Ontogenetic changes in the scaling of cellular respiration with respect to size among sunflower seedlings

Kutschera, U.; Niklas, Karl J.

doi:10.4161/psb.6.1.14001

Cited by 19 publications

(17 citation statements)

References 15 publications

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“…42 This interpretation is also consistent with the fact that tissue-level DNA content correlates almost one-to-one with respiration rate 43 (Fig. 7B).…”

Section: The Scaling Of Cellular Respirationsupporting

confidence: 75%

“…7.5-fold higher than after the emergence of the cotyledons from the seed coat, which was attributed to the hypoxic conditions of the enclosed embryo. 42 During late seedling development, R was found to scale roughly as R / M 3/7 , regardless of whether plants were grown in the dark or subsequently in white light. The numerical value of 3/7 is statistically significantly different from R / M 1.0 , which has been reported by some workers.…”

Section: The Scaling Of Cellular Respirationmentioning

confidence: 99%

“…As an example of how different tissues affect respiration rates, we turn to studies of sunflower (Helianthus annuus L.) seedlings [42][43][44] (Fig. 7A).…”

Section: The Scaling Of Cellular Respirationmentioning

confidence: 99%

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Kleiber's Law: How theFire of Lifeignited debate, fueled theory, and neglected plants as model organisms

Niklas¹,

Kutschera

2015

Plant Signaling & Behavior

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Size is a key feature of any organism since it influences the rate at which resources are consumed and thus affects metabolic rates. In the 1930s, size-dependent relationships were codified as "allometry" and it was shown that most of these could be quantified using the slopes of log-log plots of any 2 variables of interest. During the decades that followed, physiologists explored how animal respiration rates varied as a function of body size across taxa. The expectation was that rates would scale as the 2/3 power of body size as a reflection of the Euclidean relationship between surface area and volume. However, the work of Max Kleiber (1893Kleiber ( -1976 and others revealed that animal respiration rates apparently scale more closely as the 3/4 power of body size. This phenomenology, which is called "Kleiber's Law," has been described for a broad range of organisms, including some algae and plants. It has also been severely criticized on theoretical and empirical grounds. Here, we review the history of the analysis of metabolism, which originated with the works of Antoine L. Lavoisier (1743-1794) and Julius Sachs (1832-1897), and culminated in Kleiber's book The Fire of Life (1961; 2. ed. 1975). We then evaluate some of the criticisms that have been leveled against Kleiber's Law and some examples of the theories that have tried to explain it. We revive the speculation that intracellular exo-and endocytotic processes are resource delivery-systems, analogous to the supercellular systems in multicellular organisms. Finally, we present data that cast doubt on the existence of a single scaling relationship between growth and body size in plants.

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“…42 This interpretation is also consistent with the fact that tissue-level DNA content correlates almost one-to-one with respiration rate 43 (Fig. 7B).…”

Section: The Scaling Of Cellular Respirationsupporting

confidence: 75%

Section: The Scaling Of Cellular Respirationmentioning

confidence: 99%

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Kleiber's Law: How theFire of Lifeignited debate, fueled theory, and neglected plants as model organisms

Niklas¹,

Kutschera

2015

Plant Signaling & Behavior

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“…The variation in b values is even more extensive for intraspecific analyses. Only a few studies of intraspecific metabolic scaling have been carried out in plants, but they also document significant variation in b (Chen & Li, 2003;Peng et al, 2010;Kutschera & Niklas, 2011). For example, Glazier (2005) has shown that 50.2% of the b values for the 642 intraspecific metabolic scaling relationships that he surveyed are significantly different from 3/4, increasing to 72.7% for datasets with body-mass ranges spanning two or more orders of magnitude, and to 88.5% for datasets with body-mass ranges exceeding 2.5 orders of magnitude (Glazier, 2010).…”

Section: Metabolic Theory: Scaling the Fire Of Life (1) The Metamentioning

confidence: 99%

Is metabolic rate a universal ‘pacemaker’ for biological processes?

