The effect of photoperiod length on respiration in leaves of <i>Saxifraga cernua</i> L., an arctic herb

McNulty, Amy K.; Cummins, W. Raymond

doi:10.1111/j.1365-3040.1989.tb01634.x

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Should plants migrate to higher latitudes in response to climatic warming (Davis et al, 1986), then respiration rates may increase in response to changes in day length (McNulty & Cummins, 1989). In contrast, the respiration rate may acclimate to any changes in temperature so that the operating respiration rate remains unchanged, even if temperatures increase or decrease (Billings et al, 1971;McNulty & Cummins, 1987;Korner & Larcher, 1988).…”

Section: Predictions For Future Climatesmentioning

confidence: 99%

Predicting plant responses to global environmental change

Woodward

1992

New Phytologist

107

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SUMMARY Predicting the future responses of plants and ecosystems to further changes in the CO2 concentration of the atmosphere and to the possibility of global warming are important current concerns. Predictions have been most frequently attempted using short‐term, single‐factor experiments in controlled environments. However, these experiments have failed to indicate the outcome of field experiments at larger spatial and temporal scales. Some of this failure is due to ignorance of environmental conditions and interactions while some is due to the use of inappropriate short‐cuts, such as the addition of fertilizers for simulating enhanced mineralization, and some is due to ignorance of the processes involved in scaling‐up from individual plants to populations. Long‐term observations on plants in ecosystems nevertheless indicate that community‐scale experiments may provide a useful but imperfect capacity to predict ecosystem responses. Although difficult to implement in practice, it is concluded that catchment‐scale experiments offer the best opportunity to predict plant, community and ecosystem responses to environmental change.

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Section: Predictions For Future Climatesmentioning

confidence: 99%

Predicting plant responses to global environmental change

Woodward

1992

New Phytologist

107

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“…Saxifraga cernua plants were grown from asexual bulblets at 20°C under constant illumination (300 [lmol m^^s"') supplied by 26 fluorescent (General Electric coolwhite) and 46 incandescent (General Electric 1-Line) bulbs as described previously (Collier and Cummins 1991). Growth of S. cernua under constant illumination closely mimics the duration of illumination in its natural environment and eliminates any potentially confounding diurnal respiratory rhythms (McNulty and Cummins 1989). Plants were watered every 3 days and fertilized (N;P;K 20:20:20) every 9 days for 7 weeks tantil the star!…”

Section: Plant Materials and Treatraenismentioning

confidence: 99%

The rate of development of water deficits affects Saxifraga cernua leaf respiration

Collier¹,

Cummins²

1996

Physiol Plant

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W. R. 1996. The rate of development of water deficits affects Saxifraga cernua leaf respiration. -Physiol. Plant. 96: 291-297.We allowed plant water deficits to develop at two different rates following the cessation of watering in order to investigate the effects of water stress on cytochrome pathway and alternative pathway respiration in the leaves of the arctic herb Saxifraga cernua. Plants were pretreated by growth in either a commercial organic (CO) mixture or a vermiculite-perlite (VP) mixture, which allowed the complete development of water deficits in 19 and 8 days, respectively. The rate of water potential reduction was approximately 0.11 MPa day"' in the leaves of CO plants, compai-ed to a reduction of 0,21 MPa day"' in leaves of VP plants. Osmotic adjustment occurred to a greater extent in leaves of CO plants and corresponded with an increase in ethanol-soluble sugars. In leaves of CO plants, cytochrome pathway activity gradually declined from that of control rates until day 11, and then declined more rapidly. In contrast, cytochrome pathway activity significantly increased in response to water deficits in leaves of VP plants. In leaves of both CO and VP plants, alternative pathway activity declined as water stress progressed. Relatively severe water deficits reduced alternative pathway capacity in leaves of botii CO and VP plants. We also investigated the effect of previous exposure to water deficits on leaf respiration. In piants that had previously experienced three cycles of water stress, the increase in cytoehrome pathway activity during the fourth water stress cycle was small compared to the increase obseri'ed in leaves of plants experiencing water stress for the first time. These results suggest that cytochrome pathway activity is differentially sensitive to the rate of development of plant water deficits and that respiratory responses to acute water stress are not necessarily similar to the responses to chronic water stress,

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The rate of development of water deficits affects Saxifraga cernua leaf respiration

Collier

Cummins

1996

Physiologia Plantarum

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We allowed plant water deficits to develop at two different rates following the cessation of watering in order to investigate the effects of water stress on cytochrome pathway and alternative pathway respiration in the leaves of the arctic herb Saxifraga cernua. Plants were pretreated by growth in either a commercial organic (CO) mixture or a vermiculite‐perlite (VP) mixture, which allowed the complete development of water deficits in 19 and 8 days, respectively. The rate of water potential reduction was approximately 0.11 MPa day−1 in the leaves of CO plants, compared to a reduction of 0.21 MPa day−1 in leaves of VP plants. Osmotic adjustment occurred to a greater extent in leaves of CO plants and corresponded with an increase in ethanol‐soluble sugars. In leaves of CO plants, cytochrome pathway activity gradually declined from that of control rates until day 11, and then declined more rapidly. In contrast, cytochrome pathway activity significantly increased in response to water deficits in leaves of VP plants. In leaves of both CO and VP plants, alternative pathway activity declined as water stress progressed. Relatively severe water deficits reduced alternative pathway capacity in leaves of both CO and VP plants. We also investigated the effect of previous exposure to water deficits on leaf respiration. In plants that had previously experienced three cycles of water stress, the increase in cytochrome pathway activity during the fourth water stress cycle was small compared to the increase observed in leaves of plants experiencing water stress for the first time. These results suggest that cytochrome pathway activity is differentially sensitive to the rate of development of plant water deficits and that respiratory responses to acute water stress are not necessarily similar to the responses to chronic water stress.

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The effect of photoperiod length on respiration in leaves of Saxifraga cernua L., an arctic herb

Cited by 4 publications

References 19 publications

Predicting plant responses to global environmental change

Predicting plant responses to global environmental change

The rate of development of water deficits affects Saxifraga cernua leaf respiration

The rate of development of water deficits affects Saxifraga cernua leaf respiration

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