Exclusion of solar UV-B (280–315 nm) radiation on vegetative growth and photosynthetic activities in Vigna unguiculata L.

Lingakumar, K.; Amudha, P.; Kulandaivelu, G.

doi:10.1016/s0168-9452(99)00076-x

Cited by 29 publications

(20 citation statements)

References 18 publications

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“…These results correspond to the earlier field studies (Ziska et al, 1991;Nouchi et al, 1995;Lingakumar et al, 1999). A significant increase in the shoot length also had occurred in Cyamopsis when the UV-B and UV-B/A components in sunlight were removed.…”

Section: Discussionsupporting

confidence: 91%

Impacts of ambient solar uv (280-400 nm) radiation on three tropical legumes

2005

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Tropical regions receive the highest level of global solar ultraviolet (UV) radiation especially UV-B (280-320 nm).The average daily dose of the UV-B radiation in Madurai, South India (10 ~ N) is 10 kJ m -2. This is approximately 50% more than the average daily UV-B radiation in many European countries. A field study was conducted using selective filters to remove either the UV-B (< 320 nm) or UV-B/A (<400 rim) of the solar spectrum, and the effects were followed in Cyamopsis tetragonoloba, Vigna mungo, and Vigna radiata to determine their sensitivity to UV. When compared to ambient radiation, exclusion of solar UV-B increased the seedling height, leaf area, fresh weight and dry weight and the crop yield by 50% in the case of Cyamopsis, and the extent of such increase was slightly less under UV-B/A exclusion. In V. mungo a significant reduction was seen in solar UV excluded plants while V. radiata was found to be unaffected.

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Section: Discussionsupporting

confidence: 91%

Impacts of ambient solar uv (280-400 nm) radiation on three tropical legumes

2005

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“…3.2). Similar observations exist for other species, such as P. sylvestris (Turunen et al 1999) and Vigna unguiculata L. (Lingakumar et al 1999). Interestingly, in fruit grown without UV irradiation, the amount of these compounds remained at the levels characteristic of shaded (adapted to low fluxes of solar radiation) tissues but never dropped to zero (cf.…”

Section: Accumulation Of Different Phenolic Compounds In Response To supporting

confidence: 63%

Stress-Induced Buildup of Screening Pigments

Solovchenko

2010

Springer Series in Biophysics

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This chapter extends the discussion of screening pigments with an outline of possible mechanisms for the induction and regulation of their biosynthesis under stresses. Typical patterns of changes in pigment content and composition during the accumulation of screening pigments in plants are presented. Special attention is paid to the role of solar UV radiation in the induction of phenolics (which are admittedly the most ubiquitous and probably most studied screening pigment group) and to photostability of extrathylakoid carotenoids (the screening function of which is being vigorously investigated).As stated in the previous chapter, the pronounced buildup of screening pigment content observed in response to elevated levels of radiation of the corresponding spectral band is a prerequisite for the function of the screening pigment. The patterns of accumulation of different groups of screening pigments in microalgae and higher plants during their acclimation to high fluxes of solar radiation are considered below. However, before proceeding to the discussion, several reservations have to be made. Firstly, there are many works on accumulation of phenolics in leaves and other plant organs induced by natural and artificial UV radiation and the ecological and physiological significance of this phenomenon which are given full credit but could not be cited here in full number owing to space constraints. Therefore, only important trends will be outlined with a minimum of references; for detailed accounts of these experimental works, one may refer to recent reviews in the field (see, e.g., Beggs et al. (1986), Caldwell et al. (2007, Rozema et al. (1997)). Secondly, considerable attention has been paid to accumulation of secondary carotenoids which could serve as screening compounds since much less is known about this phenomenon in comparison with accumulation of phenolics.

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“…to UV-B removal at New Delhi (28.6 N), Pal et al (1997) found the bean to be much more responsive to UV-B than the maize. Vigna unguiculata grown under a similar UV-B exclusion at 10ºN latitude, where we assume UV-B could be more intense, responded to UV-B to a lesser extent (Lingakumar et al, 1999).…”

Section: Uv Exclusion Studiesmentioning

confidence: 99%

Solar UV-B Radiation and Global Dimming: Effects on Plant Growth and UV-Shielding

Ryel

Flint

Barnes

2010

UV Radiation in Global Climate Change

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Atmospheric aerosols and other particulates have been linked to reductions in shortwave radiation (global dimming). While much research has focused on the effects on plants caused by ambient and elevated UV-B (290 nm 320 nm), the direct effects of global dimming, and those mediated by associated changes in UV-B radiation, have not been effectively assessed. We conducted an experiment in the high-UV environment of Mauna Kea, Hawaii to compare the effects of UV-B reduction with a simulation of global dimming (accomplished with 13% shading). Using fava beans, (Vicia faba), we found that structural differences due to the treatments were minimal in this high light environment. Most surprising was the minimal effect of UV-B on plant growth given the high UV-B environment. However, both UV-B and shading significantly influenced epidermal UV transmittance, suggesting that changes that occur in secondary chemistry can affect epidermal transmittance for UV. Additional experiments suggest that the change in epidermal transmittance due to shading would most likely occur with foliage in highshade environments. Such changes in secondary chemistry have the potential to affect herbivory, nutrient cycling, and plant response to pathogens. While there are few experimental studies that specifically address possible reductions in radiation due to global dimming, many UV reduction experiments have been conducted in recent decades. Attempts to generalize latitudinal responses from these studies, however, are frustrated by a number of factors. Chief among them are different methodologies (reduction of different UV wavebands in different experiments) and a lack of reporting UV irradiance levels.

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Exclusion of solar UV-B (280–315 nm) radiation on vegetative growth and photosynthetic activities in Vigna unguiculata L.

Cited by 29 publications

References 18 publications

Impacts of ambient solar uv (280-400 nm) radiation on three tropical legumes

Impacts of ambient solar uv (280-400 nm) radiation on three tropical legumes

Stress-Induced Buildup of Screening Pigments

Solar UV-B Radiation and Global Dimming: Effects on Plant Growth and UV-Shielding

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