ISHS Acta Horticulturae 822: VI International Pineapple Symposium
PINEAPPLE HYBRIDIZATION AND SELECTION IN THAILAND |
| Author: | Suneerat Sripaoraya |
| Keywords: | Ananas comosus var. comosus, breeding, Smooth Cayenne, Queen, leaf spine heredity |
| Abstract:
Direct and reciprocal crosses were made between the pineapple cultivars ‘Smooth Cayenne’ and ‘Queen’ during 1993-1996 and both cultivars were also selfed. The objectives of the research were to produce F1 hybrids between ‘Queen’ and ‘Smooth Cayenne’, to study the heredity of leaf spines and to select F1 hybrids with good characteristics. A total of 296 F1 hybrids were produced from direct cross breeding of ‘Queen’ × ‘Smooth Cayenne’ and 131 F1 hybrids from reciprocal crosses. However, no seeds were obtained from selfing of either cultivar. Ten F1 hybrids with superior characteristics were selected from the crosses. After further evaluation of those hybrids from 2002 to 2006, the hybrids HQC34 and RC212 were selected. The two hybrids have good agronomic characteristics and yield, showed resistance to root rot and had fruits of good quality. Plants of the two hybrids have been propagated using tissue culture. In the heredity study, the ratios of 162:134 were observed for spiny vs. smooth leaf types for the ‘Queen’ × ‘Smooth Cayenne’ crosses and 71:60 for piping leaf types were observed for the ‘Smooth Cayenne’ × ‘Queen’ crosses. Neither ratio was significant by the chi-square test based on a 1:1 hypothesis. Hence, it was confirmed that there is one pair of genes having 2 alleles, S (spiny) and s, whose genotype ss is spiny and genotype Ss is piping. | |
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