Photosynthetic Acclimation of Silene Dioica to Growth in Fluctuating Light

Yin, Zu-Hua; Johnson, Giles N.

doi:10.1007/978-94-011-3953-3_533

Cited by 34 publications

(57 citation statements)

References 6 publications

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“…Previous work on Ws has shown that growth from seed under a range of different irradiances results in clear developmental acclimation of photosynthesis, with different responses being seen in different irradiance ranges (Bailey et al, 2001). Yin and Johnson (2000) observed dynamic acclimation in Ws. When plants of Ws were transferred from 100 to 400 mmol m 22 s 21 , there was a small (approximately 10%) increase in photosynthetic capacity within the first photoperiod; however, this difference was no longer apparent by the following day (Fig.…”

Section: Resultsmentioning

confidence: 91%

“…As has been previously noted (Piippo et al, 2006) responses to increases in light need to be distinguished from the effects of extreme excess light liable to cause oxidative stress. In our study, conditions were selected that did not induce stress or, indeed oversaturate photosynthesis (Yin and Johnson, 2000), and few commonly described stress-responsive genes were altered in expression (see Supplemental Table S1). Rather, we have focused specifically on dynamic changes in photosynthetic capacity to nonstressing irradiances.…”

Section: Discussionmentioning

confidence: 99%

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Dynamic Acclimation of Photosynthesis Increases Plant Fitness in Changing Environments

et al. 2009

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Plants growing in different environments develop with different photosynthetic capacities—developmental acclimation of photosynthesis. It is also possible for fully developed leaves to change their photosynthetic capacity—dynamic acclimation. The importance of acclimation has not previously been demonstrated. Here, we show that developmental and dynamic acclimation are distinct processes. Furthermore, we demonstrate that dynamic acclimation plays an important role in increasing the fitness of plants in natural environments. Plants of Arabidopsis (Arabidopsis thaliana) were grown at low light and then transferred to high light for up to 9 d. This resulted in an increase in photosynthetic capacity of approximately 40%. A microarray analysis showed that transfer to high light resulted in a substantial but transient increase in expression of a gene, At1g61800, encoding a glucose-6-phosphate/phosphate translocator GPT2. Plants where this gene was disrupted were unable to undergo dynamic acclimation. They were, however, still able to acclimate developmentally. When grown under controlled conditions, fitness, measured as seed output and germination, was identical, regardless of GPT2 expression. Under naturally variable conditions, however, fitness was substantially reduced in plants lacking the ability to acclimate. Seed production was halved in gpt2™ plants, relative to wild type, and germination of the seed produced substantially less. Dynamic acclimation of photosynthesis is thus shown to play a crucial and previously unrecognized role in determining the fitness of plants growing in changing environments.

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Section: Resultsmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Dynamic Acclimation of Photosynthesis Increases Plant Fitness in Changing Environments

et al. 2009

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“…This photosynthetic plasticity in response to patterns of dynamic irradiance is an unexpected result (compared with: Sims and Pearcy 1993;Watling et al 1997;Leakey et al 2002). However, Yin and Johnson (2000) demonstrated the potential of higher plants to acclimate specifically to different sunfleck sequences. Only 7 days after transfer from low uniform irradiance, acclimation was generally greater under long, low frequency flecks compared to short, high frequency flecks.…”

Section: Photosynthetic Plasticitymentioning

confidence: 84%

Patterns of dynamic irradiance affect the photosynthetic capacity and growth of dipterocarp tree seedlings

2003

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In the deeply shaded understorey of S.E. Asian rain forests the growth and survival of dipterocarp seedlings is limited by their ability to maintain a positive carbon balance. Photosynthesis during sunflecks is an important component of carbon gain in understorey plants. To test the sensitivity of photosynthesis and growth to variation in the pattern of dynamic irradiance, dipterocarp tree seedlings (Shorea leprosula and Hopea nervosa) were grown for 370 days under shaded forest light treatments of equal total daily photosynthetic photon flux density (~3.3 mol m -2 day -1 ), but characterised by either long flecks (LF) or short flecks (SF). Seedling growth was more than 4-fold greater under LF, compared with SF, in both species. Variation in the relative growth rates (RGR) and light saturated rates of photosynthesis (A max ) were strongly positively correlated with the mean duration of sunflecks. Variation in RGR was strongly correlated with greater unit leaf rate growth, indicating that photosynthetic carbon gain per unit leaf area was greater under LF. The accumulation of starch in leaves over the diurnal period was 117% greater in both species under LF, compared with SF. Greater carbon gain in seedlings under LF is likely to have resulted from the combination of (1) greater A max (S. leprosula 35%, H. nervosa 40%), (2) more efficient dynamic photosynthesis, and (3) greater incident photosynthetic quantum yield, compared with seedlings receiving the SF irradiance treatment. The pattern of dynamic irradiance received by seedlings may significantly impact their growth and survival to a previously unrecognised extent, with important consequences for regeneration processes and hence forest structure and composition.

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“…During a portion of each day, enough light could penetrate the canopy to confound the degree of low light acclimation shade leaves could attain. Leakey et al (2003) and Yin and Johnson (2000) reported fluctuating light levels affected the acclimation response of plants grown in shade and subsequently exposed to sunlight. Since most leaves on trees used in our study were newly developed after a frost the year before, any acclimation response of shade leaves was likely muted.…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll a + b Content and Chlorophyll Fluorescence in Avocado

Reed¹,

Schnell²,

Moore³

et al. 2012

JAS

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Tonnage (T), Simmonds (S) avocado trees, and TxS crosses were evaluated for differences in chlorophyll content and maximal quantum yield of photosystem II in sun and shade-type leaves. Total chlorophyll content by area (Chl a+b ar ) ranged from 984 mg m -2 in TxS240 to 4320 mg m -2 in Simmonds. Chlorophyll a/b ratio (Chl a/b) ranged from 9.8 to 5.5 in TxS238 and TxS243, respectively. Tonnage and Simmonds had similar Chl a/b with a wide range in values found among the avocado trees tested. Shade leaves contained more Chl a, Chl b and Chl a+b wt than sun leaves. Differences in Chl a/b were insignificant or greater in shade adapted leaves for all trees except TxS238; this did not follow the expected sun/shade pattern. A low chlorophyll a/b ratio indicates more light harvesting proteins and higher stacking of thylakoids. Chl a+b ar indicates Simmonds, Tonnage and to a lesser extent TxS238 had dense packing of chloroplasts in both sun and shade adapted leaves. Shade leaves had more efficient Fv/Fm values than those adapted to sun for all varieties except TxS240. Tonnage had the largest range of total chlorophyll content between shade and sun adapted leaves and likely has the largest genetic variation in its ability to acclimate to changing light intensities. The range in efficiency of photosystem 11 found between the avocado trees tested indicates a potential for improvements through selective breeding. More research is needed to evaluate the entire USDA avocado germplasm collection for traits associated with photosynthetic efficiency and to determine their heritability.

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Photosynthetic Acclimation of Silene Dioica to Growth in Fluctuating Light

Cited by 34 publications

References 6 publications

Dynamic Acclimation of Photosynthesis Increases Plant Fitness in Changing Environments

Dynamic Acclimation of Photosynthesis Increases Plant Fitness in Changing Environments

Patterns of dynamic irradiance affect the photosynthetic capacity and growth of dipterocarp tree seedlings

Chlorophyll a + b Content and Chlorophyll Fluorescence in Avocado

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