Effects of leaf and tree age on chlorophyll absorbance in diploid black wattle (<i>Acacia mearnsii</i>)

Fossey, Annabel; Mathura, Sadhna; Beck-Pay, S.L.

doi:10.2989/sf.2009.71.1.8.745

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…Therefore, the lost function of chloroplast and the broken chlorophyll cause yellow and dying leaf not able to photosynthesize. Supported by [15] explains that the age of trees and leaves also affect the chlorophyll content. Leaves at a young age have higher light absorbance than the yellowed old leaves that have low light absorbance.…”

Section: Resultsmentioning

confidence: 99%

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The Effect of Noni Leaves’ Age Variation On the Value of Absorbance and Wavelength In Certain Color Spectrums

Mouromadhoni

Kuswanto

Asmar

2019

J. Ilmu. Pend. Fisika

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This research is experimental research. The research aims to analyze the absorbance and wavelength values on the certain color spectrum based on the age of noni leaf sample. Variation in absorption and wavelength occurs in the red spectrum ranges between 650 to 700 nm. Maximum absorption occurs in the middle of noni leaf followed by the tip of noni leaf sample but the yellow leaf sample results poor absorption. Chlorophyll a has main leaf pigment the most which occurs in the light reaction of photosynthesis. The maximum absorption which ranges between 3,5 to 4,0 A occurs in the blue spectrum ranges between 400 to 450 nm. Chlorophyll b absorbs photon energy in sun light. A wavelength ranges between 500 to 600 nm occurs in the green spectrum which has low absorption of three samples ranges 0,5 to 1,5 A. The chlorophyll reflects light of the green spectrum; therefore, it causes low absorption.

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Section: Resultsmentioning

confidence: 99%

“…The age of trees and leaves also affect the chlorophyll content. Leaves at a young age have higher light absorbance than the yellowed old leaves that have low light absorbance [15]. Based on this description, the researchers determine the result of "…”

Section: Introductionmentioning

confidence: 99%

The Effect of Noni Leaves’ Age Variation On the Value of Absorbance and Wavelength In Certain Color Spectrums

Mouromadhoni

Kuswanto

Asmar

2019

J. Ilmu. Pend. Fisika

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“…The invasive potential of commercially farmed Acacia species could be substantially reduced by inducing sterility through gamma radiation of seed or the production of triploids through chromosome doubling techniques. Flowering in plants grown from irradiated seed can be significantly reduced Beck & Fossey, 2007), and tetraploid A. mearnsii plants have been developed (Beck et al, 2003a(Beck et al, ,b,c, 2005Mathura et al, 2006;Fossey et al, 2009). Controlled crosses between tetraploids and diploids are being made and their progeny tested.…”

Section: Development Of Sterile Cultivarsmentioning

confidence: 99%

National‐scale strategic approaches for managing introduced plants: insights from Australian acacias in South Africa

Wilgen¹,

Dyer²,

Hoffmann³

et al. 2011

Diversity and Distributions

158

184

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Aim A range of approaches and philosophies underpin national‐level strategies for managing invasive alien plants. This study presents a strategy for the management of taxa that both have value and do harm. Location South Africa. Methods Insights were derived from examining Australian Acacia species in South Africa (c. 70 species introduced, mostly > 150 years ago; some have commercial and other values; 14 species are invasive, causing substantial ecological and economic damage). We consider options for combining available tactics and management practices. We defined (1) categories of species based on invaded area (a surrogate for impact) and the value of benefits generated and (2) management regions based on habitat suitability and degree of invasion. For each category and region, we identified strategic goals and proposed the combinations of management practices to move the system in the desired direction. Results We identified six strategic goals that in combination would apply to eight species categories. We further identified 14 management practices that could be strategically combined to achieve these goals for each category in five discrete regions. When used in appropriate combinations, the prospect of achieving the strategic goal will be maximized. As the outcomes of management cannot be accurately predicted, management must be adaptive, requiring continuous monitoring and assessment, and realignment of goals if necessary. Main conclusions Invasive Australian Acacia species in South Africa continue to spread and cause undesirable impacts, despite a considerable investment into management. This is because the various practices have historically been uncoordinated in what can be best described as a strategy of hope. Our proposed strategy offers the best possible chance of achieving goals, and it is the first to address invasive alien species that have both positive value and negative impacts.

