Light and carbon dioxide in stomatal movements

Heath, O. V. S.

doi:10.1007/978-3-642-94755-1_19

Cited by 10 publications

(7 citation statements)

References 74 publications

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“…However, the absence of a positive correlation between gas phase resistance and substomatal CO2 concentration (Fig. 5) does not support this explanation if we accept the widely held view that stomatal aperture is inversely related to substomata1 cavity CO 2 concentration (Heath 1959;Meidner and Mansfield 1968). Alternatively, the primary variable may be stomatal resistance, residual resistance being linked to it by some unknown mechanism.…”

Section: Discussionmentioning

confidence: 73%

Photosynthetic Characteristics of Modern and Primitive Wheat Species in Relation to Ontogeny and Adaptation to Light

Dunstone¹,

Gifford²,

Evans³

1973

Aust. Jnl. Of Bio. Sci.

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Some characteristics of photosynthesis in seven species of Triticum and two of Aegilops were examined. Differences between species in the rate of net photosynthesis per unit area were more pronounced in later formed leaves than in earlier ones, flag leaves showing the greatest range of photosynthesis rates. The range in flag leaf net photosynthetic rates was greatest for plants grown under high light intensity. Net photosynthetic rates of flag leaves of diploid species of Triticum, measured under high light intensity, increased progressively with increase in light intensity during growth, whereas the rates for the Aegilops species and the tetrapbid and hexaploid lines of Triticum reached their maxima at intermediate light intensity during growth.Under one set of environmental conditions during growth, a diffusion resistance study of flag leaf photosynthesis revealed that both the gas phase resistance and "residual" ("mesophyll" or "intracellular") resistance contribute to the observed differences in photosynthetic rate. When the average values of resiJual resistance for each genotype were plotted against the corresponding gas phase resistance a positive correlation, to which all but three of the lines adhered, was found, an increase of 0·5 s cm-1 in gas phase resistance being associated with an increase of I . 0 s cm-1 in residual resistance.When adaptaticJn to cifferent light intensities occurred over a prolonged period, the stomatal density on the flag leaf of two diploid lines and of a hexapbid (T. spelta) line adapted upwards to high light but did not do so for T. aestivum. However, the adaptation was small and of minor significance to the overall photosynthetic adaptation. Variation in stomatal density was not a major determinant of variation in stomatal resistance.Specific leaf weight bore no consistent relation with either photosynthetic rate or residual resistance.

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Section: Discussionmentioning

confidence: 73%

Photosynthetic Characteristics of Modern and Primitive Wheat Species in Relation to Ontogeny and Adaptation to Light

Dunstone¹,

Gifford²,

Evans³

1973

Aust. Jnl. Of Bio. Sci.

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“…, 2001). The dark‐induced increase in CO 2 subsequently triggers stomatal closure in the wild‐type (Heath, 1959; Roelfsema et al. , 2002; Stahl, 1920), but not in the stomata of Nt MPK4‐repressed plants.…”

Section: Discussionmentioning

confidence: 99%

Silencing of NtMPK4 impairs CO₂‐induced stomatal closure, activation of anion channels and cytosolic Ca²⁺signals in Nicotiana tabacum guard cells

