A Theoretical Basis of Growth and Maintenance Respiration

Barnes, Anthony; Hole, C. C.

doi:10.1093/oxfordjournals.aob.a085563

Cited by 45 publications

(15 citation statements)

References 6 publications

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“…The value of KG in shoots is lower than that estimated by Barnes & Hole (1978), and their KD value was higher for uniculm barley. The present model has no compartments of non-degradable materials, as suggested by Thornley (1977).…”

Section: (1979)contrasting

confidence: 62%

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A Model of Assimilate Partitioning and Utilization in Shoots and Roots in the Vegetative Stage ofLolium multiflorum

Hansen¹,

Svendsen²

1986

Acta Agriculturae Scandinavica

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A model of assimilate partitioning and utilization in shoots and roots in the vegetative stage of Loliiini multijloriirn. Received Nov. 15, 1985. Acta Agric Scand 36: 286300, 1986 With the purpose of improving crop growth simulation, a mechanistic model and its parameters for assimilate partitioning and utilization were developed for vegetative Loliiitn miiltijlorum Lam. (cv. Lomi). The model is based on first-order kinetics and on previously determined efficiencies of assimilate utilization. The driving variable is gross photospnthesis. The five state variables are the translocation pool of recently assimilated carbon, and for shoots and roofs, the storage pools and the pools of structural material, respectively. The model consists of first-order rate equations with six parameters. These parameters were estimated by analysis of the time course of C02-exchange rates, separately for shoots and roots, respectively, during prolonged dark periods of two days and prolonged photoperiods of two days. The analysis Has based on maintenance coeficients and on utilization efficiences of shoots and roots and on simulation. Due to the differences in carbon utilization between shoots and roots it w a s concluded that environmental factors influencing the respiration will cause changes in the shoot: root relation. Thus predicted data showed that the functional relation: "shoot weight x shoot activity = root weight x root activity'' may be explained by the differences between shoot and root respiration.

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Section: (1979)contrasting

confidence: 62%

“…A part of the structural material is degradable and recycled through the pool of storage material. Barnes & Hole (1978) showed that Thornley's (1977) model did not conflict with the general assumptions that respiration can be divided functionally into tivo components, growth and maintenance. There were, ho\vever.…”

Section: Introductionmentioning

confidence: 99%

A Model of Assimilate Partitioning and Utilization in Shoots and Roots in the Vegetative Stage ofLolium multiflorum

Hansen¹,

Svendsen²

1986

Acta Agriculturae Scandinavica

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“…Figures of 10 h for the half time of "*C remaining in whole barley plants, and of 3-4 h for the '''C in the soluble pool of barley, can be inferred from published data (Farrar, 1980b; in each case reference is to the first phase of a two-phase efflux) and support the rapid turnover of soluble material this analysis indicates. A similar half-time of 8.8 h for a soluble pool comes from data on "•C efflux from barley analyzed by Barnes & Hole (1978). A large proportion of the soluble carbohydrate in the young barley plants is in the leaves (Farrar, 1981;Gordon et al, 1977) and it can be shown to have a half-time of about 0.5 h (Owera, Farrar & Whitbread, unpublished); that this half time is small compared with that from whole plants is presumably due to its describing export, not metabolism, of soluble sugar.…”

Section: Discussionmentioning

confidence: 86%

A compartmental model of carbon allocation in the vegetative barley plant

Prosser

Farrar

1981

Plant Cell & Environment

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The allocation of carbon in a vegetative barley plant is described as an open, three-compartment model; the three compartments are soluble (which exchanges material with the environment), storage, and structure (both of which exchange material with the soluble comparttnent). The model shows a good fit with data on '''C kinetics following '''CO2 feeding and some of its assumptions, properties and implications are discussed.

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“…The TNC measured for control plants had dd'). (16,18,25), or that maintenance respiration is entirely independent of growth (1,15,24) have been examined in more detail elsewhere. We found these simplifying assumptions sufficient to predict the relationship between TNC, Rd, and rgr under diurnally fluctuating temperature conditions.…”

Section: Methodsmentioning

confidence: 99%

Temperature Dependence of Vegetative Growth and Dark Respiration: A Mathematical Model

Gent

Enoch²

1983

Plant Physiol.

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A mathematical model of the processes involved in carbon metabolism is described that predicts the influence of temperature on the growth of plants. The model assumes that the rate of production of dry matter depends both on the temperature and the level of nonstructural carbohydrate. The level of nonstructural carbohydrate is determined by the rates of photosynthesis, growth, and maintenance respiration. The model describes the rate of growth and dark respiration, and the levels of carbohydrate seen in vegetative growth of carnation and tomato. The model suggests that the growth of plants at low temperatures is limited by a shortage of respiratory energy, whereas at high temperatures growth is limited by the shortage ofcarbohydrate. Thermoperiodism, wherein a warm day and cool night results in faster growth than does constant temperature, is explained by the model as an increase in the level of nonstructural carbohydrate which promotes the rate of growth relative to the rate of maintenance respiration.Although temperature has a major influence on plant growth, attempts to predict the response are confounded by several phenomena. The heat sum or growing degree day concept (26) predicts the development of a crop growing in the field solely from the accumulation of heat units above a base temperature. A more complex temperature response of growth is seen under controlled, constant-temperature conditions. At 5 to 20°C, the rate of growth increases exponentially; at 20 to 30°C, it levels off; and above 30 to 35°C, the growth rate falls (9,19,27). This has been ascribed to inactivation of an enzyme crucial to growth metabolism both at high and low temperatures which modifies the usual exponential temperature dependence of an enzyme reaction rate (21). Neither model explains the nonadditive effect of fluctuating diurnal temperatures (27) or the influence of light and CO2 (4,9,19) on the growth response.At a constant temperature, the rate of plant growth is linearly related to the rate of photosynthesis (8,13,25). However, the temperature dependence of growth and photosynthesis is not the same. Photosynthesis increases with temperature in an asymptotic manner to a plateau above 15°C (5, 10), while the growth rate increases exponentially in this interval and falls rapidly at temperatures above 25°C (9,19,27). This divergence occurs because only some of the carbohydrate is used to promote growth and the rest is used to maintain the plant in the current state (15,18,20 experimentally from respiration due to growth by plotting the total dark respiration versus the growth rate (13, 23). Growth respiration and maintenance respiration increase exponentially up to 20°C (13, 18). Whereas growth starts to decrease above 25°C, maintenance keeps increasing. This concept accounts for the carbohydrate mass balance of plant metabolism; but, more information is required to explain why maintenance is promoted at higher temperatures and growth is not.In this report, Okhams razor is applied to derive the simplest model that predi...

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A Theoretical Basis of Growth and Maintenance Respiration

Cited by 45 publications

References 6 publications

A Model of Assimilate Partitioning and Utilization in Shoots and Roots in the Vegetative Stage ofLolium multiflorum

A Model of Assimilate Partitioning and Utilization in Shoots and Roots in the Vegetative Stage ofLolium multiflorum

A compartmental model of carbon allocation in the vegetative barley plant

Temperature Dependence of Vegetative Growth and Dark Respiration: A Mathematical Model

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