2,6-dichloroisonicotinic acid Allium and X-ray microscopy Biology, life sciences Botrytis cinerea Colletotrichum higginsianum INA Physcomitrella Pseudomonas Research & information: general abiotic stress bean boron calcium cell wall cell wall polysaccharides dehydration disease resistance environmental stress expansins homogalacturonan hydroxycinnamyl alcohols pectin peroxidase plant cell wall composition plant defense plant development plant evolution rhamnogalacturonan II salt stress water stress