Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “PLANTS”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 793 records · Page 44Linked to original sources
PubMed2002

Potato-associated bacteria and their antagonistic potential towards plant-pathogenic fungi and the plant-parasitic nematode Meloidogyne incognita (Kofoid & White) Chitwood.

To study the effect of microenvironments on potato-associated bacteria, the abundance and diversity of bacteria isolated from the rhizosphere, phyllosphere, endorhiza, and endosphere of field grown potato was analyzed. Culturable bacteria were obtained after plating on R2A medium. The endophytic populations averaged 10(3) and 10(5) CFU/g (fresh wt.) for the endosphere and endorhiza. respectively, which were lower than those for the ectophytic microenvironments, with 10(5) and 10(7) CFU/g (fresh wt.) for the phyllosphere and rhizosphere, respectively. The composition and richness of bacterial species was microenvironment-dependent. The occurrence and diversity of potato-associated bacteria was additionally monitored by a cultivation-independent approach using terminal restriction fragment length polymorphism analysis of 16S rDNA. The patterns obtained revealed a high heterogeneity of community composition and suggested the existence of microenvironment-specific communities. In an approach to measure the antagonistic potential of potato-associated bacteria, a total of 440 bacteria was screened by dual testing for in vitro antagonism towards the soilborne pathogens Verticillium dahliae and Rhizoctonia solani. The proportion of isolates with antagonistic activity was highest for the rhizosphere (10%), followed by the endorhiza (9%), phyllosphere (6%), and endosphere (5%). All 33 fungal antagonists were characterized by testing their in vitro antagonistic mechanisms, including their glucanolytic, chitinolytic, pectinolytic, cellulolytic, and proteolytic activity, and by their BOX-PCR fingerprints. In addition, they were screened for their biocontrol activity against Meloidogyne incognita. Overall, nine isolates belonging to Pseudomonas and Streptomyces species were found to control both fungal pathogens and M. incognita and were therefore considered as promising biological control agents.

Animals↗
PubMed2002

[Variability of life cycle traits in Iris pumila juvenile plants: plant shoots and roots dynamics].

In this study I analyzed dynamic of ramet number on 18 half-sib and 63 full-sib families of rhizomatous perennial herb Iris pumila originating from two Deliblato Sand populations and grown in two nutrient levels (full strength and 1/10 of full strength Hoagland solution). Contrary to most studies dealing with response to different nutrient availability, I failed to detect significant mean nutrient level effect on dynamic of module emergence. Such absence of consistent response to tenfold variation in solution strength indicate that I. pumila have low saturation rates of nutrient uptake and presumably experienced both utilized nutrition levels as rich ones. Genetic variability for plastic response was lacking either. On the other hand, presence of between-population differentiation for the trait itself indicates that I. pumila harbors considerable amounts of within-species genetic variability for ramet dynamics.

Crosses, Genetic↗