Short-term effects of light quality on leaf gas exchange and hydraulic properties of silver birch (Betula pendula)

Niglas, Aigar; Papp, Kaisa; Sękiewicz, Maciej; Sellin, Arne

doi:10.1093/treephys/tpx087

Cited by 8 publications

(5 citation statements)

References 65 publications

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“…Under environmental stresses, the photosynthetic ability is usually affected by stomatal behavior in higher plants. Many studies indicated that abiotic stresses resulted in a decline in P n , T r , and G s , and an increase in C i [ 31 , 32 , 33 ]. Here, highland barley showed high P n , T r , G s , and C i relative to the other three plants, indicating that gas exchange was more effective in highland barley under high light exposure.…”

Section: Discussionmentioning

confidence: 99%

Different Photosynthetic Response to High Light in Four Triticeae Crops

Chen

Mao

Lin

et al. 2023

IJMS

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Photosynthetic capacity is usually affected by light intensity in the field. In this study, photosynthetic characteristics of four different Triticeae crops (wheat, triticale, barley, and highland barley) were investigated based on chlorophyll fluorescence and the level of photosynthetic proteins under high light. Compared with wheat, three cereals (triticale, barley, and highland barley) presented higher photochemical efficiency and heat dissipation under normal light and high light for 3 h, especially highland barley. In contrast, lower photoinhibition was observed in barley and highland barley relative to wheat and triticale. In addition, barley and highland barley showed a lower decline in D1 and higher increase in Lhcb6 than wheat and triticale under high light. Furthermore, compared with the control, the results obtained from PSII protein phosphorylation showed that the phosphorylation level of PSII reaction center proteins (D1 and D2) was higher in barley and highland barley than that of wheat and triticale. Therefore, we speculated that highland barley can effectively alleviate photodamages to photosynthetic apparatus by high photoprotective dissipation, strong phosphorylation of PSII reaction center proteins, and rapid PSII repair cycle under high light.

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Section: Discussionmentioning

confidence: 99%

Different Photosynthetic Response to High Light in Four Triticeae Crops

Chen

Mao

Lin

et al. 2023

IJMS

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“…It is thus possible that the higher relative presence of BL in the morning is responsible for the rapid K leaf , enhancement during the transition from dark to light (Voicu et al ., 2008; Ben Baaziz et al ., 2012; Grunwald et al ., 2022). Additionally, during daytime, BL was found to induce a greater increase in K leaf in shaded leaves (normally exposed to little or no BL), as compared with leaves directly irradiated by the sun (Niglas et al ., 2017). This may be an adaptation for efficient hydraulic adjustment to compliment the increased stomatal and photosynthetic activity stimulated by the fast‐changing patterns of sunflecks, which increases the BL proportions shaded leaves momentarily receive (Niglas et al ., 2017).…”

Section: How Light Quality Affects Kleafmentioning

confidence: 99%

“…Additionally, during daytime, BL was found to induce a greater increase in K leaf in shaded leaves (normally exposed to little or no BL), as compared with leaves directly irradiated by the sun (Niglas et al ., 2017). This may be an adaptation for efficient hydraulic adjustment to compliment the increased stomatal and photosynthetic activity stimulated by the fast‐changing patterns of sunflecks, which increases the BL proportions shaded leaves momentarily receive (Niglas et al ., 2017). Since xylem conduits consist of dead tissue, the rapid and dynamic response of K leaf to light quality and intensity, which occurs within minutes, necessitates the involvement of physiological regulatory mechanisms.…”

Section: How Light Quality Affects Kleafmentioning

confidence: 99%

“…Although thier K leaf can respond quickly and opportunistically to short‐term illumination such as sunflecks, the response to similar conditions will be of lower magnitude than of in a leaf which developed under saturating light. Shaded leaves naturally display lower transpiration rates, g s , K leaf and photosynthesis ( A N ) than leaves that are exposed to direct sunlight (Voicu et al ., 2008; Scoffoni et al ., 2015; Niglas et al ., 2017). However, this reduction in physiological parameters for sun‐exposed vs shaded leaves is not linear, as the reductions in K leaf and g s are greater than the reduction of A N , resulting in higher A N : g s and A N : K leaf ratios, which translate into greater water‐use efficiency (WUE) in the shade (Fig.…”

Section: What Is the Biological Significance And Evolutionary Advanta...mentioning

confidence: 99%

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Illuminating plant water dynamics: the role of light in leaf hydraulic regulation

