Color indices for the assessment of chlorophyll development and greening of fresh market potatoes

Grunenfelder, Laura; Hiller, Larry K.; Knowles, N. Richard

doi:10.1016/j.postharvbio.2005.12.018

Cited by 40 publications

(36 citation statements)

References 11 publications

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“…In general, when a severe stress is imposed the recovery of growth is partial and may be related with the recovery of photosynthetic processes, although the maximum photosynthesis rate is not always recovered (Grzesiak, 2004). Saline stress seems to affect photosynthesis more in euonymus plants than in laurustinus plants, accelerating leaf senescence and reducing leaf area as has been observed in other species by Chaves et al, 2011and Navarro et al, 2007 As regards the colour parameters, leaves of the euonymus plants submitted to salinity were lighter, becoming yellowish green, perhaps as a consequence of the fall in chlorophyll levels in conjunction with other plant related factors (Heiskanen, 2005;Grunenfelder et al, 2006;Navarro et al, 2008). Nevertheless, in laurustinus only the leaves of NaCl plants showed decreased saturation and vividness compared with the control plants, getting a worst visual aspect.…”

Section: Discussionmentioning

confidence: 79%

Physiological mechanisms involved in the recovery of euonymus and laurustinus subjected to saline waters

Gómez-Bellot

Álvarez

Bañón

et al. 2013

Agricultural Water Management

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The scarcity of water has frequently led to saline water being reused for the irrigation of ornamental shrubs. However, before the use of such waters can be expanded, the salt tolerance and other characteristics of the ornamentals involved, need to be considered along with their capacity to recover after salinity exposure. For this reason, Euonymus japonica (euonymus) and Viburnum tinus (laurustinus) plants were submitted for twenty weeks to three irrigation treatments applied at 100% water holding capacity: Control (EC < 0.9 dS m-1); NaCl solution, NaCl (EC: 4 dS m-1); and wastewater, WW (EC: 4 dS m-1). This was followed by a recovery period of eight weeks, when all the plants were watered in the control irrigation conditions. The results showed that biomass, leaf number and total leaf area of plants subjected to the saline treatments were lower than in the control at the end of both periods in both species. However, after recovery, only euonymus showed lower growth parameters than those observed in the saline period. The highest Na + and Clconcentrations were observed in saline plants at the end of saline period for both species, and were higher in shoots than in roots. The opposite was observed for the K + /Na + and the Ca 2+/ Na + ratios. In Laurustinus, the ? stem did not diminish in the wastewater-irrigated plants with respect to the control, maintaining osmotic adjustment and a high ? t , even after recovery, whereas in euonymus this did not occur at the end of recovery period. In both species the P n and g s were similarly reduced during the saline exposure period. However, the recovery of gas exchange in laurustinus irrigated with wastewater might be closely related to the better water status of these plants. Although the aesthetic value and growth decreased in the plants of both species, the chemical properties of the waters applied had different effects in each case, especially as regards the capacity to recover from salinity. These results underline the 3 importance to studying the physiological mechanisms involved in the recovery of plants.

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Section: Discussionmentioning

confidence: 79%

Physiological mechanisms involved in the recovery of euonymus and laurustinus subjected to saline waters

Gómez-Bellot

Álvarez

Bañón

et al. 2013

Agricultural Water Management

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“…Potato tuber greening is associated with the development of glycoalkaloids which at certain concentrations impart a bitter flavour, cause sickness or even death (Grunenfelder, Hiller, & Knowles, 2006;Morris & Lee, 1984;Phlak & Sporns, 1992). Consequently, both marketers and consumers avoid greening potatoes.…”

Section: Discussionmentioning

confidence: 99%

Can sequential harvesting help small holder organic farmers meet consumer expectations for organic potatoes?

Katundu

Hendriks

Bower

et al. 2010

Food Quality and Preference

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“…Adamson et al [4] developed a method of measuring the senescence rate of wheat from the greenness of leaf color by a color digital camera. Grunenfelder et al [5] used color indices to assess the chlorophyll development and greening of fresh market potatoes. Bruce L. Boese et al [6] analyzied Zostera marina leaf injury by digital image method.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Chlorophyll Content Based on Image Color Analysis, Comparison with SPAD-502

Liu

Zhang

et al. 2010

2010 2nd International Conference on Information Engineering and Computer Science

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Leaf color has been commonly used as an index for crop stress status diagnosis. We have developed a low-cost and non-destructive method that is easy to use to assess the health status of plants, based on the estimation of chlorophyll content of leaves using a portable digital camera. Relationships between chlorophyll content and leaf image color indices in the RGB and Lab* space with the comparison of SPAD are examined. The RGB color indices of R, G and R+G+B, R-B, R+B, R+G and The Lab* space parameters L*, a* and b* had the significant relationship with chlorophyll content. Although the determination coefficient and prediction confidence intervals of color indices regression were not good than SPAD, the leave imaged tools had the profit of easy operation, found everywhere and no much money cost. The indices from leaf color image analysis maybe used to estimate chlorophyll content.

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Color indices for the assessment of chlorophyll development and greening of fresh market potatoes

Cited by 40 publications

References 11 publications

Physiological mechanisms involved in the recovery of euonymus and laurustinus subjected to saline waters

Physiological mechanisms involved in the recovery of euonymus and laurustinus subjected to saline waters

Can sequential harvesting help small holder organic farmers meet consumer expectations for organic potatoes?

Assessment of Chlorophyll Content Based on Image Color Analysis, Comparison with SPAD-502

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