. Because both the intercept and slope of the ΦPSII–PRI equation showed a negative curvilinear correlation with PPFD, we could fit an empirical regression model, ΦPSII = c + d·ln(PPFD) + e·[ln(PPFD)]2 + f·PRI + g·PRI·ln(PPFD) + h·PRI·[ln(PPFD)]2, for multiple regression analysis. Using this model, we found a close correlation between the estimated and measured ΦPSII (r 2 = 0.842?0.937, P < 0.001) for all four species examined and for mango (Mangifera indica) measured under both artificial illumination and sunlight (data from Weng et al. 2010). This empirical regression model could simulate both seasonal and diurnal variations of leaf-scale photosynthetic efficiency at high and low elevations.
机译:以前,我们发现在黎明前在不同海拔和不同季节的不同物种中,光系统II效率(ΦPSII)与光化学反射指数(PRI)之间存在显着关联。但是,尚未在变化的照明水平下评估这种关系。在这里,我们使用了台湾树种台湾松(一种针叶树,分布在750–3,000 m a.s.l.),台湾细枝龟(一种常绿的树,1,700–3,100 m)和两个芒草。 (多年生C4 禾本科,海岸线–3,200 m)来阐明ΦPSII-PRI关系。在高(2,600 m asl)的几个生长季节中,我们研究了六个水平的光合光子通量密度(PPFD)(0、200、400、800、1,200和2,000μmolm?2 s?1 ) )和海拔较低(海拔高度为800 m)。在比较相同物种或属时,ΦPSII和PRI在黑暗中或在相同PPFD水平下密切相关,并汇总了不同季节和海拔的数据进行回归分析。由于ΦPSII–PRI方程的截距和斜率均与PPFD呈负曲线相关,因此我们可以拟合经验回归模型,ΦPSII= c + d·ln(PPFD)+ e·[ln(PPFD)] 2 + f·PRI + g·PRI·ln(PPFD)+ h·PRI·[ln(PPFD)] 2 ,用于多元回归分析。使用该模型,我们发现在所考察的所有四个物种与在人工照明和阳光下测量的芒果(芒果)的估计和测得的ΦPSII(r 2 = 0.842?0.937,P <0.001)之间有着密切的相关性。 (数据来自Weng等,2010)。该经验回归模型可以模拟高海拔和低海拔下叶片尺度光合效率的季节性和昼夜变化。

著录项

  • 来源
    《Trees》 |2012年第2期|343-351|共9页
  • 作者单位

    Graduate Institute of Ecology and Evolutionary Biology China Medical University Taichung Taiwan;

    Department of Life Science National Chung-Hsing University Taichung Taiwan;

    Department of Life Science National Chung-Hsing University Taichung Taiwan;

    Department of Life Science National Chung-Hsing University Taichung Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Altitude; Photosystem II efficiency; PPFD; PRI; Season; Species;

    机译:海拔;Photosystem II效率;PPFD;PRI;季节;种类;

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