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. 2019 Apr 9;10:445. doi: 10.3389/fpls.2019.00445

Table 1.

Pearson’s correlation coefficients between photosynthetic and root activity indexes during the reproductive stages of 2014 and 2015.

Year of 2014
 Year of 2015
R2
 R5
 R6
 R2
 R5
 R6
RA RBSM RA RBSM RA RBSM RA RBSM RA RBSM RA RBSM
D/D PN   0.33 NS   0.34NS   0.09NS   0.08NS   0.54 **   0.51 **   0.02NS –0.05NS –0.02NS –0.03NS   0.41 *   0.44 *
gs –0.13NS –0.29NS –0.01NS –0.17NS   0.60 **   0.64 **   0.31NS –0.19NS –0.09NS –0.20NS   0.26NS   0.28NS
E   0.02NS –0.08NS   0.29NS   0.16NS   0.17NS   0.19NS   0.11NS –0.09NS   0.31NS   0.18NS   0.04NS   0.02NS
Leaf greenness   0.30NS   0.35 * –0.10NS –0.12NS –0.06NS –0.10NS   0.24NS –0.15NS –0.22NS –0.16NS   0.09NS   0.07NS
L/D PN   0.18NS –0.19NS   0.09NS   0.16NS   0.75 **   0.70 **   0.35 *   0.05NS   0.06NS –0.08NS   0.66 **   0.58 **
gs –0.09NS   0.19NS –0.22NS –0.29NS   0.73 **   0.74 **   0.13NS   0.26NS –0.25NS –0.32NS   0.57 **   0.60 **
E –0.11NS   0.14NS   0.184NS –0.01NS   0.53 **   0.56 **   0.15NS   0.43 *   0.15NS   0.02NS   0.59 **   0.60 **
Leaf greenness   0.21NS –0.29NS   0.15NS   0.22NS   0.29NS   0.16NS   0.29NS   0.08NS   0.28NS   0.16NS   0.02NS –0.11NS
Z/D PN –0.00NS   0.07NS –0.30NS –0.44 *   0.88 **   0.83 **   0.74 **   0.53 **   0.53 **   0.61 **   0.69 **   0.58 **
gs –0.17NS –0.57 ** –0.17NS –0.14NS   0.37 *   0.49 **   0.44 *   0.09NS   0.02NS   0.00NS   0.43 *   0.39 *
E –0.35 * –0.39 *   0.03 NS   0.06NS   0.57 **   0.56 **   0.40 * –0.01NS   0.49 **   0.47 **   0.56 **   0.42 *
Leaf greenness –0.19NS –0.03NS –0.11NS –0.10NS   0.13NS   0.09NS   0.53 **   0.60 **   0.41 *   0.60 **   0.07NS   0.03NS
D/L PN –0.09NS –0.16NS   0.06NS   0.00NS   0.81 **   0.83 **   0.26NS   0.23NS –0.13NS –0.12NS   0.74 **   0.71**
gs –0.08NS –0.29 NS –0.16NS –0.17NS   0.63 **   0.71** –0.00 NS –0.16NS   0.07NS   0.00NS   0.63 **   0.63 **
E –0.35 * –0.42 * –0.03NS –0.08NS   0.43 *   0.46 ** –0.21NS –0.24NS   0.03NS   0.12NS   0.71 **   0.74 **
Leaf greenness   0.09NS –0.02NS –0.079NS –0.19NS   0.23 NS   0.27NS   0.16NS   0.07NS   0.03NS   0.12NS   0.04NS –0.02NS
D/Z PN   0.17NS   0.35 * –0.18NS –0.18NS   0.86 **   0.89 **   0.23NS   0.46 ** –0.22NS –0.14NS   0.78 **   0.75 **
gs –0.10 NS   0.19NS –0.22NS –0.29NS   0.17NS   0.33NS –0.00NS   0.30NS –0.28NS –0.25NS   0.37 *   0.38 *
E –0.15NS –0.02NS   0.22NS   0.10NS   0.63 **   0.63 ** –0.04NS   0.15 NS   0.02NS –0.00NS   0.62 **   0.56 **
Leaf greenness   0.12NS   0.36 *   0.09NS   0.13NS   0.12NS   0.13NS   0.01NS   0.26NS   0.02NS   0.07NS   0.15NS   0.14NS

R2, the flowering stage; R5, early grain-filing stage; R6, late grain-filling stage. D, mean of eleven common cultivars; D/D, self-grafts; L/D or Z/D, grafts with L14/Z35 scions; D/L or D/Z, grafts with L14/Z35 rootstocks. PN, net photosynthetic rate; gs, stomatal conductance; E, transpiration rate. RA, root activity; RBSM, root bleeding sap mass. The bolded values highlighted the significant correlations of PN with RA and RBSM, respectively under different grafting combinations at R6 stage. *P < 0.05, **P < 0.01, NS, not significant.