Transpiration, Intracellular Carbon Dioxide Concentration and Carbon-Isotope Discrimination of 24 Wild Species Differing in Relative Growth Rate

1994 ◽  
Vol 21 (4) ◽  
pp. 507 ◽  
Author(s):  
H Poorter ◽  
GD Farquhar
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Carbon Isotope Discrimination ◽  
Growth Parameters ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Root Weight ◽  
Relative Growth ◽  
Unit Leaf ◽  
Intercellular Co2

Various aspects of the water economy were investigated for a range of herbaceous species varying in relative growth rate. Plants were grown in a growth chamber with a non-limiting supply of water and nutrients, and the rate of transpiration, short-term intercellular CO2 concentration and long-term carbon isotope discrimination (Δ) in the leaves were determined. No correlation was found between the relative growth rate of these species, and the transpiration rate per unit leaf area, the intercellular CO2 concentration and the 13C-discrimination. There was a positive correlation, however, with the rate of water uptake per unit root weight. From these observations we infer that the previously observed differences in photosynthetic nitrogen-use efficiency, the rate of photosynthesis per unit leaf nitrogen, can not be explained by variation in intercellular CO2 concentration. These data were also used to analyse correlations between Δ and both growth parameters and chemical composition. Apart from parameters related to the water economy, Δ only correlated (positively) with the fractional biomass allocation to the roots (root weight ratio) and the specific root length (root length divided by root weight), and not with any other investigated growth parameters.

scholarly journals Growth Analysis of Wheat Using Machine Vision: Opportunities and Challenges

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6501
Author(s):  
Mohammad Ajlouni ◽  
Audrey Kruse ◽  
Jorge A. Condori-Apfata ◽  
Maria Valderrama Valencia ◽  
Chris Hoagland ◽  
...  
Keyword(s):  
Growth Rate ◽  
Machine Vision ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Growth Analysis ◽  
Growth Parameters ◽  
Dry Weight ◽  
Projected Area ◽  
Relative Growth ◽  
Leaf Dry Weight

Crop growth analysis is used for the assessment of crop yield potential and stress tolerance. Capturing continuous plant growth has been a goal since the early 20th century; however, this requires a large number of replicates and multiple destructive measurements. The use of machine vision techniques holds promise as a fast, reliable, and non-destructive method to analyze crop growth based on surrogates for plant traits and growth parameters. We used machine vision to infer plant size along with destructive measurements at multiple time points to analyze growth parameters of spring wheat genotypes. We measured side-projected area by machine vision and RGB imaging. Three traits, i.e., biomass (BIO), leaf dry weight (LDW), and leaf area (LA), were measured using low-throughput techniques. However, RGB imaging was used to produce side projected area (SPA) as the high throughput trait. Significant effects of time point and genotype on BIO, LDW, LA, and SPA were observed. SPA was a robust predictor of leaf area, leaf dry weight, and biomass. Relative growth rate estimated using SPA was a robust predictor of the relative growth rate measured using biomass and leaf dry weight. Large numbers of entries can be assessed by this method for genetic mapping projects to produce a continuous growth curve with fewer replicates.

scholarly journals Components of relative growth rate and nitrogen productivity of Brussels sprouts and leeks grown at two widely differing light intensities

1996 ◽  
Vol 44 (1) ◽  
pp. 21-29 ◽  
Author(s):  
A. Van Der Werf ◽  
C.T. Enserink ◽  
A.L. Smit ◽  
R. Booij
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Biomass Production ◽  
Field Experiments ◽  
Growth Chamber ◽  
Brussels Sprouts ◽  
Relative Growth ◽  
Unit Leaf ◽  
Growth Chamber Studies

Young vegetative Brussels sprout and leek plants were grown in a growth chamber at a light intensity of 550 micro mol m-2 s-1 or at only 20% of that intensity. In both light treatments, Brussels sprouts had a relative growth rate (RGR) ~90% higher than that of leeks, which was mainly explained by a higher leaf area ratio (LAR; msuperscript 2/kg plant). Only minor differences in the physiological component (net assimilation rate) were observed between the 2 species within a light treatment. The higher LAR of Brussels sprouts was mainly explained by higher specific leaf area. Brussels sprouts had a higher rate of biomass production per unit internal N (N productivity) than leeks. This was mainly explained by a higher allocation of N to leaves and a higher rate of biomass production per unit leaf N. It is suggested that the higher biomass production per unit of N taken up in Brussels sprouts than leeks as observed in the field is explained by higher N productivity. The results obtained from the growth chamber studies are discussed in relation to field experiments and data from the literature.

