Photoinhibition and photoprotection in senescent leaves of field-grown wheat plants

Lu, Qingtao; Wen, Xiaopeng; Lu, Congming; Zhang, Qide; Kuang, Tingyun

doi:10.1016/s0981-9428(03)00098-6

Cited by 32 publications

(18 citation statements)

References 21 publications

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“…In L2 layer leaves, the Φ PSII declined sharply under low light density, and the sensitivity of Φ PSII and ETR to high level of PPFD was much less than in L1 layer leaves. The downregulation of PSII photochemistry observed in the senescent leaves was in line with the studies on wheat (Lu et al 2003), as reflected in decreases in the efficiency of excitation energy capture by open PSII center, concurrent with decreases in q p . Under heat stress, this is a key biochemical protection mechanism against photodamage through a process of carotenoid-mediated dissipation of excess energy in the antennae complexes of PSII (Lu et al 2003).…”

Section: Discussionsupporting

confidence: 86%

Responses of leaf photosynthesis, pigments and chlorophyll fluorescence within canopy position in a boreal grass (Phalaris arundinacea L.) to elevated temperature and CO<sub>2</sub> under varying water regimes

Ge¹,

Zhou²,

Kellomäki³

et al. 2011

Photosynt.

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The effects of elevated growth temperature (ambient + 3.5 o C) and CO 2 (700 µmol mol −1 ) on leaf photosynthesis, pigments and chlorophyll fluorescence of a boreal perennial grass (Phalaris arundinacea L.) under different water regimes (well watered to water shortage) were investigated. Layer-specific measurements were conducted on the top (younger leaf) and low (older leaf) canopy positions of the plants after anthesis. During the early development stages, elevated temperature enhanced the maximum rate of photosynthesis (P max ) of the top layer leaves and the aboveground biomass, which resulted in earlier senescence and lower photosynthesis and biomass at the later periods. At the stage of plant maturity, the content of chlorophyll (Chl), leaf nitrogen (N L ), and light response of effective photochemical efficiency (Φ PSII ) and electron transport rate (ETR) was significantly lower under elevated temperature than ambient temperature in leaves at both layers. CO 2 enrichment enhanced the photosynthesis but led to a decline of N L and Chl content, as well as lower fluorescence parameters of Φ PSII and ETR in leaves at both layers. In addition, the downregulation by CO 2 elevation was significant at the low canopy position. Regardless of climate treatment, the water shortage had a strongly negative effect on the photosynthesis, biomass growth, and fluorescence parameters, particularly in the leaves from the low canopy position. Elevated temperature exacerbated the impact of water shortage, while CO 2 enrichment slightly alleviated the drought-induced adverse effects on P max . We suggest that the light response of Φ PSII and ETR, being more sensitive to leaf-age classes, reflect the photosynthetic responses to climatic treatments and drought stress better than the fluorescence parameters under dark adaptation. Abbreviations: Cars -carotenoid; Chl -chlorophyll; Chl a(b) -chlorophyll a(b); CON -ambient environment; EC -elevated CO 2 concentration; ET -elevated temperature; ETC -combination of temperature elevation and CO 2 enrichment; ETR -electron transport rate; F m -maximal chlorophyll fluorescence of dark-adapted state; F m ' -maximal chlorophyll fluorescence of light-adapted state; F 0 -minimum chlorophyll fluorescence of dark-adapted state; F 0 ' -minimum chlorophyll fluorescence of light-adapted state; F s -steady state fluorescence; F v /F m -maximal photochemical efficiency of PSII; g sat -light-saturated stomatal conductance; HW -high water level; LW -low water level; N L -leaf nitrogen; NW -normal water level; NPQ -nonphotochemical quenching; P max -maximum rate of photosynthesis; P N -net photosynthetic rate; PPFD -photosynthetic photon flux densities; PSII -photosystem II; q P -photochemical quenching; R D -dark respiration rates; RCG -Reed canary grass; Rubisco -ribulose 1,5-bisphosphate carboxylase/ oxygenase; RuBP -ribulose bisphosphate; α -apparent quantum yield; Φ PSII -the effective photochemical efficiency. Acknowledgments: This work was funded through the Finland Distinguished Professor Progra...

