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. Author manuscript; available in PMC: 2008 Oct 7.
Published in final edited form as: New Phytol. 2006;170(3):615–629. doi: 10.1111/j.1469-8137.2006.01687.x

Table 7.

Product-moment correlations among leaf contents of sodium, potassium and calcium (a) and between these leaf ion contents and plant biomass (b) in a salt tolerance experiment with the hybrid species Helianthus paradoxus and its progenitors Helianthus annuus and Helianthus petiolaris

H. annuus
H. paradoxus
H. petiolaris
r P r P r P
(a) Leaf ion contents (mmol g−1 DW)
Nonsaline
 Na–K 0.2580 0.1850 0.0259 0.8925 −0.2965 0.1116
 Na–Ca −0.0050 0.9797 −0.0971 0.6096 0.1297 0.4946
 K–Ca −0.1922 0.3273 −0.4215 0.0204 −0.1088 0.5669
Field-like
 Na–K −0.2795 0.1347 −0.5865 0.0007 −0.6658 < 0.001
 Na–Ca 0.1398 0.4611 −0.0904 0.6346 −0.3687 0.0535
 K–Ca −0.7759 < 0.001 0.1088 0.5673 0.0685 0.7291
K addition
 Na–K −0.5244 0.0042 −0.6498 0.0002 −0.2780 0.1690
 Na–Ca −0.3060 0.1132 −0.2549 0.1905 −0.3970 0.0446
 K–Ca −0.3060 0.1132 0.1273 0.5186 −0.2279 0.2628
Ca & Mg reduction
 Na–K −0.2369 0.2160 −0.6817 < 0.001 −0.4913 0.0058
 Na–Ca 0.0573 0.7678 0.0068 0.9719 −0.3431 0.0634
 K–Ca −0.4243 0.0218 0.0046 0.9811 0.0356 0.8518
(b) Leaf ion contents and total plant biomass
Nonsaline
 Na 0.2728 0.1601 −0.0309 0.8712 0.0928 0.6257
 K −0.1339 0.4970 0.1582 0.4039 −0.2598 0.1656
 Ca −0.2313 0.2364 −0.2472 0.1878 −0.2758 0.1402
Field-like
 Na −0.0727 0.7026 −0.4761 0.0078 −0.6035 < 0.001
 K −0.4304 0.0176 0.6653 < 0.001 0.3911 0.0396
 Ca 0.3999 0.0286 0.5778 < 0.001 0.4996 0.0068
K addition
 Na 0.0622 0.7533 −0.4540 0.0152 −0.3102 0.1230
 K −0.2094 0.2850 0.3922 0.0390 −0.1705 0.4049
 Ca 0.6022 < 0.001 0.2174 0.0999 0.5162 0.0069
Ca & Mg reduction
 Na −0.2536 0.1843 −0.4096 0.0273 0.2518 0.1794
 K 0.1893 0.3254 0.2007 0.3966 −0.0521 0.7845
 Ca −0.1038 0.5922 0.4987 0.0059 −0.1359 0.4740

The number of replicates for nonsaline, field-like, K addition and Ca & Mg reduction treatments, respectively, was 28, 30, 28 and 29 for H. annuus, 30, 30, 28 and 28 for H. paradoxus and 30, 28, 26 and 30 for H. petiolaris. Correlation coefficients (r) and P-values are given. Coefficients that were significant after correction for false discovery rate at α < 0.05 are indicated in bold type.