Excerpts

3 Result 3.1 Temporal trends in environmental factors A significant increasing trend in atmospheric CO 2 and a decreasing trend in stable carbon isotopic values of air were observed during 1980–2015.

Marker-trait associations exceeding this threshold were considered statistically highly significant.

In contrast, cluster 6 showed a trend of “increase from 0d to 7d and decrease from 7d to 28d”, reflecting a dynamic balance between metabolic activation in the early cultivation stage and metabolic inhibition in the later stage.

In-depth analysis based on the culture time-dependent variation data of secondary metabolites presented in Table 6 revealed that sesquiterpenoids (including those with agarwood-characteristic skeletons) exhibited an overall trend of “increase–decrease–recovery”.

In the phenotypic analyses of WT and idd9 ( Figure 4A ), WT has about four CRs (WT: 3.9 ± 0.34), the number of CRs in the idd9 showed an increasing trend, with idd9–1 having about six CRs ( idd9-1 : 5.8 ± 0.37) and idd9–2 having about seven ( idd9-2 : 6.2 ± 0.40).

Among the findings, fruit longitudinal diameters showed a highly significant positive correlation with fruit transverse diameters and fruit index, and a highly significant negative correlation with flesh firmness.

3.6 Analysis of correlations between carbon fractions and aggregates, enzyme activities, and their influencing factors under different treatments As shown in Figure 4 , correlation analysis revealed significant to highly significant positive correlations among soil carbon fractions.

After the individual application of biochar and green manure (T2 and T3), the soil pH, OM, TN, AP, and AK contents showed an increasing trend compared with T1.

Notably, under WNM, the LJ419 cultivar, which achieved the greatest yield increase in this study, displayed a highly significant negative correlation between yield and the number of dropped panicles.

Statistical thresholds and model selection criteria For all statistical tests, a significance level of α = 0.05 was used, with P < 0.05 considered statistically significant and P < 0.01 considered highly significant.

Although we did not detect a significant relationship between entry hole density and monoterpene concentration at the individual tree level, colonized trees exhibited a stronger induction compared to uncolonized trees (though the difference was marginally significant).

Testing fold-change during the flight period also revealed a highly significant effect, indicating that each unit increase in induction fold-change during the flight period was associated with more than a twofold increase in the odds of survival.

There was not a significant relationship between annual precipitation and mean phloem monoterpene concentrations (p-value = 0.07, Supplementary Table 3 ), though a negative trend was evident.

Meanwhile, the peak areas representing the total abundance of ( Z )-3-hexen-1-ol and hexanoic acid showed an increasing trend during the postharvest processing of oolong tea, which benefits from the sufficient supply of C6 aldehydes generated through the oxidation and cleavage of polyunsaturated fatty acids (PUFAs) by the LOX-HPL enzyme system ( Zhou et al., 2021a ).

a decreasing trend was evident as the cutting interval increased ( Table 3 ).

Results The results showed that soil respiration rate exhibits a distinct unimodal curve, reaching its maximum during the maize flowering stage, and showed a highly significant positive correlation with soil temperature.

Soil respiration exhibited distinct seasonal dynamics, with an overall trend similar to that of soil temperature.

The results revealed a clear trend, the explanatory power of the principal components increased progressively with longer supplemental lighting across the time-point groups.

The variation trends of soil organic carbon (SOC) and its labile fractions were basically consistent, exhibiting an overall trend of BOF > OF, Vm > CFR > FP.

As planting density increased, sucrose accumulation in the third internode of the stalk base showed an increasing trend, with extremely significant differences ( Figure 1E ).

The expression level of the SPS1 was elevated with advancing growth stages at density D2, while SPS2 exhibited the opposite expression pattern; IVR1 and IVR2 showed little change in expression levels at different densities as the growth stage progressed in M1, but expression levels were elevated as the growth stage progressed at density D2 in M2; and BAM1 and Sh2 showed a decreasing trend in expression levels as the growth stage progressed and the stalk gradually aged.

Under moderate and intense drought treatments, from the 1970s to the 2010s, the above-ground biomass at silking stage showed a decreasing trend, though not at a statistically significant level ( Figure 4 ).

As nitrogen application rates increased, the dry matter allocation ratio between leaves and stems showed a decreasing trend from the PSS to PBS periods, though the differences were small.

As shown in Table 6 , RS had a significant positive correlation with total P (TP), microbial biomass carbon (MBC), and soil organic matter (SOM), but a highly significant negative correlation with pH.

Under cold stress conditions, the expression levels of the five genes increased by 2 to 10 times compared to the control, with all increases being highly significant.