Effect of low doses of UV-A and UV-B radiation on photosynthetic activities inPhaseolus mungo L.

Jayakumar, Muthukrishnan; Amudha, P.; Kulandaivelu, G.

doi:10.1007/bf03030639

Cited by 20 publications

(10 citation statements)

References 48 publications

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“…This will result in higher exposure of crops to ambient UV-A radiation (WMO, 2010). Only a few authors have considered UV-A impacts on plant growth (Tezuka et al, 1994;Jayakumar et al, 2003Jayakumar et al, , 2004Verdaguer et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants

Dáder

Gwynn‐Jones

Moreno

et al. 2014

Journal of Photochemistry and Photobiology B: Biology

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Ultraviolet (UV) radiation directly regulates a multitude of herbivore life processes, in addition to indirectly affecting insect success via changes in plant chemistry and morphogenesis. Here we looked at plant and insect (aphid and whitefly) exposure to supplemental UV-A radiation in the glasshouse environment and investigated effects on insect population growth. Glasshouse grown peppers and eggplants were grown from seed inside cages covered by novel plastic filters, one transparent and the other opaque to UV-A radiation. At a 10-true leaf stage for peppers (53 days) and 4-true leaf stage for eggplants (34 days), plants were harvested for chemical analysis and infested by aphids and whiteflies, respectively. Clip-cages were used to introduce and monitor the insect fitness and populations of the pests studied. Insect pre-reproductive period, fecundity, fertility and intrinsic rate of natural increase were assessed. Crop growth was monitored weekly for 7 and 12 weeks throughout the crop cycle of peppers and eggplants, respectively. At the end of the insect fitness experiment, plants were harvested (68 days and 18-true leaf stage for peppers, and 104 days and 12-true leaf stage for eggplants) and leaves analysed for secondary metabolites, soluble carbohydrates, amino acids, total proteins and photosynthetic pigments. Our results demonstrate for the first time, that UV-A modulates plant chemistry with implications for insect pests. Both plant species responded directly to UV-A by producing shorter stems but this effect was only significant in pepper whilst UV-A did not affect the leaf area of either species. Importantly, in pepper, the UV-A treated plants contained higher contents of secondary metabolites, leaf soluble carbohydrates, free amino acids and total content of protein. Such changes in tissue chemistry may have indirectly promoted aphid performance. For eggplants, chlorophylls a and b, and carotenoid levels decreased with supplemental UV-A over the entire crop cycle but UV-A exposure did not affect leaf secondary metabolites. However, exposure to supplemental UV-A had a detrimental effect on whitefly development, fecundity and fertility presumably not mediated by plant cues as compounds implied in pest nutrition - proteins and sugars - were unaltered.

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Section: Introductionmentioning

confidence: 99%

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants

Dáder

Gwynn‐Jones

Moreno

et al. 2014

Journal of Photochemistry and Photobiology B: Biology

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“…Increase in the UV-B radiation is known to reduce biomass, leaf area, yield and photosynthesis (Golaszewska et al, 2003;Jayakumar et al, 2004;Pal et al, 2006;Guruprasad et al, 2007) and increased UV absorbing compound (Flint et al, 2004). Plants are more resistant to UV-B then are microbes or mammalian cells, because they produce a variety of secondary metabolites that effectively absorb UV-B and prevent it from penetrating leaf mesophyll Mazza et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Intraspecific variation in sensitivity to ambient ultraviolet-B radiation in growth and yield characteristics of eight soybean cultivars grown under field conditions

Baroniya¹,

Kataria²,

Pandey³

et al. 2011

Braz. J. Plant Physiol.

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The present study was conducted with eight cultivars of soybean (Glycine max) to determine the effect of exclusion of solar UV-B on the vegetative growth (plant height, leaf area, no. of nodes), UV absorbing compounds (implicated in UV protection) and crop yield (No. of pods and seed weight) and to determine the cultivar difference in their sensitivity to ambient UV-B. Exclusion of solar UV-B enhanced the vegetative growth and yield of all the soybean cultivars. The results showed a significant inverse association between the enhancement in vegetative growth and number of pods among the cultivars tested, indicating differences in the carbon partitioning amongst the cultivars by the way of exclusion of solar UV-B. NRC-7, Pusa-24 and JS-335 showed maximum promotion in vegetative growth and less enhancement in crop yield after solar UV-B exclusion. Kalitur, JS71-05, Hardee, PK-472 and PK-1029 showed improved performance both in terms of number of pods/plant and seed weight after solar UV-B exclusion. An enhancement in the crop yield by exclusion of solar UV-B indicated poor response of the cultivar to the ambient solar UV-B; these cultivars would be more suitable at latitudes, which received less UV-B. According to UV-SI, sensitivity of eight Indian soybean cultivars to ambient level of UV-B (280-320 nm) radiation had the following descending order; PK-472 > JS-335 > Hardee > Kalitur > JS71-05 > Pusa-24 > NRC-7 > PK-1029. These findings suggest the way to select the best-suited cultivar for particular latitude.

