Genotypic variations appear in fine root morphological traits of Cryptomeria japonica trees grown in a common garden

作者：Ryo Nakahata, Wakana Azuma, Tomoko Tanabe, Kiyosada Kawai, Tsutom Hiura · 发表于：Ecological Research · 年份：2024 · DOI：10.1111/1440-1703.12492 · 被引用次数：5 · 研究领域：Seedling growth and survival studies、Plant nutrient uptake and metabolism、Plant responses to water stress

Abstract Fine root morphological traits regulate the belowground resource acquisition strategies of trees. Therefore, investigating genotypic variations isolated from environmental variations within tree species helps in understanding how genotypic backgrounds affect intragenerational tree acclimation to the growing environment. Thus, this study aimed to clarify the effects of genotypic variations on the fine root morphology of three types of Japanese cedar ( Cryptomeria japonica ), which were derived from different provenances but were grown in a common garden. In the three geographically different provenances of C. japonica stands (Yanase, Yoshino, and Yaku), fine root morphological traits, such as root length and diameter and specific root length (SRL), were measured for each root up to the 4th branching order. Yaku cedar exhibited root traits distinct from the other provenances, such as growing longer and thinner roots in 1st root order to enhance root surface area. In addition, the SRL patterns with root orders and higher root tissue density suggested a resource conservation strategy. Yanase cedar demonstrated a significantly higher root branching ratio and specific root tips than the other provenances, indicating a strategy for investing resources in absorptive roots. Although Yoshino cedar had traits similar to those of Yanase cedar or intermediate between Yanase and Yaku cedars, high aboveground production may be achieved through nutrient acquisition with root exudate...