Similarities in the biochemical changes between solar UV exclusion and GA application in Amaranthus caudatus

Abstract

Seedlings of Amaranthus caudatus grown under UV exclusion filters (-UV -B <320nm; -UV -B/A <400nm) in the ambient solar radiation showed an enhancement in growth. This was accompanied by reduction in the synthesis of betacyanin but enhancement in the level of amino acids and proteins. The growth promotion and the accompanying biochemical changes were similar to the external application of GA 3 to the seedlings under ambient solar radiation. The results are discussed in the light of similarities between UV exclusion and GA 3 application in terms of diversion of amino acid precursors towards enhanced primary metabolism.

Assessment of impact of solar UV components on growth and antioxidant enzyme activity in cotton plant

“…Since secondary and primary metabolic pathways compete for the common pool of carbon, reduction in secondary metabolism can channelize the carbon to primary metabolism. This type of enhanced channelization has been reported with respect to reduced betacyanin synthesis in Amaranthus plants grown under UV excluded sunlight (Sharma and Guruprasad 2009).…”

The impact of short‐term UV irradiation on grains of sensitive and tolerant cereal genotypes studied by EPR

“…It was found that elevated amounts of UV‐B radiation may influence physiological and biochemical processes in plant cells, for instance inhibition of photosynthesis, a hindering of nitrogen intake, and, in consequence, an inhibition of cell division, reduction of plant growth and a decrease of plant biomass . The negative influence of UV‐B radiation was confirmed by several UV exclusion studies , . It was shown that the impact of UV‐B irradiation varied considerably for different species and even cultivars, for example the study of two varieties of soybean grown under increased UV‐B radiation showed that yield of one of the cultivars was reduced by about 20%, whereas that of the second one was practically unaffected .…”

“…5 The negative influence of UV-B radiation was confirmed by several UV exclusion studies. 1,6 It was shown that the impact of UV-B irradiation varied considerably for different species and even cultivars, for example the study of two varieties of soybean grown under increased UV-B radiation showed that yield of one of the cultivars was reduced by about 20%, whereas that of the second one was practically unaffected. 4 The sensitivity of plants to UV-B depends on air temperature, precipitation and geographic origin of the species; plants growing in areas exposed to high levels of radiation are more tolerant to UV radiation than those which receive moderate irradiation.…”

Regulation of growth and development in phytochrome mutants of Arabidopsis thaliana by solar UV

“…Suppression of leaf growth by solar UV and a drastic enhancement in the area of leaves after the exclusion of UV has been observed in plants such as cotton (Dehriya et al 2011) and Amaranthus (Sharma and Guruprasad 2009). The number and the area of rosette leaves were enhanced by the exclusion of UV in WT Arabidopsis also.…”