Grunwald,

Yaaran,

Moshelion

2023

New Phytologist

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SummaryLight intensity and quality influence photosynthesis directly but also have an indirect effect by increasing stomatal apertures and enhancing gas exchange. Consequently, in areas such as the upper canopy, a high water demand for transpiration and temperature regulation is created. This paper explores how light intensity and the natural high Blue‐Light (BL) : Red‐Light (RL) ratio in these areas, is important for controlling leaf hydraulic conductance (Kleaf) by BL signal transduction, increasing water permeability in cells surrounding the vascular tissue, in supporting the enormous water demands. Conversely, shaded inner‐canopy areas receive less radiation, have lower water and cooling demands, and exhibit reduced Kleaf due to diminished intensity and BL induction. Intriguingly, shaded leaves display higher water‐use efficiency (compared with upper‐canopy) due to decreased transpiration and cooling requirements while the presence of RL supports photosynthesis.

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“…To maximize their morphological growth and physiological processes, plants must be able to sense and respond to changes in light properties, which vary spatially and temporally in natural conditions, especially within forest canopies. There is a marked decrease in light intensity from the upper to the lower canopy, with upper-canopy foliage exposed to higher irradiance than lower-canopy foliage shaded by leaves and branches residing in the upper canopy [24][25][26][27][28]. There is a need to clarify how iWUE varies with light intensity.…”

Section: Introductionmentioning

confidence: 99%

Physiological and Morphological Variation in Balsam Fir Provenances Growing in New Brunswick, Canada

Akalusi

Bourque

2021

Forests

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There is a need to understand the physio-morphological responses of northern tree species to climate change. The hypothesis of the current study was that provenance and light intensity were both influential in the control of intrinsic water-use efficiency (iWUE). Diameter at breast height (DBH)-increment was hypothesized as being more affected by provenance. Intrinsic water-use efficiency (iWUE), the ratio of photosynthesis (A) to stomatal conductance (gs), was assessed in foliage under two levels of photosynthetically active radiation (PAR; i.e., 300 and 1200 μmol m−2 s−1) in 63-year-old balsam fir [Abies balsamea (L.) Mill.] provenances derived from seed sources from across the species’ natural range (namely, within 44°–51° N latitudes and 53°–102° W longitudes) and cultivated in a common garden in eastern Canada. Diameter at breast height (DBH) of provenances from the common garden were measured when they were 42 and 58 years old (DBH1998, DBH2014). The results confirmed the hypotheses regarding the roles of provenance on iWUE and DBH (p < 0.05), but showed a diminished role of PAR on iWUE. The lowest and highest mean iWUE and DBH among the provenances ranged between 0.028 and 0.031 and 0.079–0.083 μmol mmol−1 and 11.82–12.78 and 16.38–18.44 cm, respectively. Stomatal conductance of balsam fir had a strong relationship with iWUE at both light settings, whereas A had a weaker relationship with iWUE. There were no significant relationships between iWUE at the two light settings and climatic variables at the provenance source (p > 0.05). Diameter at breast height in 2014 was significantly greater than DBH1998 (p < 0.05). The relationships between DBH2014 and climatic variables at the provenance source were statistically significant (p < 0.05). There was a significant positive relationship between iWUE and DBH measured in 2014. Survivorship of provenances was shown to vary with DBH-increment. The results show that for present-day and future forest management, (i) selection in balsam fir, in relation to iWUE should ideally be based on a criterion of intraspecific stomatal conductance; (ii) shade tolerance of balsam fir, population differentiation, and consistent pace of DBH-growth under variable climatic conditions are important factors in the species’ sustained growth under changes in forest dynamics projected to accompany changes in regional climate; (iii) temperature variables are strong indicators of DBH-increment in balsam fir; (iv) the effect of tree size on its survival is maintained under variable climatic conditions; and (v) there is a clear association between iWUE and the species’ radial growth.

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Short-term effects of light quality on leaf gas exchange and hydraulic properties of silver birch (Betula pendula)

Cited by 8 publications

References 65 publications

Different Photosynthetic Response to High Light in Four Triticeae Crops

Different Photosynthetic Response to High Light in Four Triticeae Crops

Illuminating plant water dynamics: the role of light in leaf hydraulic regulation

Physiological and Morphological Variation in Balsam Fir Provenances Growing in New Brunswick, Canada

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