Contribution of K solubilising bacteria (

Abstract

K+ availability is important for growth and quality of tea (Camellia sine sis L.). K solubilising bacteria convert insoluble K to available K. This study was conducted to screen K solubilising bacteria isolated from tea rhizosphere soil in Qimen county, Anhui province, China. The maximum K solubilisation colony (the ratio of diameter halo/colony was 2.54) was identified as Burkholderia sp. (storage number: M2021105) by biochemistry and molecular analysis. Pot experiments (Laterite) showed that the inoculation of Burkholderia sp. significantly improved tea plant height (Zhongcha108, 1 year old) and total polyphenols content by 21.14% and 21.58% compared with the control, respectively. Higher polyphenol level promoted the formation of theaflavin in the fermentation experiments. Further experiments showed that tartaric acid and pryuvic acid produced by Burkholderia sp. are important components associated with K solubilisation in vitro. Burkholderia sp. significantly increased soil available K by 15.12%; however, there was no significant difference in available N and P, and Cu, Mg, Zn and Ca compared with the control. K content in inoculated tea roots and leaves was significantly higher (50% and 10%, respectively) than the control. Compared with the control, exogenous supply of 60 mg kg−1 K significantly increased levels of polyphenol (53.97%), theaflavin (16.31%), theaflavin-3-gallate (20%), theaflavin 3′-gallic acid ester (32.24%) and theaflavin 3,3′-gallic acid ester (40.95%). Due to its ability to enable higher available soil K, ur study indicated that Burkholderia sp. have potential to increase total polyphenols content be a bio-inoculant for biofortification of tea.

Effects of Potassium Deficiency on the Growth of Tea (Camelia sinensis) and Strategies for Optimizing Potassium Levels in Soil: A Critical Review

“…Given the lower content of aromatic alcohols, aldehydes, and esters and the weaker diversity of aromatics, such teas lack quality. Some scholars insist that exogenous application of potassium would influence the levels of polyphenols and theaflavins in the tea plant, which would reverse this situation [32].…”

Metabolome profiling and transcriptome analysis unveiling the crucial role of magnesium transport system for magnesium homeostasis in tea plants

“…Insufficient K could threaten the growth of the tea plant, disturb the synthesis of sugars and proteins, and affect the contents of quality components [ 18 , 19 ]. Conversely, adequate K nutrition prompted the biosynthesis of aroma components and some free amino acids, and enhanced resistance to adversity by activating different enzymes, thus promoting the yield and quality of C. sinensis [ 6 , 20 , 21 ]. Exogenous application of calcium enhanced the drought tolerance of tea plants by affecting the galactinol biosynthesis pathway and mediating the regulation of the stomatal aperture in guard cells [ 22 ], and was capable of adapting to high temperature by modulating the expression patterns of 45 key genes [ 23 ].…”

A Versatile Strategy for Concurrent Passive Daytime Radiative Cooling and Sustainable Energy Harvesting

“…[20,22] While abundant progresses have been made, developing cost-effective and simple-to-prepare radiative cooling devices with good durability and sustainable energy scavenging capability is still challenging for large-scale applications and high efficiency energy harvesting. [7,24] For instance, Song et al proposes a simple strategy to provide an anti-aging cooling paint by applying titanium dioxide (TiO 2 ) nanoparticles with hierarchical porous morphology and ultraviolet resistance, displaying a balanced anti-soiling and high solar reflectance. [7] Recently, researchers are trying to integrate PDRC film in the fabrication of thermoelectric generators, which is beneficial to transfer the waste thermal energy into electricity, demonstrating a potential way to construct a sustainable energy scavenging system.…”