Methoden der Wachstumsmessung

Ruge, Ulrich; Whaley, W. Gordon; Ziegler, H.

doi:10.1007/978-3-642-48934-1_3

Cited by 6 publications

(6 citation statements)

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“…Several quantitative methods based on digital image processing and sequence analysis have been developed and applied to study fluctuations in growth of various plant organs such as roots and leaves in recent years [13-15,30-32]. Other non-imaging methods for measurements of growth, such as “classical auxanometers” [33], linear voltage differential transducers (LVDTs) [34,35], rotary resistance transducers (RRTs) [2], direct assessment of plant size or subsequent manual assessment of displacement of markings that have been applied to the organ surface [36,37], exist and have been used both in field and climate chamber experiments. Yet they are limited either to measurements of one-dimensional growth (elongation), are labor intensive needing manual processing steps or do not provide a suitable high temporal or spatial resolution, as do quantitative methods based on image processing, which are thus preferable.…”

Section: Introductionmentioning

confidence: 99%

Diel leaf growth of soybean: a novel method to analyze two-dimensional leaf expansion in high temporal resolution based on a marker tracking approach (Martrack Leaf)

et al. 2013

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BackgroundWe present a novel method for quantitative analysis of dicot leaf expansion at high temporal resolution. Image sequences of growing leaves were assessed using a marker tracking algorithm. An important feature of the method is the attachment of dark beads that serve as artificial landmarks to the leaf margin. The beads are mechanically constricted to the focal plane of a camera. Leaf expansion is approximated by the increase in area of the polygon defined by the centers of mass of the beads surrounding the leaf. Fluctuating illumination conditions often pose serious problems for tracking natural structures of a leaf; this problem is circumvented here by the use of the beads.ResultsThe new method has been used to assess leaf growth in environmental situations with different illumination conditions that are typical in agricultural and biological experiments: Constant illumination via fluorescent light tubes in a climate chamber, a mix of natural and artificial illumination in a greenhouse and natural illumination of the situation on typical summer days in the field. Typical features of diel (24h) soybean leaf growth patterns were revealed in all three conditions, thereby demonstrating the general applicability of the method. Algorithms are provided to the entire community interested in using such approaches.ConclusionsThe implementation Martrack Leaf presented here is a robust method to investigate diel leaf growth rhythms both under natural and artificial illumination conditions. It will be beneficial for the further elucidation of genotype x environment x management interactions affecting leaf growth processes.

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Section: Introductionmentioning

confidence: 99%

Diel leaf growth of soybean: a novel method to analyze two-dimensional leaf expansion in high temporal resolution based on a marker tracking approach (Martrack Leaf)

et al. 2013

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“…Self evidently, the number of growth parameters that can be measured nondestructively is limited. Ruge (1961) studied changes in linear dimensions. Leaf size can also be measured nondestructively, but this involves mechanical disturbance aod can affect growth (Venus and Gauston 1983, p. 4).…”

Section: Introductionmentioning

confidence: 99%

Continuous shoot growth monitoring in hydroponics

Smolders

Merckx

Schoovaerts

et al. 1991

Physiologia Plantarum

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A weighing apparatus for automatic recording of fresh weight of shoots of spinach plants (Spinacia oleracea L., cv. Subito) growing in nutrient solution is described. The system was tested for 17 days in a controlled environment and enabled the determination of the relative growth rate (RGR) of the shoot fresh weight. Results from three consecutive growth experiments demonstrated diurnal fluctuations in the relative growth rate of the shoot fresh weight. In general, relative growth rates were between 0.32 and 0.36 day"' 16 days after sowing and decreased to between 0.11 and 0.18 day"' during the 12 foiiowing days. The variance between three replicate growth curves was compared with the variance of a growth function fitted through destructively obtained spinach shoot weight data.

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“…Plant physiologists have devised, over the years, a large number of instruments, known as auxanometers, that will allow the investigator to monitor the extension growth of plants or their organs (Ruge, 1960). Many of these auxano meters are unsuitable for classroom use, but, in 1920, W. Neilson Jones devised a simple, inexpensive auxanometer for measuring root growth of seedlings.…”

Section: Introductionmentioning

confidence: 99%