Effects of elevated atmospheric CO₂ on rhizosphere microbial community of Pinus densiflora (Korean red pine)

Abstract

The concentration of atmospheric CO 2 is increasing largely owing to human activities. Although it is well established that elevated CO 2 (eCO 2 ) stimulates plant growth and primary productivity, the effect of eCO 2 on soil microbial communities remains poorly understood. In this study, we aimed to examine the effects of eCO 2 on the taxonomical diversity, composition, and structure of rhizosphere microbial communities of Korean red pine (Pinus densiflora) through next-generation sequencing (NGS) of 16S rRNA genes. Three bacterial phyla, Proteobacteria, Acidobacteria, and Actinobacteria, were found to be dominant in all samples. Species richness estimates (Chao1 and ACE) and diversity indices (Shannon and Simpson) for the three sampling chambers were the highest from the eCO 2 (approximately 1.4Â ambient, % 560 ppm). These findings suggested that elevated atmospheric CO 2 affected the bacterial community composition in the rhizosphere of Korean red pine (Pinus densiflora).

Short-term severe drought influences root volatile biosynthesis in eastern white pine (Pinus strobus L)

“…Pine trees are very important as they represent one of the dominant species of global forests as they provide food and cover for small animals and birds. Studies on several pine species have revealed the vulnerability of these species to abiotic stress, especially drought stress (Mitchell et al, 2013;Quan and Ding, 2017;Asbjornsen et al, 2021;Lee et al, 2021b). However, Korean pine species show seasonal variations in their drought response (Song et al, 2020;Lee et al, 2021a).…”