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“…To further reduce the instrument dependence for point-of-care screening, intelligent portable devices have been employed to achieve instant analysis owing to their capacity for colorimetric data collection and processing. , For instance, Li et al fabricated a simple sensing platform for enrofloxacin analysis based on the grayscale values of images decomposed by a smartphone application . However, all of these studies used the absorption of CTC at the visible region, which overlaps with chlorophyll, impeding further practical application in detection of plant-derived samples . Fortunately, our group and others recently discovered that CTC formed by the π–π interaction between diamine (TMB, as donor) and diimine (two-electron oxidation product, oxTMB 2+ , as acceptor) has a high absorption at the second near-infrared window (NIR-II). − Such unique absorption and photothermal effects at the NIR-II region not only have been widely used in diagnosis and treatment , but also possess the great potential of low-to-zero background, anti-interference, and rapid readout from a thermometer confronting complex environment for analysis and monitor. − Also, to the best of our knowledge, an NIR-II-induced, smartphone-assisted photothermal responsive and colorimetric assay has hardly been applied to food analysis and nutrient detection of actual samples of plant origins.…”

Section: Introductionmentioning

confidence: 99%

Near Infrared-II Photothermal and Colorimetric Synergistic Sensing for Intelligent Onsite Dietary Myrosinase Profiling

et al. 2023

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Myrosinase (Myr) is a type of critical βthioglucosidase enzyme activator essential for sustaining many functional foods to perform their health-promoting functions. An accurate and reliable Myr test is meaningful for food quality and dietary nutrition assessments, whereas the currently reported methods do not guarantee specificity and have high reliance on instrumentation, which are not suitable for rapid and onsite Myr screening especially in complex systems from various sources. Herein, we present a unique NIR-II absorption-based photothermal-responsive colorimetric biosensor for anti-interference onsite Myr determination and realization of rapid visualized outputs with the aid of smartphone calculation. Typically, assisted by glucose oxidase (GOx), Myr specifically converts the sinigrin substrate into hydrogen peroxide (H 2 O 2 ) that can oxidize 3,3′,5,5′tetramethylbenzidine (TMB) catalyzed by AuNPs to form a charge transfer complex (CTC) with NIR-II absorption and photothermal characters. Delightfully, such a proposed method is able to determine Myr within a wide range of 0 to 172.5 mU/mL with a detection limit down to 2.96 mU/mL. Moreover, simple, rapid, and real-time visual Myr identification in actual food-sourced samples could also be readily achieved by smartphone readout processing, with the promising advantages of anti-interference, high accuracy, and low cost as well as labor-saving and intelligence engagement, thus providing great feasibility for precise measurement in complex and dynamic dietary sample analysis. Overall, our proposed method presents a novel technology for onsite dietary Myr enzyme profiling, which is promising to be applied in the food industry for nutritional composition profiles, freshness evaluation, and quality assessment.

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Effects of leaf and tree age on chlorophyll absorbance in diploid black wattle (Acacia mearnsii)

Cited by 4 publications

References 2 publications

The Effect of Noni Leaves’ Age Variation On the Value of Absorbance and Wavelength In Certain Color Spectrums

The Effect of Noni Leaves’ Age Variation On the Value of Absorbance and Wavelength In Certain Color Spectrums

National‐scale strategic approaches for managing introduced plants: insights from Australian acacias in South Africa

Near Infrared-II Photothermal and Colorimetric Synergistic Sensing for Intelligent Onsite Dietary Myrosinase Profiling

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