Seasonal Acclimation of Stem Photosynthesis in Woody Legume Species from the Mojave and Sonoran Deserts of California

Nilsen, Erik T.

doi:10.1104/pp.105.4.1385

Cited by 34 publications

(46 citation statements)

References 15 publications

(33 reference statements)

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“…In these plants the uptake of atmospheric CO 2 reaches maximum rates of net stem photosynthesis of ca. 8-10 lmol CO 2 m -2 s -1 during the day (Nilsen and Sharifi 1994). In woody stems and branches with strongly lignified tissues and bark layers, net photosynthesis was observed almost exclusively with halved twig segments or isolated Fig.…”

Section: Resultsmentioning

confidence: 95%

Photosynthetic activity of stems in two Clusia species

Kocurek

Kornaś

Pilarski

et al. 2015

Trees

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Key message In stems of Clusia, CO 2 concentrated in the xylem sap in CAM trees can be fixed by PEPC and Rubisco, while in C 3 trees only Rubisco is engaged. Abstract The photosynthetic characteristics of 7-8-yearold stems of two tropical trees representing the Clusiaceae family were compared: Clusia multiflora Kunth. described as an obligate C 3 and Clusia rosea Jacq. as an obligate CAM plant. Photosynthetic gas exchange, xylem CO 2 concentration, chlorophyll distribution, 13 C discrimination, daily malate and citrate fluctuations and the abundance of Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) and PEPC (phosphoenolpyruvate carboxylase) proteins were measured in leaves and stems. In stems of both species a low CO 2 efflux (in the range of 0.05-0.1 lmol m -2 s -1 ) was observed as a result of extremely low cork conductance for water vapor (0.15-0.2 mmol m -2 s -1 ). This led to the CO 2 concentration in xylem sap reaching 5.2 (CO 2 *) mmol l -1 . The substantial amount of chlorophyll in the outer part of the bark and light-induced decrease of CO 2 concentration within the xylem can be explained by photosynthetic activity in this tissue. Moreover, Western blotting analyses proved the presence of Rubisco in the stems of both Clusia species; however, PEPC was only found in C. rosea. Additionally, daily fluctuations in the concentration of citrate and malate (higher than in leaves) and significant enrichment in 13 C in C. rosea stems were observed. These facts allow us to conclude that the examined stems of C. rosea and C. multiflora represent specific types of photosynthetic metabolism.

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Section: Resultsmentioning

confidence: 95%

Photosynthetic activity of stems in two Clusia species

Kocurek

Kornaś

Pilarski

et al. 2015

Trees

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“…However, it is believed that the photosynthetic rate of bark chlorenchymes cannot compensate fully for respiration losses of shoots and would not permit a positive CO 2 balance during the winter (Keller 1973;Foote and Schaedle 1976;Parker 1978;Pfanz et al 2002). It is also now well established that bark and stem photosynthesis exhibit seasonal variation with a strong decline during the winter (Foote and Schaedle 1976;Parker 1978;Nilsen and Sharifi 1994;Solhaug and Haugen 1998). These data nevertheless suggest an important role for stem and twig photosynthesis by woody perennials in maintaining a favorable carbon balance during the late autumn through to early spring months, when leaf photosynthesis is lost by deciduous trees and photosynthesis in high-light exposed winter needles (WN) is severely limited in over-wintering conifers (Ö quist and Huner 2003).…”

Section: Introductionmentioning

confidence: 96%

Characterization of the photosynthetic apparatus in cortical bark chlorenchyma of Scots pine

Ivanov

Król

Sveshnikov

et al. 2005

Planta

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Winter-induced inhibition of photosynthesis in Scots pine (Pinus sylvestris L.) needles is accompanied by a 65% reduction of the maximum photochemical efficiency of photosystem II (PSII), measured as Fv/Fm, but relatively stable photosystem I (PSI) activity. In contrast, the photochemical efficiency of PSII in bark chlorenchyma of Scots pine twigs was shown to be well preserved, while PSI capacity was severely decreased. Low-temperature (77 K) chlorophyll fluorescence measurements also revealed lower relative fluorescence intensity emitted from PSI in bark chlorenchyma compared to needles regardless of the growing season. Nondenaturating SDS-PAGE analysis of the chlorophyll-protein complexes also revealed much lower abundance of LHCI and the CPI band related to light harvesting and the core complex of PSI, respectively, in bark chlorenchyma. These changes were associated with a 38% reduction in the total amount of chlorophyll in the bark chlorenchyma relative to winter needles, but the Chl a/b ratio and carotenoid composition were similar in the two tissues. As distinct from winter pine needles exhibiting ATP/ADP ratio of 11.3, the total adenylate content in winter bark chlorenchyma was 2.5-fold higher and the estimated ATP/ADP ratio was 20.7. The photochemical efficiency of PSII in needles attached to the twig recovered significantly faster (28-30 h) then in detached needles. Fluorescence quenching analysis revealed a high reduction state of Q(A) and the PQ-pool in the green bark tissue. The role of bark chlorenchyma and its photochemical performance during the recovery of photosynthesis from winter stress in Scots pine is discussed.

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“…In the chloroplasts the grana stacks are higher and broader than those of the high-light adapted plants [12,13]. Besides of leaf photosynthesis, the contribution of the photosynthetic activity of stems -including even woody stems -is important [14,15]. The presence of chloroplasts was described in the cortex and in the pith regions of twigs [16].…”

Section: Introductionmentioning

confidence: 98%