et al. 2008

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SummaryLight-induced stomatal opening in C3 and C4 plants is mediated by two signalling pathways. One pathway is specific for blue light and involves phototropins, while the second pathway depends on photosyntheticaly active radiation (PAR). Here, the role of NtMPK4 in light-induced stomatal opening was studied, as silencing of this MAP kinase stimulates stomatal opening. Stomata of NtMPK4-silenced plants do not close in elevated atmospheric CO 2 , and show a reduced response to PAR. However, stomatal closure can still be induced by abscisic acid. Measurements using multi-barrelled intracellular micro-electrodes showed that CO 2 activates plasma membrane anion channels in wild-type Nicotiana tabacum guard cells, but not in NtMPK4-silenced cells. Anion channels were also activated in wild-type guard cells after switching off PAR. In approximately half of these cells, activation of anion channels was accompanied by an increase in the cytosolic free Ca 2+ concentration. The activity of anion channels was higher in cells showing a parallel increase in cytosolic Ca 2+ than in those with steady Ca 2+ levels. Both the darkness-induced anion channel activation and Ca 2+ signals were repressed in NtMPK4-silenced guard cells. These data show that CO 2 and darkness can activate anion channels in a Ca 2+ -independent manner, but the anion channel activity is enhanced by parallel increases in the cytosolic Ca 2+ concentration. NtMPK4 plays an essential role in CO 2 -and darkness-induced activation of guardcell anion channels, through Ca 2+ -independent as well as Ca 2+ -dependent signalling pathways.

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“…Fujino 1967;Sawhney and Zelitch 1969;Fischer 1971;Humble and Raschke 1971;Allaway 1973; see also reviews by Heath 1959;Meidner and Mansfield 1965;Milthorpe 1969). …”

Section: Introductionmentioning

confidence: 99%

Daily Changes in Stomatal Aperture and in Carbohydrates and Malate Within Epidermis and Mesophyll of leaves of Commelina Cyanea and Vicia Faba

Pearson¹

1973

Aust. Jnl. Of Bio. Sci.

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Stomatal apertures and methanol-, water-, and hydrochloric acid-soluble carbohydrates and malate were measured in the epidermis, mesophyll, and midvein of leaves of C. cyanea R. Br. and V. [aba L. over a period of 26 hr in one experiment and over 9 hr during the photoperiod in a second experiment.Metabolite concentrations were the same in mesophyll and vein and followed typical diurnal patterns of accumulation and depletion. Concentrations in the epidermis showed little association with those in the mesophyll. The accumulation during the morning of epidermal sugars plus malate, at rates equivalent to 1·4 and 3 . 6 p.g mg-1 hr-1 in C. cyanea and V. [aba, was accompanied by a fall in polysaccharides with no net change in total metabolites, whereas rises in mesophyll sugars and malate of 3·6 and 6'9 p.g mg-1 hr-1 were associated with increases in polysaccharides.Associations were found between aperture and the concentration of epidermal malate.The differences between minimum and maximum epidermal malate concentrations (about 2· 6 and 6·1 p.g mg-1 in C. cyanea and V. [aba) were sufficient to balance the potassium changes found by other authors to occur during stomatal opening in Vicia.

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Light and carbon dioxide in stomatal movements

Cited by 10 publications

References 74 publications

Photosynthetic Characteristics of Modern and Primitive Wheat Species in Relation to Ontogeny and Adaptation to Light

Photosynthetic Characteristics of Modern and Primitive Wheat Species in Relation to Ontogeny and Adaptation to Light

Silencing of NtMPK4 impairs CO₂‐induced stomatal closure, activation of anion channels and cytosolic Ca²⁺signals in Nicotiana tabacum guard cells

Daily Changes in Stomatal Aperture and in Carbohydrates and Malate Within Epidermis and Mesophyll of leaves of Commelina Cyanea and Vicia Faba

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Light and carbon dioxide in stomatal movements

Cited by 10 publications

References 74 publications

Photosynthetic Characteristics of Modern and Primitive Wheat Species in Relation to Ontogeny and Adaptation to Light

Photosynthetic Characteristics of Modern and Primitive Wheat Species in Relation to Ontogeny and Adaptation to Light

Silencing of NtMPK4 impairs CO2‐induced stomatal closure, activation of anion channels and cytosolic Ca2+signals in Nicotiana tabacum guard cells

Daily Changes in Stomatal Aperture and in Carbohydrates and Malate Within Epidermis and Mesophyll of leaves of Commelina Cyanea and Vicia Faba

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Silencing of NtMPK4 impairs CO₂‐induced stomatal closure, activation of anion channels and cytosolic Ca²⁺signals in Nicotiana tabacum guard cells