Determination of incompatibility alleles of Scavina 6 (Theobroma cacao L.) clone in farm selections. In: Agrotrópica v. 25 p. 93-96, 2013.

Abstract

The objective of this work was to determine the groups of self-incompatible clones that possess alleles of Scavina 6 (Sca 6), the main source of witches´broom resistance.This information is quite important because it is possible to determine which farm selections are more related to the Scavina clone. The clones used for determining the two phenotypic groups of incompatibility were TSA 656, TSA 654 (Sca6 x IMC 67), TSH565, TSH 516 (Sca 6 x ICS 1), Sca 6, Sca 12, IMC 67. The VB farms selections were crossed with two clones, each one with different Sca 6 incompatibility alleles (S2 or S3 ). Thirty pollinations were accomplished for each cross. It was determined that TSH 565 or TSH 516 belongs one group and TSA 656 or CEPEC 42 to different phenotypic group. The presence of Sca 6 alleles is confirmed in most of the farm selections studied (VB 184,VB 195,VB 276,VB 277,VB 430,VB 547,VB 549,VB 566,VB 1128,VB 1142).