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. 2017 Jul 25;12(7):e0181541. doi: 10.1371/journal.pone.0181541

Table 7. Summary mean squares and significance tests of combining ability effects for yield and growth traits under water stress conditions on potato families tested in set I and set II at Adet, Ethiopia.

Source of variation d.f. TTY MTY ATW GC PHT CC
Set I
Replication 1 0.0042ns 0.0070ns 86.81*** 1.334ns 100.77* 5.23ns
GCAf 3 0.0186*** 0.0154*** 95.86*** 103.679ns 228.16*** 0.71ns
GCAm 3 0.0135** 0.0218*** 114.11*** 70.696ns 129.11*** 23.15***
SCA 9 0.0084** 0.0110*** 102.39*** 88.735ns 36.26* 8.15**
Error 15 0.0017 0.0017 2.15 35.778 12.13 1.53
CV (%) 11.778 13.5466 6.39 13.612 7.9 2.81
Mean 0.3495 0.3006 22.95 43.941 44.07 44.01
R2 0.8739 0.8972 0.98 0.711 0.89 0.87
GCA/(GCA+SCA)% 65.5515 62.8355 50.63 49.56 83.12 59.4
GCAf/GCAm ratio 1.3768 0.7059 0.84 1.467 1.77 0.03**
Set II
Replication 1 0.0018ns 0.0006ns 26.19* 104.904** 73.44** 8.02*
GCAf 3 0.0133** 0.0118*** 59.27*** 153.191*** 88.84*** 39.93***
GCAm 3 0.0159*** 0.0214*** 356.91*** 200.199*** 212.98*** 38.62***
SCA 9 0.0074** 0.0053** 46.39*** 87.584*** 29.00** 2.48ns
Error 15 0.0015 0.001 3.6 10.958 4.92 1.03
CV (%) 10.292 9.646 7.19 7.051 4.38 2.34
Mean 0.3775 0.3339 26.38 46.946 50.66 43.39
R2 0.8732 0.9047 0.97 0.922 0.94 0.95
GCA/(GCA+SCA)% 66.4819 75.8768 81.77 66.859 83.88 94.06
GCAf/GCAm ratio   0.8377 0.553 0.17 0.765 0.42 1.03

d.f., degree of freedom; TTY, total tuber yield (kg plant-1); MTY, marketable tuber yield (kg plant-1); ATW, average tuber weight (g); GC, groundcover (%); PHT, plant height (cm); CC, chlorophyll content (SPAD reading); GCA, general combining ability; GCAf, general combining ability for female; GCAm, general combining ability for male; SCA, specific combining ability; R2, coefficient of determination.

significant at

*** p < 0.001

** p < 0.01

* p < 0.05

non-significant at p value 0.05.