B. Meena et al., Induction of pathogenesis-related proteins, phenolics and phenylalanine ammonia-lyase in groundnut by Pseudomonas fluorescens, Z PFLANZENK, 107(5), 2000, pp. 514-527
Citations number
66
Categorie Soggetti
Plant Sciences
Journal title
ZEITSCHRIFT FUR PFLANZENKRANKHEITEN UND PFLANZENSCHUTZ-JOURNAL OF PLANT DISEASES AND PROTECTION
Foliar application of a plant growth-promoting rhizobacterium, Pseudomonas
fluorescens strain Pf1 significantly controlled late leaf spot and rust dis
eases of groundnut (Arachis hypogaea L.) under greenhouse conditions. Groun
dnut plants, when sprayed with P. fluorescens strain Pf1, showed increase i
n activity of phenylalanine ammonia-lyase I day after application and the m
aximum enzyme activity was detected at 3 days after treatment. An increase
in phenolic content was observed I day after P. fluorescens treatment. Also
chitinase and beta -1,3-glucanase activities increased significantly 1 day
after P. fluorescens treatment and maximum activities were reached 4 days
later. Application of P. fluorescens to groundnut leaves induced accumulati
on of a 23-kDa thaumatin-like protein (TLP) and a 30-kDa glucanase. The ind
uction of 23-kDa TLP was detected only in treated leaves and not in roots,
stems and petioles of the groundnut plants. The 30-kDa glucanase starred to
accumulate 1 day after treatment and the Level of the protein continued to
increase throughout the experimental period of 4 days. Both TLP and glucan
ase were found in the intercellular fluid of P. fluorescens-sprayed groundn
ut leaves.