scholarly journals Seed Yield of Mungbean (Vigna radiata(L.) Wilczek) in relation to Growth and Developmental Aspects

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
M. M. A. Mondal ◽  
A. B. Puteh ◽  
M. A. Malek ◽  
M. R. Ismail ◽  
M. Y. Rafii ◽  
...  
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Growth Parameters ◽  
Net Assimilation Rate ◽  
Growth Stages ◽  
Flower Initiation ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Net Assimilation

Growth parameters such as leaf area (LA), total dry mass (TDM) production, crop growth rate (CGR), relative growth rate (RGR), and net assimilation rate (NAR) were compared in six varieties of mungbean under subtropical condition (24°8′ N 90°0′ E) to identify limiting growth characters for the efficient application of physiology breeding for higher yields. Results revealed that a relatively smaller portion of TDM was produced before flower initiation and the bulk of it after anthesis. The maximum CGR was observed during pod filling stage in all the varieties due to maximum leaf area (LA) development at this stage. Two plant characters such as LA and CGR contributed to the higher TDM production. Results indicated that high yielding mungbean varieties should possess larger LA, higher TDM production ability, superior CGR at all growth stages, and high relative growth rate and net assimilation rate at vegetative stage which would result in superior yield components.

scholarly journals Growth responses of light demanding and shade tolerant peat swamp forest saplings to elevated CO2

2021 ◽  
Vol 42 (3(SI)) ◽  
pp. 735-743
Author(s):  
M.N.L. Wahidah ◽  
◽  
M.S. Nizam ◽  
C.M.Z. Che Radziah ◽  
W.A. Wan Juliana ◽  
...  
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Elevated Co2 ◽  
Co2 Concentration ◽  
Growth Responses ◽  
Swamp Forest ◽  
Relative Growth ◽  
Peat Swamp Forest ◽  
Elevated Atmospheric Co2

Aim: To determine the growth responses of two peat swamp forest species, Shorea platycarpa, a shade-tolerant slow-growing species and Macaranga pruinosa, a light-demanding fast-growing species under elevated atmospheric CO2 concentration. Methodology: The saplings of both species were grown in a shade house at ambient (400±50 µmol mol-1) and in an open roof ventilation greenhouse at elevated atmospheric CO2 concentration 800±50 µmol mol-1 for seven months. The temperature in both environments ranged between 25-33°C with 55–60% sunlight transmittance and the saplings were thoroughly watered twice a day. Plants growth measurements were estimated at frequent intervals. Saplings biomass characteristics were examined using destructive methods after seven months of treatment and non-destructive method was used for determination of leaf area. Results: Elevated CO2 enhanced all the growth characteristics in M. pruinosa with a significant increase was observed particularly on both height and diameter relative growth rate and biomass characteristics. The height relative growth rate and leaf area were significantly reduced under elevated CO2 in S. platycarpa but did not affect the shoot or root diameter and biomass significantly. A positive correlation (r =0.77, p>0.05) between stem biomass and basal diameter for plants under elevated CO2 was recorded for M. pruinosa, but not in S. platycarpa. Both species showed negative correlation (S. platycarpa; r = -0.53, M. pruinosa; r = -0.46, p>0.05) between stem growth and stem biomass at elevated CO2. Interpretation: These results unveiled profound effects of elevated CO2 on the growth of light-demanding species M. pruinosa, while shade-tolerant species S. platycarpa was not relatively affected by elevated CO2. This underscored the necessity to analyse different species performance to elevated CO2, thereby improving the ability to predict tropical swamp forest ecosystem responses to rising CO2.

scholarly journals Biomass Accumulation in the Fern Asplenium nidus avis (L) under Root Restriction

2020 ◽  
pp. 1-9
Author(s):  
A. Pagani ◽  
J. Molinari ◽  
E. Giardina ◽  
A. Di Benedetto
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Growth Parameters ◽  
Biomass Accumulation ◽  
Dry Weight ◽  
Point Of View ◽  
Relative Growth ◽  
Net Assimilation ◽  
Root Restriction ◽  
Asplenium Nidus

