ABSTRACT:
Fifteen ISSR (inter-simple sequence repeat) primers were used to evaluate the genetic diversity among and within commercial crops of T. grandiflorum (Willd. ex Spreng.) K. Schum. For this, 60 specimens were analyzed, distributed in three crops. A total of 102 bands were amplified, with a polymorphism percentage of 52.0% at species level and an average of 6.8 alleles per ISSR primer. The average for polymorphism information content (PIC) index was 0.55. In relation to the genetic diversity index of Nei (H), and Shannon (I), crops analyzed showed the following values: : SAR H = 0,114 e I = 0,177; SSL H = 0,108 e I = 0,162 e SEC H = 0,104 e I = 0,156, considered moderate to low values. AMOVA showed 34.91% of total variance among the crops, and 65.09% within them. The ISSR molecular markers revealed that there is genetic diversity within each commercial crops studied, thus is possible to select superior genotypes that can be used to give more uniform crops. This result has been considered of great relevance, to provide tools for breding implementation programs and design conservation strategies ex situ and in situ.
Key words:
Theobroma grandiflorum; genetic variability; molecular markers.
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