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Characteristics of photosynthesis and chlorophyll a fluorescence in Amorphophallus albus during vigorous growth under different light intensity* (PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2016 03
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Characteristics of photosynthesis and chlorophyll a fluorescence in Amorphophallus albus during vigorous growth under different light intensity*
FU Zhong123 XIE Shiqing12 XU Wenguo4 YAN Suo4 & CHEN Junwen123**
1Yunnan Research Center on Good Agricultural Practice for Dominant Chinese Medicinal Materials, Yunnan Agriculture University, Kunming 650201, China 2Institute of Konjac, Yunnan Agriculture University, Kunming 650201, China 3College of Agronomy and Biotechnology, Yunnan Agriculture University, Kunming 650201, China 4Extension Center of Agricultural Technology of Dehong Prefecture, Mangshi, Yunnan 678400, China
The objective of the present study was to investigate the adaptive mechanism of Amorphophallus albus to different light intensities during the of vigorous growth period. The parameters of photosynthetic gas exchange and chlorophyll a fluorescence were ana
S632.301 : Q945.79

The objective of the present study was to investigate the adaptive mechanism of Amorphophallus albus to different light intensities during the of vigorous growth period. The parameters of photosynthetic gas exchange and chlorophyll a fluorescence were analyzed in A. albus grown under three light intensities (high, moderate and low light) usually received by A. albus in agricultural production. The results showed significant increases in dark respiration rate and apparent quantum yield with the decrease of light intensity (P < 0.05). The maximums of photosynthetic rate (Amax), intrinsic water use efficiency and carboxylation efficiency were found in individuals growing under low light, while the maximums of light compensation point and CO2 compensation point were recorded in those under high light. The response to simulated sunfleck was quicker in individuals grown under high light; the time to reach 30%, 50% and 90% of Amax decreased with increased initial stomatal conductance (Gs-initial) during the process of photosynthetic induction. Maximum photochemical efficiency of PSII in the light (Fv′/Fm′), actual photochemical efficiency of PSII in the light (ΔF/Fm′), non-photochemical quenching (NPQ) and electron transport rate (ETR) were found to be higher in individuals grown under low light; higher proportion of light energy were partitioned to non-photochemical quenching (ФNPQ) in individuals grown under high light, however, higher proportion were allocated to photochemical quenching (ΦPSⅡ) in individuals grown under moderate and low light. The results suggest that A. albus grown under moderate or low light would possess higher photosynthetic capacity and display enhanced photoprotection by increasing the capacity of heat dissipation. Correspondingly, high-light-grown A. albus has a fast response to sunfleck, and enhanced transition of PSII inhibition state to avoid irreversible photodamage to photosynthetic apparatus.


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