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. 2016 Aug 9;11(8):e0160647. doi: 10.1371/journal.pone.0160647

Table 5. Estimates of the specific and general combining ability (SCA and CGA, respectively) for root and shoot morphological attributes, used in the analysis of contrasting cacao genotypes for drought, submitted for 60 days to two water conditions (SI): control (ΨWL between -0.1 and -0.5 MPa) and stressed (ΨWLbetween -2.0 and -2.5 MPa).

Ilhéus, Bahia, Brazil.

Source of Variation DF Mean Squares
H CD TLA LN ILA LDB SDB TDB LAR SLA LMR RDB R/S RL RA RD RV RD < 1 1< RD < 2 RD > 2
(m) (cm) (m2) (unit.) m2.plant-1 g.plant-1 g.plant-1 g.plant-1 (m2. g-1) (m2. g-1) (g/g) g.plant-1 cm cm2 mm cm3 mm mm mm
PROG 20 0.3*** 36.4*** 25922308.5*** 1241.2*** 7094.0*** 1124.2*** 2033.8*** 7787.9*** 609.7*** 2438.6*** 0.1*** 311.1*** 0.1*** 2740921.0*** 662209.0*** 0.8*** 41602.0*** 316373.0** 229150.0*** 505578.0***
CGA 6 8.2*** 54.3*** 50184884.7** 3153.9*** 12650.9** 2051.8*** 3832.6*** 12940.5*** 373.6ns 4500.3*** 0.1* 326.2*** 0.2*** 4656275.0*** 999515.0*** 0.9** 67516.0*** 360036.0** 245226.0* 523232.0**
SCA 14 0.9** 2878.0** 15524061.1ns 421.4** 4711.8** 726.7*** 1262.9** 5581.1** 711.0 *** 1555.1** 0.1*** 304.7*** 0.0ns 1920055.0* 517649.0** 0.7** 30497.0** 297660.0* 222260.0** 498013.0**
SI 1 0.5** 134.6*** 73566219.1*** 1472.5*** 145.37ns 10764.0** 23.4ns 13792.4** 1517*** 13793.3*** 0.2*** 75.2ns 0.1*** 1296967.0ns 5775153.0*** 37.2*** 1050501.0*** 4960373.0*** 108150.0ns 12021085.0***
PROG x SI 20 0.1** 19.3* 25771937.7** 152.0ns 3476.0** 417.1** 821.6** 2550.4* 434.9** 1552.6*** 0.1ns 163.2** 0.1** 2026416.0** 234308.0** 0.6** 25034.0** 325898.0** 310693.0*** 315837.0*
CGA x SI 6 0.1ns 10.5ns 23284304.3* 110.6ns 5006.3** 370.7ns 933.5** 1913.5ns 233.8ns 1792.7** 0.1ns 126.2ns 0.0ns 2492091.0* 312912.0* 0.7* 44276.0*** 199644.0ns 120041.0ns 280235.0ns
SCA x SI 14 0.1** 23.0* 26838066.3 ** 170.5ns 2820.6* 436.9 ** 774.9*** 2823.3 * 521.1** 1449.8** 0.1ns 179.1** 0.0*** 1826840.0* 200620.0* 0.5* 16787.0ns 380006.0** 392401.0*** 331094.0*
Residual 248 0.0 10.9 10427373.0 115.0 1621.5 181.1 353.1 1522.0 219.5 569.4 0.1 72.4 0.0 884697.0 116302.5 0.2 10905.1 142165.0 95446.1 180697.0

H, high; CD stem diameter; TLA, total leaf area; NL, leaves number; ILA, individual leaf area; LDB, leaf dry biomass; SDB, stem dry biomass; TDB, total dry biomass; LAR, leaf area ratio; SLA, specific leaf area; LMR, leaf mass ratio; RDB, root dry weight; R/S, root/shoot ratio; RL, root length; RA, root area; RD, average root diameter; RV, root volume; RD, fine root diameter (RD < 1 mm), medium (1 < RD < 2 mm) and coarse (< 2 mm).

*** significance by F test at p < 0.001

** p < 0.01

* p < 0.05.