Non‐uniform stomatal closure and the apparent convexity of the photosynthetic photon flux density response curve

Olsson, Therese; Leverenz, Jerry W.

doi:10.1111/j.1365-3040.1994.tb00162.x

Cited by 49 publications

(31 citation statements)

References 25 publications

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“…Dark respiration (R) was measured after each curve. Maximum carboxylation (Vc max ), estimates of the maximum rate of ribulose 1,5 bisphosphate regeneration (J max ), triose phosphate utilization (TPU), and CO 2 compensation point (Γ) were calculated from the biochemical model of Farquhar et al [9], following the subsequent modifications of Sharkey [30], Harley and Sharkey [13], and Harley et al [14]. Abbreviations after the species represent glasshouse (gl), and field (fd) conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The model estimated the maximum rate of carboxylation (Vc max ), the maximum rate of ribulose 1,5-bisphosphate regeneration (assumed to equal the maximum rate of coupled photosynthetic electron transport) (J max ), and the CO 2 compensation point by the biochemical model of Farquhar et al [12], following the subsequent modifications of Sharkey [36], Harley and Sharkey [17], and Harley et al [18]. Carboxylation efficiency (CE) was estimated by least-squares regression [30]. Nonlinear regression techniques for estimating Vc max , J max , and triose phosphate utilization (TPU) followed Wullschleger [40].…”

Section: Leaf Gas Exchangementioning

confidence: 99%

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An analysis of ecophysiological responses to drought in American Chestnut

et al. 2006

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-With the anticipated reintroduction of blight resistant American chestnut (Castanea dentata [Marsh.] Borkh.), it is important to understand physiological responses of the species to various environmental stresses. To test the hypothesis that instantaneous water use efficiency (WUE i ) of American chestnut seedlings is increased by water stress, we measured gas exchange, leaf optical properties, and growth of American chestnut seedlings under well-watered and drought in both glasshouse and field conditions. Under well-watered conditions, field grown seedlings had consistently higher net photosynthesis (A net ) and leaf stomatal conductance (g s ) values than glasshouse seedlings. Under drought conditions, both field and glasshouse grown seedlings responded with a general increase in WUE i . Compared to well-watered conditions, drought stress significantly reduced the amount of light absorption regardless of growth environment. Under well-watered conditions, both field and glasshouse grown seedlings had similar maximum net photosynthesis rate (A max ) and maximum rate of ribulose 1,5 bisphosphate regeneration (J max ); however, maximum carboxylation (Vc max ), CO 2 compensation point (Γ), carboxylation efficiency (CE), and dark respiration (R) were substantially higher in the field grown seedlings. When WUE i values are compared to those of prevailing deciduous hardwood species that now inhabit American chestnuts once native range, we conclude that American chestnut has an advantageous preadaptation to water stress that might be a key survival determinant when it is reintroduced. leaf conductance / net photosynthesis / water-use efficiency Résumé -Analyse des réponses écophysiologiques à la sécheresse du châtaignier américain. Pour anticiper la réintroduction du châtaignier améri-cain (Castanea dentata [Marsh.] Borkh.) résistant à la rouille, il est important de comprendre les réponses physiologiques de cette espèce aux différents stress environnementaux. Pour tester l'hypothèse que l'efficience instantanée de l'eau (WUE i ) des semis de châtaignier américain est augmentée par le stress hydrique, nous avons mesuré les échanges gazeux, les propriétés optiques des feuilles et la croissance de semis bien alimentés en eau et de semis soumis à une sécheresse élevés en serre et en conditions extérieures. Dans le cas d'une bonne alimentation en eau, les semis poussant à l'extérieur ont eu constamment des valeurs plus élevées de photosynthèse nette (A net ) et de conductance foliaire (g s ) que celles des semis élevés en serre. Dans le cas de semis soumis à la sécheresse, les semis élevés en serre et ceux élevés en extérieur répondent par un accroissement général de WUE i . Comparativement aux conditions de bonne alimentation hydrique, la sécheresse réduit significativement la quantité de lumière absorbée indépendamment des conditions environnementales. En condition de bonne alimentation hydrique, les semis élevés en serre et en extérieur ont un taux maximum de photosynthèse nette (A max ) et un taux maximum de ...

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Section: Discussionmentioning

confidence: 99%

Section: Leaf Gas Exchangementioning

confidence: 99%

An analysis of ecophysiological responses to drought in American Chestnut

et al. 2006

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“…50 mol mol ¡1 and increased stepwise to 1,000 mol mol ¡1 in 12 steps (50,100,150,200, 300, 400, 500, 600, 700, 800, 900 and 1,000 mol mol ¡1 ). Net photosynthesis versus C i curves over the range of 0-150 mol mol ¡1 was determined, and the regressions of CO 2 and P n were used to determine the CO 2 compensation point ( ) and carboxylation eYciency (CE; Olsson and Leverenz 1994).…”

Section: ¡1mentioning

confidence: 99%

Nitrogen deposition limits photosynthetic response to elevated CO2 differentially in a dioecious species

Zhao

Zhang

et al. 2010

Oecologia

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Sexual dimorphisms of dioecious plants are important in controlling and maintaining sex ratios under changing climate environments. Yet, little is known about sex-speciWc responses to elevated CO 2 with soil nitrogen (N) deposition. To investigate sex-related physiological and biochemical responses to elevated CO 2 with N deposition, Populus cathayana Rehd. was employed as a model species. The cuttings were subjected to two CO 2 regimes (350 and 700 mol mol ¡1) with two N levels (0 and 5 g N m ¡2 year ¡1). Our results showed that elevated CO 2 and N deposition separately increased the total number of leaves, leaf area (LA), leaf mass, net photosynthetic rate (P n ), light saturated photosynthetic rate (P max ), chlorophyll a (Chl a), and chlorophyll a to chlorophyll b ratio (Chl a/b) in both males and females of P. cathayana. However, the eVects on LA, leaf mass, P n , P max , Chl a and Chl a/b were weakened under the combined treatment of elevated CO 2 and N deposition. Males had higher leaf mass, P n , P max , apparent quantum yield ( ), carboxylation eYciency (CE), Chl a, Chl a/b, leaf N, and root carbon to N ratio (C/N) than did females under elevated CO 2 with N deposition. In contrast to males, females had signiWcantly higher levels of soluble sugars in leaves and greater starch accumulation in roots and stems under the same condition. The results of the present work imply that P. cathayana females are more responsive and suVer from greater negative eVects on growth and photosynthetic capacity than do males when grown under elevated CO 2 with soil N deposition.

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“…The regressions of P n versus C i curves (range from 0 to 200 lmol mol À1 ) were used to determine the CO 2 compensation point (CP) and carboxylation efficiency (CE) as described by Olsson and Leverenz (1994). The photosynthesis curve plotted against C i (P n /C i curve) was analyzed to estimate the maximum rate of RuBP carboxylation (V cmax ) and the maximum rate of electron transport driving regeneration of RuBP (J max ) as described by Long and Bernacchi (2003).…”

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confidence: 99%