Pot ornamental plant productivity is related to the environmental growth facilities but negatively affected by the pot root restriction syndrome. Most ferns showed a lower relative growth rate and long production cycles (24 months or more) for which growers use small pots to increase yield per unit area of greenhouse. The aim of this work was to analyze growth changes in response to different pot volume in plants of A. nidus avis spore-propagated under the hypothesis that it would play a role as an abiotic stress which decrease commercial productivity. Our results showed that the use of big pots increased fresh and dry weight and frond area (the main aesthetic trait). When growth parameters were performed, a higher the frond appearance rate (RLA), the frond area expansion (RLAE) and the frond thickness (SLA) were found in 1500 cm3 pot as well as the relative growth rate (RGR) and the net assimilation rate. The use of biggest pot for fern cropping stimulated biomass accumulation through a higher capacity to initiate and expand fronds, to increase photosynthetic rates and change photo assimilate partitioning which favor shoots. From the grower´s point of view, our results suggested that higher yields of A. nidus avis fern would be reached decreasing root restriction, that is, to use the biggest pot volume from the early transplant from plug trays.

Genotypic Variation in Relative Growth Rate and Carbon Isotope Discrimination in Sunflower Is Related to Photosynthetic Capacity

1996 ◽  
Vol 23 (2) ◽  
pp. 227 ◽  
Author(s):  
JM Virgona ◽  
DG Farquhar
Keyword(s):  
Growth Rate ◽  
Carbon Isotope ◽  
Relative Growth Rate ◽  
Carbon Isotope Discrimination ◽  
Photosynthetic Capacity ◽  
Genotypic Variation ◽  
Wild Accession ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Isotope Discrimination

A previous study showed that carbon isotope discrimination (Δ) was negatively related to transpiration efficiency (W, the ratio of dry matter accumulation to transpiration) and biomass accumulation amongst sunflower (Helianthus annuus L.) genotypes. Three experiments which explore the physiological basis of relationships between Δ, relative growth rate (RGR) and leaf gas exchange characteristics are reported. Growth was analysed on seven genotypes during the early vegetative stage (up to 31 days after emergence). Carbon isotope discrimination, Δ, W, and photosynthetic CO2 assimilation rate per unit leaf area (A) at ambient concentration of CO2 were measured on plants that made up the final harvest. Six of the seven genotypes were also grown under a low nitrogen (N) regime and harvested at 30 days after emergence. Carbon isotope discrimination was negatively related to relative growth rate (RGR), net assimilation rate (NAR) and photosynthetic rate per unit area, which in turn, were all positively correlated with each other. Genotypic variation inA (51%) was greater than that in leaf conductance, g (32%) and there was no relationship between g and Δ. Under the low N regime, A and g declined by 33 and 12%, respectively, across all genotypes producing a significant rise in A of 1.10. In a second experiment, growth analysis on 13 cultivated forms of H. annuus, a wild accession and a H. argophyllus accession, also showed that there was a positive relationship between RGR and NAR, and that both growth indices were negatively related to Δ. In a further experiment, using 14 genotypes (including the wild accession) there was a highly significant negative correlation (r = -0.85, P < 0.001) between photosynthetic capacity, measured using an oxygen electrode, and Δ. These results indicate that variation in photosynthetic capacity can account for genotypic variation in both Δ and RGR during vegetative growth in sunflower. Hence, faster growing sunflower genotypes have higher rates of photosynthesis and use water more efficiently.

The early vegetative growth of two annual pasture grasses (Hordeum leporinum Link and Lolium rigidum Gaud.)

