Chapter 10
Endophytic Actinobacteria Associated
with Mycorrhizal Spores and Their
Benefits to Plant Growth
Krisana Lasudee, Pharada Rangseekaew, and Wasu Pathom-aree
Abstract Actinobacteria are a large group of Gram-positive bacteria with a unique
high G + C content(%) in their genome. They are best known as major producers
of bioactive compounds in particular secondary metabolites. Arbuscular mycorrhiza
or endomycorrhiza are the most common symbionts between plant roots and fungi
with long historical practices in agriculture. Recently, it has become apparent that
there are actinobacteria live in association with arbuscular mycorrhizal spores as
“endophytes.” This special niche harbors diverse actinobacterial taxa with potential
in the production of plant growth-promoting substances. The application of some of
these actinobacteria exhibited growth enhancement in several plant species including
those grown under abiotic and biotic stresses. Plant growth-promoting properties are
common within members of actinobacteria occurring endophytically in mycorrhizal
spores. A study of Streptomyces from Funneliformis mosseae spores to alleviate
adverse effects of drought on Thai jasmine rice KDML105 is a neat evidence of
its potential to promote plant growth sustainably. The diversity of endophytic actinobacteria from mycorrhizal spores and their possible application in agriculture as
plant growth promoters are the main focus of this chapter.
Keywords Actinobacteria · Mycorrhizal spores · Endophyte · Plant
Growth-Promoting rhizobacteria · Drought
10.1 Introduction
Actinobacteria are a large group of Gram-positive mostly filamentous bacteria with
the characteristic of their high G+C content (%) in their DNA. Based on their genome
K. Lasudee · P. Rangseekaew · W. Pathom-aree
Microbiology Section, Department of Biology, Faculty of Science, Chiang Mai University,
Chiang Mai 50200, Thailand
W. Pathom-aree (B)
Research Center of Microbial Diversity and Sustainable Utilization, Department of Biology,
Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
e-mail: wasu.p@cmu.ac.th
© Springer Nature Switzerland AG 2021
D. K. Maheshwari and S. Dheeman (eds.), Endophytes: Mineral Nutrient
Management, Volume 3, Sustainable Development and Biodiversity 26,
https://doi.org/10.1007/978-3-030-65447-4_10
229
Endophytic Actinobacteria Associated
with Mycorrhizal Spores and Their
Benefits to Plant Growth
Krisana Lasudee, Pharada Rangseekaew, and Wasu Pathom-aree
Abstract Actinobacteria are a large group of Gram-positive bacteria with a unique
high G + C content(%) in their genome. They are best known as major producers
of bioactive compounds in particular secondary metabolites. Arbuscular mycorrhiza
or endomycorrhiza are the most common symbionts between plant roots and fungi
with long historical practices in agriculture. Recently, it has become apparent that
there are actinobacteria live in association with arbuscular mycorrhizal spores as
“endophytes.” This special niche harbors diverse actinobacterial taxa with potential
in the production of plant growth-promoting substances. The application of some of
these actinobacteria exhibited growth enhancement in several plant species including
those grown under abiotic and biotic stresses. Plant growth-promoting properties are
common within members of actinobacteria occurring endophytically in mycorrhizal
spores. A study of Streptomyces from Funneliformis mosseae spores to alleviate
adverse effects of drought on Thai jasmine rice KDML105 is a neat evidence of
its potential to promote plant growth sustainably. The diversity of endophytic actinobacteria from mycorrhizal spores and their possible application in agriculture as
plant growth promoters are the main focus of this chapter.
Keywords Actinobacteria · Mycorrhizal spores · Endophyte · Plant
Growth-Promoting rhizobacteria · Drought
10.1 Introduction
Actinobacteria are a large group of Gram-positive mostly filamentous bacteria with
the characteristic of their high G+C content (%) in their DNA. Based on their genome
K. Lasudee · P. Rangseekaew · W. Pathom-aree
Microbiology Section, Department of Biology, Faculty of Science, Chiang Mai University,
Chiang Mai 50200, Thailand
W. Pathom-aree (B)
Research Center of Microbial Diversity and Sustainable Utilization, Department of Biology,
Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
e-mail: wasu.p@cmu.ac.th
© Springer Nature Switzerland AG 2021
D. K. Maheshwari and S. Dheeman (eds.), Endophytes: Mineral Nutrient
Management, Volume 3, Sustainable Development and Biodiversity 26,
https://doi.org/10.1007/978-3-030-65447-4_10
229