Atanassova, B. Combining ability for style Inheritance of style and anther length in and anther length in a tomato diallel tomato F1 crosses is of great importance for cross. hybrid seed production based on maternal lines with exserted stigma because these characters  are  the  main  components  determining  the  manifestation  of  longistyly  in  F1 flowers.  The observed fact that short style is associated with shorter pollen tube length does not always guarantee successful  correction  of  longistyly  in  F1  (TGC,  1976)  imposed  a  study  on  the  combining  ability  for these  two  components  in  an  8  x  8  diallel  cross  including  the  following  parental  lines,  form  and cultivars: Rutgers-21, GCR-66, Red Cherry, line XXIV-13, Penelopa, line 7/3, L. pimpinellifolium-108 and L. hirsutum f. glabratum. Combining ability was estimated after Griffing (1956) method 2, model II. Results obtained by the analysis of variance of and SCA for both components (Table 1) show that  general,  as  well  as  specific,  combining  ability  has  a  considerable  effect  on  style  and  anther length variation. For both components GCA is much greater, which means that additive gene effects are greater than non-additive. Data presented in Table 2 reveal that the choice of parental components can be based on GCA values.  Line  7/3,  which  best  corrects  longistyly  in  F1,  has  lowest  GCA  value  for  style  length, while GCR-66, which has the longest style and for which correction of longistyly in its F1 crosses is almost impossible, has also the highest GCA values for this character. Considering anther length, however, SCA should be studied because by data of parental GCA  no prediction can be made of the heterosis effect which in some cases is of great importance for correcting F1 longistyly.  

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