1973 ◽  
Vol 24 (1) ◽  
pp. 11 ◽  
Author(s):  
PS Cocks ◽  
CM Donald
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Vegetative Growth ◽  
Root Weight ◽  
Lolium Rigidum ◽  
Pasture Production ◽  
Relative Growth ◽  
Pasture Grasses ◽  
Seedling Growth Rate ◽  
Hordeum Leporinum

The early vegetative growth of Houdeum Iepouinum and Lolium rigidum was studied at three temperatures in a controlled environment cabinet. The seedling growth rate in each species was much more rapid during the period of endosperm availability than after cndospcrm exhaustion. At the temperatures tested (10, 17, and 24�C) the relative growth rate of Lolium was greater than that of Houdeum, with a relatively slight difference at 10 and 24�, but with a considerable difference at 17�. In spite of the superior relative growth rate of Lolium, seedlings of Houdeum were, for a considerable period following emergence, larger in terms of total weight, leaf area, root weight, root depth, and plant height because of the greater seed size. The length of this period of greater size depended on the temperature, being least (c. 26 days) at 17�C, when the advantage of Lolium was greatest. The implications of these findings in pasture production in southern Australia, and especially in the competitive relationships of Hordeum and Lolium, are described.

scholarly journals A Sustainable Solution to Obtain P-K-Mn Glass Fertilizers from Cheap and Readily Available Wastes

2021 ◽  
Vol 18 (12) ◽  
pp. 6585
Author(s):  
Cosmin Vancea ◽  
Giannin Mosoarca ◽  
Simona Popa
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Positive Impact ◽  
Growth Parameters ◽  
Raw Materials ◽  
Drinking Water Treatment ◽  
Intraparticle Diffusion ◽  
Relative Growth ◽  
Intraparticle Diffusion Model ◽  
Leaching Process

The sustainable economy framework imposes the adoption of new ways for waste reuse and recycling. In this context, this paper proposes a new alternative to obtain glass fertilizers (agriglasses) by reusing two cheap and easily available wastes, wood ash and manganese rich sludge resulting from drinking water treatment processes for groundwater sources. Glasses were obtained using different amounts of wastes together with (NH4)2HPO4 and K2CO3 as raw materials. The P-K-Mn nutrient solubilization from the obtained glasses was investigated using a citric acid solution. The kinetics of the leaching process was studied after 1, 7, 14, 21 and 28 days, respectively. The intraparticle diffusion model was used to interpret kinetic data. Two distinct stages of the ion leaching process were recorded for all of the studied compositions: first through intraparticle diffusion (the rate-controlling stage) and second through diffusion through the particle–medium interface. The fertilization effect of the obtained agriglasses was studied on a barley crop. The specific plant growth parameters of germination percentage, average plant height, biomass and relative growth rate were determinate. The positive impact of the agriglasses upon the plants biomass and relative growth rate was highlighted. The effects of agriglasses can be tuned through glass compositions that affect the solubility of the nutrients.

Analysis of interspecific variation in plant growth responses to nitrogen

2002 ◽  
Vol 80 (1) ◽  
pp. 34-41 ◽  
Author(s):  
Daniel R Taub
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Specific Leaf Area ◽  
Weight Ratio ◽  
Response Ratio ◽  
Relative Growth ◽  
Unit Leaf ◽  
Leaf Weight Ratio ◽  
Low Nitrogen

Plant species differ greatly in their growth responses to nutrients, but little is known about the physiological and morphological factors that are responsible for this variation. To address this question, I measured the responses to added nitrogen of relative growth rate and three of its components (specific leaf area, unit leaf rate, and leaf weight ratio) for 17 C3 grass species. Plants were grown in sand culture in a greenhouse and were fertilized daily with either 5 or 0.05 mM NH4NO3. For most species, growth response to nitrogen was primarily associated with an increased mass allocation to leaves at high versus low nitrogen. Across all species, the average response at high versus low nitrogen was a 37% increase in leaf weight ratio, a 12% increase in unit leaf rate, and a 4% decrease in specific leaf area. Interspecific differences in growth response to nitrogen, however, were associated primarily with species differences in the response of unit leaf area to nitrogen supply. I determined the nitrogen response ratio of each parameter as the value of the parameter at high nitrogen divided by the value at low nitrogen. The rank-order correlation between the unit leaf area response ratio and the relative growth rate response ratio was 0.88. Reanalysis of previous experiments on plant nutrient response showed a similar pattern. In all studies, interspecific variation in the response of relative growth rate to nutrients was associated primarily with interspecific differences in the plastic response of unit leaf area.Key words: leaf weight ratio, net assimilation rate, plant growth analysis, relative growth rate, specific leaf area, unit leaf rate.

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