- P is the significance level of the factor (n.s.: not significant; *<0·05; **<0·01; ***<0·001). % is the percentage of variability explained by the factor. Factors that have not been considered in the model are represented with a dash (–).
- a roentgen: resistant; S: vulnerable.
- b Quantity of inoculated seedlings.
- c Mean wilting percentage ± SE.
- d Emails identity homogeneous organizations from the Fisher’s LSD attempt (P = 0·05).
Hydraulic conductivity and you can susceptability so you can cavitation
Vulnerability to cavitation (Pfifty and P80), Kxmaximum and absolute conductivity (Kx) did not differ significantly among the types of crosses (Fig. 1; Table 3). Loss of conductivity began at ?0·3 MPa and progressed at a similar rate in all crosses, i.e. there were no differences in the slope of VCs (P = 0·87; Table 3).
- a WP 20 d.a.i., wilting percentage 20 days after inoculation; VC slope, ‘a’ parameter of the exponential sigmoid: PLC = 100/(1 + exp[a(??b)]); P50, applied pressure at which the sample loses 50% hydraulic conductance; P80, applied pressure at which the sample loses 80% hydraulic conductance; Kxmax, maximum xylem specific conductivity; VLmax, maximum vessel length; bVL, vessel length distribution parameter; WD, wood density; VD, vessel diameter; VTA, vessel transectional area; THC, relative theoretical hydraulic conductance; VF, vessel frequency; (t/b) 2 , resistance to implosion; PGV, percentage of grouped vessels; VPG, vessels per group; VGA, vessel groups per area; CLVF, contribution of large vessels (VD >70 ?m) ceny lds singles to flow; CMVF, contribution of medium vessels (40 < VD < 70 ?m) to flow; CSVF, contribution of small vessels (VD <40 ?m) to flow.
- b R: resistant, S: vulnerable. Indicate value ± SE. Letters identity homogeneous groups in this an adjustable (P = 0·05, Fisher’s LSD means).
- cP-value on anova.
- *log-transformed to meet anova criteria; **inverse-transformed to get to know anova standards.
Despite P80 and Kxmax not differing between crossing types, these variables were positively correlated with WP 20 d.a.i. for the 24 selected trees (P < 0·05; Table S1). Nevertheless, the coefficient of correlation was low in both cases (R 2 < 0·20).
Maximum vessel length (VLmax) ranged from 69 to 118 mm. S ? S trees had 30–40% significantly longer conduits and a higher percentage of longer vessels (Fig. 2a; Table 3). There was a negative correlation between Kxmax (log-transformed) and bVL (R 2 = 34·5, P = 0·0026; Table S1): plants with shorter vessels had lower conductivity.
S ? S progeny showed the widest vessels (VD; Table 3), and were unique in having vessel diameters greater than 90 ?m (Fig. 2b). The progeny of the S ? S cross also had larger VTA, and a THC twice as high as the other two groups (Table 3). CLVF, CMVF and CSVF did not differ among crossing types (P > 0·05, Table 3). As expected, Kxmax (log-transformed) was positively correlated with THC (R 2 = 32·6, P = 0·0035; Table S1) and VD (R 2 = 28·8, P = 0·0068; Table S1). In addition, R ? R individuals showed a significantly higher VF (c. 20%) and a greater (t/b) 2 (P 0·05; Table 3).
Both ?pd and ?md progressively decreased after DED inoculation (Fig. 3a). Seventeen d.a.i., ?pd had dropped more than 0·25 MPa and 47 d.a.i. c. 1 MPa, independent of the type of crossing (Fig. 3a). ?md dropped from ?1 MPa to almost ?3 MPa in S ? S progeny at the end of the experiment. From the thirteenth d.a.i., ?md of R ? R cross progeny was significantly different from S ? S cross progeny.