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“…Among these various factors, light quality affects stem elongation, lateral branching, leaf extension and pigmentation, and photosynthetic activity (Moe and Heins, 1990;Heo et al, 2003;Jayakumar et al, 2004). Desirable morphological characteristics can be obtained when horticultural plants are grown under less light and low temperatures, thereby reducing heat energy costs with only a minimal delay in their blooming (Merritt and Kohl, 1991 ).…”

mentioning

confidence: 98%

Influence of mixed LED radiation on the growth of annual plants

2006

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We investigated the effect of mixed radiation from light-emitting diodes (LEDs) on the growth and flowering of ageratum, marigold, and salvia bedding plants. Blue, red, and far-red lights were applied under controlled environmental conditions for 28 d. Both the combination of blue-plus-red radiation as well as fluorescent lighting treatment (control) caused increases in dry weights, but shoot lengths were shortest when plants were exposed to blue plus red light compared with either red or blue plus far-red treatments. The number of floral buds as well as the occurrence of flower opening for ageratum and salvia plants was also enhanced under the blue plus red mixture. Likewise, carbohydrate accumulation was stimulated by that combination compared with the other radiation treatments.Keywords: chlorophyll, light-emitting diodes, mixture radiation, morphogenesis, starch Environmental conditions, such as relative humidity, temperature, light intensity, and light quality, commonly influence the growth and development of plants. Among these various factors, light quality affects stem elongation, lateral branching, leaf extension and pigmentation, and photosynthetic activity (Moe and Heins, 1990;Heo et al., 2003;Jayakumar et al., 2004). Desirable morphological characteristics can be obtained when horticultural plants are grown under less light and low temperatures, thereby reducing heat energy costs with only a minimal delay in their blooming (Merritt and Kohl, 1991 ).The objectives of this study were (1) to produce ageratum, marigold, and salvia bedding plants with compact growth, good branching, and a large number of flowers when treated with different mixtures of radiation sources, and (2) to evaluate the starch and sugar contents, as well as the optimum chlorophyll fluorescence, that would cause minimal or no delays in blooming when those plants were grown under various combinations of radiation provided by lightemitting diodes (LEDs). MATERIALS AND METHODS Plant Materials and Growth ConditionsBedding plants of ageratum (Ageratum houstonianum Mill. cv. Blue Field), marigold (Tagetes erecta L. cv. Orange Boy), and salvia (Salvia splendens E Sello ex Ruem & Schult. cv. Red Vista) with two to four true leaves were used for our experimental materials. On Day 14 after sowing, all plants with two true leaves were transplanted to a plug tray (50 x 50 mm) filled with a soil mixture (BM1 ; Berger Horticulture, Canada) of 75 to 85% Canadian sphagnum peat moss, 15 to 20% perlite, and 4 to 10% vermiculite. Two types of liquid fertilizers, 20:10:20 and 14:0:14 (Plant Prod; Plant Products, Canada), were alternately applied at a rate of 100 ppm during the experimental period. We used an LED system (GF-320s; Good Feeling, Korea) comprising LED sticks, a panel, and a main controller to maintain a photosynthetic *Corresponding author; fax +82-43-272-5369 e-mail paekky@chungbuk.ac.kr photon flux (PPF) of 90 _+ 10 ~mol m -2 5 -1 over a 16-h photoperiod, as measured on an empty culture shelf. All plants were reared for 28 d in a growth c...

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Effect of low doses of UV-A and UV-B radiation on photosynthetic activities inPhaseolus mungo L.

Cited by 20 publications

References 48 publications

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants

Impact of UV-A radiation on the performance of aphids and whiteflies and on the leaf chemistry of their host plants

Intraspecific variation in sensitivity to ambient ultraviolet-B radiation in growth and yield characteristics of eight soybean cultivars grown under field conditions

Influence of mixed LED radiation on the growth of annual plants

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