SRP survival rate
The treatments that effectively promoted the growth of SRPs also
contributed to the survival rate of the transplanted plants. For
example, the SRPs treated with 20 g/L sucrose obtained the highest
survival rate (85.2 %). Similarly, following the liquid medium and
transplantation stroma treatments, the highest survival rate was
obtained in the 1/2 WPM and mixture of vermiculite and perlite (1:1
(v/v)). Thus, the optimal
enhancement
for P. thunbergii SRPs was 20 g/L sucrose, 1/2 WPM liquid
medium,
and a transplantation stroma of vermiculite and perlite (1:1 (v/v)).
Among the spectral treatments, the highest survival rate occurred under
the 8R2B, while the lowest survival rate was under the B treatment.
Furthermore, the survival rate of SRPs was significantly promoted in the
rooting medium with 1 µg/L BR (Fig. 5). As for the ratio of roots to
shoots (R/S), the results revealed that when the ratio of roots to
shoots < 4cm, there was no relationship with survival rate.
When the ratio of roots to shoots > 4cm, it was positively
related to survival rate (Fig. 6). Among all treatments, those under the
light spectrum had the highest survival rate. Thus, based on the light
spectrum treatments, principal component analysis showed that the factor
that had the greatest influence on the survival rate was the tips (Fig.
S1). Moreover, the correlation analysis also showed that the correlation
coefficient of the root tips on survival was the greatest (p< 0.001; r=0.53), while the highest correlation with the root
tips was the root volume (p < 0.001; r=0.38). The root
length had the lowest correlation coefficient (p <
0.05; r = 0.18) for the survival rate compared to the root tips, surface
area, volume, and diameter, (Fig. 7).