According to genetic analysis on 6 traits of 4-year-old Casuarina glauca in provenance trial which established in Lin'gao County, Hainan Province, there were significantly differences among height (H), diameter at breast height (DBH), individual volume (VOL), stem straightness(SS) and survival percentage (SP) (pppC. glauca provenances. The genetic correlation among the three growth characteristics, H, DBH and VOL was highly significant, but not among quality traits, SA, SS and SP, which showed that the three quality traits were independent from each other. In another aspect, the coefficient of variation varied from 31.5% (survival percentage) to 91.8% (height). Additionally, the mean genetic gains in the five traits were 2.1%, 1.4%, 2.2%, 0.2%, 0.2% and 6.2% respectively. By means of Smith-Hazel Index Selection and 20% selective ratio, five seedlots, G03, G02, G19, G07 and G25 were screened out as superior provenances for further tree breeding research.
9 mycorrhizal fungi, including 4 ectomycorrhizal fungi (ECMF) and 5 arbuscular mycorrhizal fungi (AMF), were used to explore their effect on seedling growth of Mytilaria laosensis. The study shows that M. laosensis is one of the species with both VAM and ECM. Mycorrhizal infection rate of all ECM inoculation methods reached level 3, and that of AMF infection rate was 88%-93%, of which AM91 became the highest. In different periods, different inoculation treatment expressed different effects on seedling growth. At the end of the experiment, the height, ground diameter, underground dry mass and upper ground dry mass of seedling inoculated with PX0801 and 9006 respectively increased by 71%, 45%, 128%, 184%, and 65%, 54%,150%, 208%, which exhibited the best overall effect. Coinoculated seedlings with AM90036, AM3008 and AM91 had advantages over uninoculated ones in all the tested growth indicators, which suggest to significantly promote the growth of M.laosensis. The results obtained provide reference for mycorrhizal fungi application on M. laosensis.