Table 6.
Analysis of variance showing F-statistic for combining ability effects for four disease parameters and eight agronomic traits of 45 groundnut genotypes evaluated in two seasons in Tanzania.
| Source of variation | DF | Disease parameters | Agronomic parameters | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| %RI85 | %RI100 | %LLS85 | %LLS100 | DTF | PH | NPP | DTM | PDY | HSW | SP | KY | ||
| GCA | 11 | 7.21*** | 7.79*** | 6.11*** | 6.51*** | 3.45*** | 91.88*** | 0.93 | 2.34** | 4.01*** | 8.25*** | 0.84 | 3.45*** |
| SCA | 19 | 4.14*** | 3.51*** | 2.81*** | 2.86*** | 2.66*** | 88.75*** | 2.0** | 4.38*** | 3.74*** | 7.60*** | 0.71 | 2.66*** |
| GCA*ENV | 11 | 0.14 | 0.25 | 0.42 | 0.84 | 0.29 | 0.28 | 2.22* | 0.22 | 0.32 | 1.49 | 0.51 | 0.29 |
| SCA*ENV | 19 | 0.11 | 0.14 | 0.32 | 0.66 | 0.24 | 0.66 | 1.60* | 0.21 | 0.19 | 2.01** | 0.50 | 0.24 |
| REC | 14 | 2.65** | 3.64*** | 2.78*** | 3.63*** | 9.33*** | 27.25*** | 2.58** | 2.37** | 10.84*** | 6.86*** | 1.38 | 9.33*** |
| REC*ENV | 14 | 0.14 | 0.28 | 0.27 | 0.90 | 0.25 | 1.02 | 2.26** | 0.16 | 0.10 | 1.23 | 0.34 | 0.25 |
DF degrees of freedom, %RI85 percentage rust infection at 85 days after planting, %RI100 percentage rust score infection at 100 days after planting, %LLSI 85 Percentage late leaf spot infection at 85 days after planting, %LLSI 100 percentage late leaf spot infection at 100 days after planting, DTF days to flowering; PH plant height, NPP number of pods per plant, DTM days to maturity, PDY pod yield, HSW hundred seed weight, SP shelling percent, KY kernel yield, GCA general combining ability, SCA specific combining ability, ENV environment/season; REC reciprocal, GCA*ENV general combining ability by environment/season interaction, SCA*ENV specific combining ability by environment/season interaction, REC*ENV reciprocal by environment/season interaction.
*,** and *** represent significant differences at 0.05, 0.01 and 0.001 probability levels, respectively.