Variations in Growth, Photosynthesis and Defense System Among Four Weed Species Under Increased UV‐B Radiation

Wang, Shiwen; Liu, Duan; Eneji, A. Egrinya; Li, Zhaohu

doi:10.1111/j.1744-7909.2007.00466.x

Cited by 11 publications

(9 citation statements)

References 37 publications

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“…In the present experiment, a pronounced negative response under eUV-B was recorded on most of the growth parameters (plant height, root length, number of leaves) at all the growth stages suggesting that H. contortus BL-1 was unable to maintain its normal growth under UV-B exposure. Similar results were also reported due to UV-B on three weed species, Abutilon theophrasti Medik, Amaranthus retroflexus L., and Chloris virgata Swartz (32). The change in responses of Heteropogon sp to a fix factor (eUV-B) is subjected to changes in variable factors (age and ambient UV-B).…”

Section: Discussionsupporting

confidence: 81%

Heteropogon contortusBL‐1 (Pilli Grass) and Elevated UV‐B Radiation: The Role of Growth, Physiological, and Biochemical Traits in Determining Forage Productivity and Quality

Hamid

Singh

Agrawal

et al. 2018

Photochem & Photobiology

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Exposure to elevated UV-B (eUV-B) is well known for its phytotoxicity, although studies made with UV-B exposure and its impact on grasses are limited especially from tropical countries including India. In this study, responses of a valuable grass species, Heteropogon contortus BL-1, were assessed under eUV-B (over ambient UV-B) at different growth stages. Damage caused by eUV-B was observed in the form of membrane damage and loss of pigments at early stages of growth, whereas tannin, phenol, and protein contents showed their increments at all the growth stages, to overcome the imposed stress. Reducing sugar showed its decline at all the growth stages, whereas starch and sucrose contents were higher mostly at later ages of plant growth. eUV-B caused a marked variations in anatomical structures with increase of mesophyll and spongy parenchymatous cells in leaves to reduce severity of irradiation, to maintain the growth and productivity. The study also highlights the significant negative influence of eUV-B on the growth of H. contortus BL-1 and its adaptive strategy to minimize the negative impacts. With the progression of age, plants although adopted to UV-B stress with maintenance of productivity, but palatability of forage was affected due to increment of tannin content.

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Section: Discussionsupporting

confidence: 81%

Heteropogon contortusBL‐1 (Pilli Grass) and Elevated UV‐B Radiation: The Role of Growth, Physiological, and Biochemical Traits in Determining Forage Productivity and Quality

Hamid

Singh

Agrawal

et al. 2018

Photochem & Photobiology

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“…However, the leaf curling observed on plants exposed to high levels of UV-B or exposed to UV-C radiation, as in this study, may relate to the induction by UV exposure of cell death and oxidative damage (Tang et al 2010). The leaf glazing (increased reflectivity of the upper leaf surface) that was observed may be attributed to alterations in the epicuticular wax layer, which has been shown to increase light reflection and, therefore, to limit light penetration into the mesophyll ( Kakani et al 2003;Wang et al 2007). Leaf bronzing has been suggested to involve the oxidation of phenolics in damaged cells (Cline & Salisbury 1966).…”

Section: Discussionmentioning

confidence: 51%

“…; Wang et al . ). Leaf bronzing has been suggested to involve the oxidation of phenolics in damaged cells (Cline & Salisbury ).…”

Section: Discussionmentioning

confidence: 97%

Sub‐lethal UV‐C radiation induces callose, hydrogen peroxide and defence‐related gene expression in Arabidopsis thaliana

2014

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Exposure of plants to UV-C irradiation induces gene expression and cellular responses that are commonly associated with wounding and pathogen defence, and in some cases can lead to increased resistance against pathogen infection. We examined, at a physiological, molecular and biochemical level, the effects of and responses to, sub-lethal UV-C exposure on Arabidopsis plants when irradiated with increasing dosages of UV-C radiation. Following UV-C exposure plants had reduced leaf areas over time, with the severity of reduction increasing with dosage. Severe morphological changes that included leaf glazing, bronzing and curling were found to occur in plants treated with the 1000 J·m(-2) dosage. Extensive damage to the mesophyll was observed, and cell death occurred in both a dosage- and time-dependent manner. Analysis of H₂O₂ activity and the pathogen defence marker genes PR1 and PDF1.2 demonstrated induction of these defence-related responses at each UV-C dosage tested. Interestingly, in response to UV-C irradiation the production of callose (β-1,3-glucan) was identified at all dosages examined. Together, these results show plant responses to UV-C irradiation at much lower doses than have previously been reported, and that there is potential for the use of UV-C as an inducer of plant defence.

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“…Leaf wax plays important roles in protecting some species from UV‐B radiation damage. In previous reports, leaf wax responses to increased UV‐B radiation have varied in different experiments .…”

Section: Resultsmentioning

confidence: 99%

Enhanced UV‐B Radiation Increases Glyphosate Resistance in Velvetleaf (Abutilon theophrasti)

Yin

Zhang

et al. 2012

Photochem & Photobiology

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Depletion of the ozone layer leads to increasing UV-B radiation on the earth's surface, which may affect weeds and their responses to herbicides. However, the effect of increased UV-B radiation on weeds and the interaction of weeds and herbicides are still obscure. The objective of this study was to compare glyphosate efficacy on velvetleaf that was grown under with and without increased UV-B radiation. Leaf area, dry weight and net photosynthesis of velvetleaf seedlings were adversely affected by increased UV-B radiation. Leaf cuticle wax significantly increased by 28% under increased UV-B radiation. Glyphosate efficacy on velvetleaf, evaluated by shoot dry weight, was significantly decreased by increased UV-B radiation. Exposure to increased UV-B radiation significantly decreased (14)C-glyphosate absorption from 49% to 43%, and also resulted in less (14)C-glyphosate translocation out of treated leaves and less glyphosate accumulation in newly expanded leaves. The decrease in glyphosate efficacy was due to changes in absorption and distribution, which were attributed to increased cuticle wax and decreased photosynthesis caused by increased UV-B radiation. These results suggest that the responses of weeds to herbicides may be affected by increased UV-B radiation, to the extent that higher rates may be required to achieve the desired effects.

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Variations in Growth, Photosynthesis and Defense System Among Four Weed Species Under Increased UV‐B Radiation

Cited by 11 publications

References 37 publications

Heteropogon contortusBL‐1 (Pilli Grass) and Elevated UV‐B Radiation: The Role of Growth, Physiological, and Biochemical Traits in Determining Forage Productivity and Quality

Heteropogon contortusBL‐1 (Pilli Grass) and Elevated UV‐B Radiation: The Role of Growth, Physiological, and Biochemical Traits in Determining Forage Productivity and Quality

Sub‐lethal UV‐C radiation induces callose, hydrogen peroxide and defence‐related gene expression in Arabidopsis thaliana

Enhanced UV‐B Radiation Increases Glyphosate Resistance in Velvetleaf (Abutilon theophrasti)

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