3 research outputs found
Isolation and characterisation of plant growth-promoting bacterial and fungal endophytes from Himalayan Yew (Taxus wallichiana) - an economically imperative pant of Himalayas
It is a known fact that the bacterial and fungal endophytes inhabit the plant tissues besides aiding in the better
growth and health of the plants. The bark and leaves of Taxus wallichiana have drawn a lot of interest in recent years
since they are the richest source of taxol, an anticancer drug. As it is a slow-growing tree that can only be regenerated
via vegetative propagation, it has been classified as a critical rare species due to its extensive collection for medicinal
and other purposes. Nonetheless, the use of endophytes as plant growth promoters is gaining much importance among
environmentalists and agronomists because of their imperative role in crop production. Even then, there is hardly any
information available regarding the growth-promoting endophytes isolated from bark and leaves associated with T.
wallichiana commonly known as Himalayan Yew. Therefore, the present study was undertaken to isolate fungal and
bacterial endophytes from T. wallichiana and to classify the growth-promoting properties of these endophytes. In total,
seven fungal and ten bacterial endophytes were obtained from different parts of T. wallichiana. All of the isolated fungal
and bacterial endophytes produced indole acetic acid while most of them also produced ammonia. Besides, the fungal
and bacterial endophytes were also screened for antimicrobial and various enzymatic activities. Based on the above
results, the two fungal endophytes were selected for their possible ability to promote seed growth. The results showed
that the fungal endophytes isolated from T. wallichiana played an active role in increasing growth in other plant species
and therefore, can be used as potential plant growth promoters
Microbes mediated induced systemic response in plants: A review
Biotic stress affects economically important crop species and leads to quality and yield losses. Plants exhibit the ability of responding to the pathogen attack by synthesizing compounds which leads to either the inhibition or reduction of disease incidence. Plants live in close association with microbial communities. Microbes and their metabolites impact the health of the plants by supplying mineral nutrients, hormonal modulation and protection from the pathogenic organisms. Induced systemic response is one of the major mechanisms employed by the microbes in biocontrol. Beneficial microbes release certain compounds as elicitors in the rhizospheric region which are perceived by the plant roots as signals that increase the defense and resistance of the plants against the phytopathogens. The phytohormones such as ethylene, jasmonic acid, and salicylic acid are involved in regulation of the induced defense responses. The present review highlights the negative impact of the biotic stress on the plants and how induced systemic response is induced in the plants further discussing the role of the microbial elicitors in induced systemic response, their molecular mechanisms and hormonal regulation and draws the attention of the scientific community to explore new microbial elicitors as disease control alternatives