Changes in the concentration of phenolic compounds and exudation induced by phosphate deficiency in bean plants (Phaseolus vulgaris L.)

Abstract

The effect of prolonged phosphate starvation of bean plants (Phaseolus vulgaris L.) on the concentration of phenolics and their exudation by roots was studied. Plants cultured on phosphate-deficient media maintained a steady concentration of total phenolics in the leaves, whereas in the leaves of plants grown on complete nutrient media the phenolic concentration decreased. After 18 days of culture, higher total phenolics and anthocyanin concentrations in phosphate-deficient leaves compared with control leaves were observed. The divergent trends in total phenolic concentrations between phosphate-deficient and control leaves corresponded to the changes in the activity of L-phenylalanine ammonia-lyase. In the roots, the concentration of total phenolics was lower in phosphate-deficient plants compared with control plants. However, after 18 days of culture of bean plants, the amount of exuded phenolics from phosphate-deficient roots was 5-times higher than that from the roots of control plants. The activity of L-phenylalanine ammonia-lyase was twice as high in the roots of phosphate-starved plants. Comparable rates in the exudation of phenolics by bean roots observed after 18 days of culture on nitrogen-deficient or phosphate-deficient medium may suggest a similar system of signal transduction for phenolics release. The results are discussed in relation to the possible functions of phenolics in nutrient uptake and as chemical signals in root-soil microbe interactions to enhance the plant adaptation to particular environmental conditions.Abbreviations: PAL-L-phenylalanine ammonia-lyase; P-phosphorus; Pi-inorganic phosphate; ROS-reactive oxygen species.

Biotic and Abiotic Factors Affecting the Content of the Chosen Antioxidant Compounds in Vegetables

“…This is confirmed in the research with bean plants by Jaszczuk et al (2004). In the bean plant with the deficit of phosphorus, the intensity of photorespiration increases, as does the level of glycolic acid.…”

Anthocyanins, thiols, and antioxidant scavenging enzymes are involved in Lemna gibba tolerance to arsenic

“…Anthocyanin is a secondary metabolite that can be produced in response to oxidative stress, performing important protection roles (Juszczuk et al 2004). Anthocyanin accumulation is a common response of various plant species subjected to different stresses (Valko et al 2006), and its increase in L. gibba after As exposure can aid in oxidative stress protection (Rice-Evans et al 1997).…”

Influence of Soil Traits on Polyphenols Level in Moltkia petraea (Tratt.) Griseb. (Boraginaceae)

“…These results are in line with results of Gerschenzon (1983) who found that soil defi ciencies in phosphorus, sulphur, iron, calcium, and magnesium stimulates the production of phenolic compounds in plant tissues. Higher phenolic contents have also been reported as a response to phosphate starvation in Phaseolus vulgaris L. (Juszczuk et al 2004). According to Tavarini et al (2015) nitrogen fertilization of soil in the amount of 150 kg per ha will optimize the content of total phenols and fl avonoids in leaves of Stevia rebaudiana Bertoloni (Asteraceae).…”