scholarly journals Quality and Cell Wall Components of `Anna' and `Granny Smith' Apples Treated with Heat, Calcium, and Ethylene

1990 ◽  
Vol 115 (6) ◽  
pp. 954-958 ◽  
Author(s):  
Joshua D. Klein ◽  
Susan Lurie ◽  
Ruth Ben-Arie

`Anna' and `Granny Smith' apples (Malus domestics Borkh.) that were held at 38C for 4 days before storage at 0C not only were firmer than controls upon removal from storage, but also softened more slowly during shelf life at 17C. Skin yellowing and loss of acidity attendant upon the heat treatment were not prevented by dipping fruit in 2% CaCl2 before heating. Both heat-treated and control fruit softened at the same rate upon exposure to ethylene at 100 μl·liter-1 upon removal from storage. The insoluble pectin content of cortical tissues was higher in heat-treated fruit than in controls after 10 days at 17C, while soluble pectin levels were lower. Arabinose and xylose levels were lower in cell walls from heat-treated cortical tissue, but the treatment had no effect on loss of galactose residues during shelf life.

Author(s):  
Alberto García-Iruela ◽  
Luis García Esteban ◽  
Francisco García Fernández ◽  
Paloma de Palacios ◽  
Alejandro B. Rodriguez-Navarro ◽  
...  

Author(s):  
WILLIAM S. YORK ◽  
ALAN G. DARVILL ◽  
MICHAEL MCNEIL ◽  
THOMAS T. STEVENSON ◽  
PETER ALBERSHEIM

Author(s):  
William S. York ◽  
Alan G. Darvill ◽  
Michael McNeil ◽  
Thomas T. Stevenson ◽  
Peter Albersheim

IAWA Journal ◽  
2019 ◽  
Vol 40 (4) ◽  
pp. 845-870 ◽  
Author(s):  
Adya P. Singh ◽  
Yoon Soo Kim ◽  
Ramesh R. Chavan

ABSTRACT This review presents information on the relationship of ultrastructure and composition of wood cell walls, in order to understand how wood degrading bacteria utilise cell wall components for their nutrition. A brief outline of the structure and composition of plant cell walls and the degradation patterns associated with bacterial degradation of wood cell walls precedes the description of the relationship of cell wall micro- and ultrastructure to bacterial degradation of the cell wall. The main topics covered are cell wall structure and composition, patterns of cell wall degradation by erosion and tunnelling bacteria, and the relationship of cell wall ultrastructure and composition to wood degradation by erosion and tunnelling bacteria. Finally, pertinent information from select recent studies employing molecular approaches to identify bacteria which can degrade lignin and other wood cell wall components is presented, and prospects for future investigations on wood degrading bacteria are explored.


2020 ◽  
Author(s):  
Ana López-Malvar ◽  
Rosa Ana Malvar ◽  
Xose Carlos Souto ◽  
Leonardo Dario Gomez ◽  
Rachael Simister ◽  
...  

Abstract Background: Besides the use of maize grain as food and feed, maize stover can be a profitable by-product for cellulosic ethanol production, whereas the whole plant can be used in silage production. However, yield is reduced by pest damages, where stem corn borers are one of the most important factors limiting yield. Overall, cell wall composition is key in determining the quality of maize biomass, as well as pest resistance. This study aims to address the interrelations between cell wall components in diverse maize genotypes, and pest resistance, ethanolic production and forage digestibility. Results: We can highlight the following results: (i) pests resistant inbred lines may show cell walls with low p-coumaric acid and hemicellulose content; (ii) inbred lines showing cell walls with high cellulose content and diferulate cross-linking may present higher performance in ethanol production; (iii) and inbred lines with enhanced digestibility may have cell walls poor in neutral detergent fibre and diferulates, combined with a lignin polymer composition richer in G subunits. Conclusions: Our results evidence that there is no maize cell wall ideotype among the tested for optimal performance in the three areas evaluated, and maize plants should be specifically bred for each particular application.


Holzforschung ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiaoshuang Shen ◽  
Dengkang Guo ◽  
Pan Jiang ◽  
Gaiyun Li ◽  
Sheng Yang ◽  
...  

Abstract Wood properties of furfurylation can be altered by reaction mechanisms of furfuryl alcohol polymer (PFA) and cell walls. Although chemical reactions between PFA and lignin have been studied, reaction mechanisms between PFA and cell wall components, including lignin, cellulose and hemicellulose are still not comprehensively understood. In order to elucidate chemical reactions regarding PFA with wood cell walls, model compounds of main cell wall components were used to investigate its reactions with PFA by 13C NMR spectroscopy and differential scanning calorimetry (DSC). Results showed that there was no chemical bonding of PFA with either cellulose or hemicellulose. Condensations of uncrowded ring positions (meta, ortho and para) and side chains (α–C, β–C, β–OH, and γ–OH) of lignin with PFA did occur based on 13C NMR spectra. Reaction enthalpy and activation energy also confirmed the condensation reactions between lignin and PFA. This study could provide design guidelines to control the chemical reactions of PFA in cell walls and lignin and, therefore, improve the properties of furfurylated wood.


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