Rubiyo, PhD (S3) alumnus associated with PMB Lab., has recently published part of his dissertation research results. The following is information regarding the published journal:
Rubiyo, Trikoesomaningtyas, dan Sudarsono. 2011. Pendugaan Daya Gabung dan Heterosis Ketahanan Tanaman Kakao (theobroma cacao L.) terhadap Penyakit Busuk Buah (Phytophthora palmibora). English title: Estimation of Heterosis and Combining Ability for Resistance Against Black Pod Disease (Phytophthora palmivora) in Cacao (Theobroma cacao L.). Jurnal Penelitian Tanaman Industri (Jurnal Littri) 173(3):124-131. (in Indonesian with English Abstract – September 2011).
High yielding and disease resistance 0f cacao clone needs to be developed through breeding program. Availability of genetic parameters for various agronomic important characters in cacao would be very useful and beneficial for cacao breeding activities. Estimation of various genetic parameters could be done by analysing F1 arrays generated from semi-diallele crosses among a number of parents. The objectives of this research were to estimate genetic parameters for resistance against P. palmivora infection in cacao using F1 arrays generated from semi-diallele crosses among five cacao clones. Five cacao clones (DR 1, TSH 858, ICS 13, ICCRI 3, and Sca 6), representing an arrays of clones with increased resistance against P. palmivora infections, were used as parents to generate 10 F1 hybrid arays. This research was conducted at Kaliwining Experimental Station, Indonesian Coffee and Cacao Research Institute, Jember, Indonesia, during the period of 2008-2009. At most, 20 seedlings were evaluated for each F1 hybrid and the evaluations was replicated three times. To evaluate the response of the seedlings against P. palmivora infection, their leaves were inoculated with zoospore of P. palmivora. Relative humidity around inoculated leaves was maintained at >90% by wrapping them with plastic bag. The sizes of leaf necrose responses due to P. palmivora infections were observed during six days after inoculation and the disease intensity was calculated based on this recorded symptoms. Results of the experiments indicated that cacao clones DR 1, ICS13, and ICCRI 3 were the highest in general combining ability (GCA) for resistance character than the other two clones. Moreover, F1 hybrids originated from crosses among DR 1 x ICS 13 and TSH 858 x Sca 6 were the highest in specific combining ability (SCA) for resistance characters. Therefore, these combination crosses might be used to developed new hybrid combination resistance against P. palmivora infections. Combinations crosses showing highest heterotic value for resistance against P. palmivora infection were DR 1 x ICS 13, DR 1 x Sca 6, and ICS 13 x Sca 6.
Key words: Heterotic effects, F1 array, GCA, SCA, disease intensity.
For further information regarding this published journal, please contact: Prof. Sudarsono at email address: firstname.lastname@example.org
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