Plant Growth Promoting Actinobacteria, the Most Promising Candidates as Bioinoculants?

Abstract

Plant Growth Promoting Bacteria (PGPBs) are a strong ally for sustainable agriculture. They offer an interesting alternative to chemical fertilizers and pesticides. Many microorganisms have been widely documented for their PGPR traits, but actinobacterial microbes which have been increasingly documented only these two past decades for their ability to promote plant growth. Their action on plant health and yield could be either direct, indirect or both. This review will cover articles that have been published on Actinobacteria PGP traits, highlighting the involved mechanisms to reveal their strong potential as microbial fertilizers. Possible strategies to encourage Actinobacteria use as bioinoculants are also discussed.

Biocontrol of Cercospora Leaf Spot Disease and Enhancement of Defense Response in Vigna radiata (L.) R. Wilczek (Mung Bean) Plants Using Bioformulation of Endophytic Streptomyces sp

“…31 Excessive inputs of pesticides, fungicides, and chemical fertilizers could result in maximum yield for a while, but applications of these agrochemicals eradicate the beneficial microbial diversity and result in chemically contaminated soil and negative effects for the environment and humans. 32 Mung bean is the most promising source of the protein, which fulfill the protein requirement in humans. In crop production, mung bean faces several challenges due to the aggressive fungal diseases (Cercospora, anthracnose, Fusarium wilt, and powdery mildew) that result in maximum loss of the yield and impact on economic circumstances.…”

“…The soil and plant health is intimately linked with the diversity of microbes for the turnover of nutrients and survival fitness in stressful environments . Excessive inputs of pesticides, fungicides, and chemical fertilizers could result in maximum yield for a while, but applications of these agrochemicals eradicate the beneficial microbial diversity and result in chemically contaminated soil and negative effects for the environment and humans . Mung bean is the most promising source of the protein, which fulfill the protein requirement in humans.…”

Plant–soil feedbacks among boreal forest species

“…In this study, Scots pine grew best in soil with birch inoculum. Pine seedling growth correlated with the abundance of EMF, which associate with plant roots to form symbioses that provide nitrogen and phosphorus to the plant, thereby facilitating growth (Anderson & Cairney, 2007; Boukhatem et al., 2022). Pine seedlings growing on birch soil were able to recruit specific EMF and root‐associated fungi that correlated positively with growth, which suggests that soil microorganisms might be aiding pine establishment in birch‐conditioned areas.…”

Mechanistic insights into the role of actinobacteria as potential biocontrol candidates against fungal phytopathogens

“…In addition to pharmaceutical industry, they have long gained significance in the agro-industry, as unparalleled sources of antifungal compounds (effective against fungal phytopathogens), cell wall degrading enzymes, plant growth regulators, antiparasitic agents and insecticidal agents are conducive in crop production [11,[21][22][23]. Therefore, these bacteria constitute the potential to be used as biocontrol agents by suppressing the growth and development of a wide range of plant pathogens, thereby considered as potent plant growth promoting agents [24][25][26][27][28]. Thus, actinobacteria posses several applications in agro-industry on the basis of different mechanisms, which are described in greater detail in the following sections.…”