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Section: Discussionsupporting

confidence: 86%

Responses of leaf photosynthesis, pigments and chlorophyll fluorescence within canopy position in a boreal grass (Phalaris arundinacea L.) to elevated temperature and CO<sub>2</sub> under varying water regimes

Ge¹,

Zhou²,

Kellomäki³

et al. 2011

Photosynt.

View full text Add to dashboard Cite

show abstract

“…In old leaves, the Φ PSII declined rapidly under low PPFD, and the sensitivity of Φ PSII and ETR to high level of PPFD was much less than in leaves from the upper layer (young leaves). The down-regulation of PSII photochemistry observed in the senescent leaves was in line with the previous studies on wheat (Lu et al 2003). This can be seen also as a decrease in the efficiency of excitation energy capture by open PSII center, occurring concurrently with decreases in the q p (Paper III).…”

Section: Parameterssupporting

confidence: 90%

Seasonal responses of photosynthesis and growth of a bioenergy crop (Phalaris arundinacea L.) to climatic change under varying water regimes

Zhou¹

2011

Diss. For.

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“…Of note was a lower xanthophyll pool size (11 to 25%) and engagement state for the cultivar AC Andrew in comparison to the others (Table 4). Other field studies have found that an increase in NPQ by the induction of zeaxanthin and antheraxanthin directly increased photoinhibitory resistance, and it is likely that a similar process is occurring in the cultivars examined in this study (Lu et al 2001;Lu et al 2003;Martinez-Ferri et al 2004).…”

Section: Susceptibility To Photoinhibitionsupporting

confidence: 50%

Leaf photosynthetic properties and biomass accumulation of selected western Canadian spring wheat cultivars

Chytyk

Hucl²,

Gray

2011

Can. J. Plant Sci.

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Chytyk, C. J., Hucl, P. J. and Gray, G. R. 2011. Leaf photosynthetic properties and biomass accumulation of selected western Canadian spring wheat cultivars. Can. J. Plant Sci. 91: 305Á314. Current studies indicate wheat straw as a viable source for the production of cellulosic ethanol. Since photosynthetic performance impacts the overall success of the mature plant, this study aimed to measure the photosynthetic vigour of 11 spring wheat cultivars during field development as well as their biomass composition at maturity to determine which would be optimum for ethanol production. All cultivars had similar maximal quantum yields of photosystem II photochemistry (F V /F M ), normalized difference vegetation index and biomass composition in the field. However, differences were observed in photosynthetic rate, with McKenzie having the highest light-saturated maximal rate of CO 2 uptake (A max ) and apparent quantum yield of CO 2 uptake (F app CO 2 ), while also having the best water use efficiency. Snowbird was found to have the lowest CO 2 -compensation point (G*) and A max . Upon subjecting wheat samples to photoinhibitory conditions, McKenzie and Kyle were found to be the most resistant and susceptible, respectively, with a difference of 11% in F V /F M . Abundance of xanthophyll pigments were not found to be a contributing cause to differential photoinhibitory resistance as there was not a noticeable difference between cultivars. Although some cultivars were found to have enhanced photosynthetic traits over others, these were slight and did not contribute to changes in plant biomass. However, McKenzie did present a higher cellulose content, which would be favourable for ethanol production.

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Photoinhibition and photoprotection in senescent leaves of field-grown wheat plants

Cited by 32 publications

References 21 publications

Responses of leaf photosynthesis, pigments and chlorophyll fluorescence within canopy position in a boreal grass (Phalaris arundinacea L.) to elevated temperature and CO<sub>2</sub> under varying water regimes

Responses of leaf photosynthesis, pigments and chlorophyll fluorescence within canopy position in a boreal grass (Phalaris arundinacea L.) to elevated temperature and CO<sub>2</sub> under varying water regimes

Seasonal responses of photosynthesis and growth of a bioenergy crop (Phalaris arundinacea L.) to climatic change under varying water regimes

Leaf photosynthetic properties and biomass accumulation of selected western Canadian spring wheat cultivars

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