2014

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A common, long-held belief is that metabolic rate drives the rates of various biological, ecological and evolutionary processes. Although this metabolic pacemaker view (as assumed by the recent, influential 'metabolic theory of ecology') may be true in at least some situations (e.g. those involving moderate temperature effects or physiological processes closely linked to metabolism, such as heartbeat and breathing rate), it suffers from several major limitations, including: (i) it is supported chiefly by indirect, correlational evidence (e.g. similarities between the body-size and temperature scaling of metabolic rate and that of other biological processes, which are not always observed) - direct, mechanistic or experimental support is scarce and much needed; (ii) it is contradicted by abundant evidence showing that various intrinsic and extrinsic factors (e.g. hormonal action and temperature changes) can dissociate the rates of metabolism, growth, development and other biological processes; (iii) there are many examples where metabolic rate appears to respond to, rather than drive the rates of various other biological processes (e.g. ontogenetic growth, food intake and locomotor activity); (iv) there are additional examples where metabolic rate appears to be unrelated to the rate of a biological process (e.g. ageing, circadian rhythms, and molecular evolution); and (v) the theoretical foundation for the metabolic pacemaker view focuses only on the energetic control of biological processes, while ignoring the importance of informational control, as mediated by various genetic, cellular, and neuroendocrine regulatory systems. I argue that a comprehensive understanding of the pace of life must include how biological activities depend on both energy and information and their environmentally sensitive interaction. This conclusion is supported by extensive evidence showing that hormones and other regulatory factors and signalling systems coordinate the processes of growth, metabolism and food intake in adaptive ways that are responsive to an organism's internal and external conditions. Metabolic rate does not merely dictate growth rate, but is coadjusted with it. Energy and information use are intimately intertwined in living systems: biological signalling pathways both control and respond to the energetic state of an organism. This review also reveals that we have much to learn about the temporal structure of the pace of life. Are its component processes highly integrated and synchronized, or are they loosely connected and often discordant? And what causes the level of coordination that we see? These questions are of great theoretical and practical importance.

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“…However, metabolic scaling often shows marked shifts during ontogeny in animals and plants (b R varying mostly between 2/3 and 1, but also showing values outside this range) [3][4][5][6][7] that are not well understood. These metabolic shifts are important because they appear to be fundamentally linked to other ontogenetic changes in the physiology, growth rate, cell size, body composition, behaviour and ecology of a species [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Shape shifting predicts ontogenetic changes in metabolic scaling in diverse aquatic invertebrates

2015

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Metabolism fuels all biological activities, and thus understanding its variation is fundamentally important. Much of this variation is related to body size, which is commonly believed to follow a 3/4-power scaling law. However, during ontogeny, many kinds of animals and plants show marked shifts in metabolic scaling that deviate from 3/4-power scaling predicted by general models. Here, we show that in diverse aquatic invertebrates, ontogenetic shifts in the scaling of routine metabolic rate from near isometry (b R ¼ scaling exponent approx. 1) to negative allometry (b R , 1), or the reverse, are associated with significant changes in body shape (indexed by b L ¼ the scaling exponent of the relationship between body mass and body length). The observed inverse correlations between b R and b L are predicted by metabolic scaling theory that emphasizes resource/waste fluxes across external body surfaces, but contradict theory that emphasizes resource transport through internal networks. Geometric estimates of the scaling of surface area (SA) with body mass (b A ) further show that ontogenetic shifts in b R and b A are positively correlated. These results support new metabolic scaling theory based on SA influences that may be applied to ontogenetic shifts in b R shown by many kinds of animals and plants.

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Ontogenetic changes in the scaling of cellular respiration with respect to size among sunflower seedlings

Cited by 19 publications

References 15 publications

Kleiber's Law: How theFire of Lifeignited debate, fueled theory, and neglected plants as model organisms

Kleiber's Law: How theFire of Lifeignited debate, fueled theory, and neglected plants as model organisms

Is metabolic rate a universal ‘pacemaker’ for biological processes?

Shape shifting predicts ontogenetic changes in metabolic scaling in diverse aquatic invertebrates

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