Abstract
Objectives: The objective of the present study to test the angiospermic epiphytes such as Bulbophyllum propinquum and Dendrophthoe falcata for their effect against some pathogenic fungi of sorghum, paddy and chilli, through seed treatment and foliar spray in challenging with the infectivity of the pathogens.
 Methods: The plant extracts were carried out by the Soxhlet extraction method and culture of pathogenic fungi were cultured and maintained in vitro for further use. The peroxidase (POX) enzyme activity in the seedlings was measured spectrophotometrically at 300 nm and expressed as Δ optical density 300 nm/min/mg protein.
 Results: The results of this study indicated 92 and 98% seed germination in the control samples, respectively. In the chilli and paddy which were reduced to 64 and 58% in seedlings inoculated with Colletotrichum dematium, Drechslera oryzae, correspondingly. Similar observation was made in sorghum samples on treatment with Fusarium solani and Fusarium oxysporum, whose germination was drastically reduced to 74 and 69% compared to control (92%). In all the cases, seed treated with epiphytes extracts indicated the stimulated germination over pathogen inoculated samples. In parallel to this, the peroxidase assay also indicated its diminished/reduced activity in pathogen treated seedlings of the selected crop species. Seedlings of epiphytes extract treatment challenged with respective pathogens showed an increased activity over only pathogen treated samples.
 Conclusion: The results clearly indicated the influence of POX in early growing stages of the seedlings corresponds to 12–72 h of incubation in spite of pathogenic activity. Thus, it proved the loss of enzyme activity seedlings on pathogen infection. Contrastingly, POX activity in the seedlings irrespective of the crop species remained high during the early growth stages of the seedlings.
Highlights
IntroductionMany are known for their value as medicine and food, which are necessary for our daily life
Among the plant species, many are known for their value as medicine and food, which are necessary for our daily life
Considering these aspects, in the present study, epiphytic angiosperms such as Bulbophyllum propinquum Kraenzl., and Dendrophthoe falcata (L. f.) Ettingsh have been tested for their effect against pathogenic fungi of some crop species through seed treatment and foliar spray in challenging with the infectivity of the pathogens
Summary
Many are known for their value as medicine and food, which are necessary for our daily life. Some of the active compounds from plants are responsible for the elicitation of systemic acquired resistance, or the resistance may occur as a result of change in the morphological barriers in the host cells, or they may act as stimulators of defense enzymes in response to biological stress. Considering these aspects, in the present study, epiphytic angiosperms such as Bulbophyllum propinquum Kraenzl., and Dendrophthoe falcata (L. f.) Ettingsh have been tested for their effect against pathogenic fungi of some crop species through seed treatment and foliar spray in challenging with the infectivity of the pathogens
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