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- W2388973896 abstract "Acclimation to growth light environment was explored under 100%, 50%, 25% and 8% daylight for seedlings of Pometia tomentosa . Under 100% daylight P.tomentosa could reduce light interception through increasing leaf midrib angle (MA) and lamina mass per unit area (LMA) (Fig.1), and through decreasing leaf nitrogen allocation to light harvesting pigment complex (Fig.4), and increase heat dissipation through increasing carotenoid content (Figs.3 and 5). Even so, severe photoinhibition occurred under that condition (Fig.5). In addition to photoinhibition, the ratio of leaf nitrogen allocated to photosynthetic apparatus was the smallest among the four kinds of light treatments (Fig.4). All those were associated with the lowest maximal photosynthetic rate ( P max ) and with the worst growth performance under 100% daylight. Under 8% daylight P.tomentosa could increase light interception through decreasing MA, LMA, and leaf turning (Fig.1), and through increasing leaf nitrogen allocation to light harvesting pigment complex (Fig.4). Compared to other light treatments, under 8% daylight the efficiency of light energy conversion and light utilization were higher, while excess light energy and heat dissipation were lower (Fig.5). But electron transport rate was lower due to lower light intensity (Fig.5). The shortage of light energy limited carbon assimilation, and growth performance of P.tomentosa under 8% daylight. Under 50% and 25% daylight the ability to intercept, utilize and dissipate light energy was higher in P.tomentosa , so P.tomentosa could grow best. In conclusion, MA, LMA and leaf nitrogen allocation in different part of photosynthetic apparatus played important roles in acclimation to growth light environment in P.tomentosa , the roles of other physiological variables measured in this study were small, and their changes were mainly caused by LMA." @default.
- W2388973896 created "2016-06-24" @default.
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- W2388973896 date "2003-01-01" @default.
- W2388973896 modified "2023-09-23" @default.
- W2388973896 title "Morphological and Physiological Acclimation to Growth Light Intensities in Pometia tomentosa" @default.
- W2388973896 hasPublicationYear "2003" @default.
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