Early identification of papaya sex type from seed physical characters and seedlings isozyme patterns
Identification of papaya sex can only be done four months after transplanting. The possibility of earlier sex identification either with isoenzymatic patterns or physical seed traits were evaluated in two commercial seeds: the hybrid Tainung 1 and Improved Sunrise Solo 72/12 four experiments were carried out in the Lavras municipality, Minas Gerais (Brazil). The first two experiments evaluated the relationship of seed physical characteristics such as sizes and weight and the corresponding sex using a complete randomized block design with four replications in a 2 x 3 factorial arrangement. The third experiment evaluated the relationship between seed vigor based on four seed emergence stages and sexual expression, using a completely randomized design with 5 replications in a 2 × 4 factorial arrangement. The fourth experiment tested for the two cultivars used, three isozyme systems: peroxidase (PER), esterase (EST) and leucineaminopeptidase (LAP) using leaf tissue from 4 or 5 leaves seedlings. There were no difference between seeds classified by size or weight and sexual expression. In Tainung 1 hybrid, seeds with higher initial vigor developed a higher proportion of hermaphrodite plants in contrast with a lower proportion of female plants from seed with less vigor. Seedlings with lower leaf number developed a higher number of hermaphrodite plants. PER, EST and LAP systems did not allow the identification of the sex of the two cultivars studied. Based on results it can be concluded for the hybrid seeds Tainung 1 that for seeds of uniform size and weight, sown on the same date and with similar agronomic conditions that seedlings of the greater vigor produced higher proportion of hermaphrodite plants. Additionally, within seedling stages I is possible to determine sex differentiation with by the number of leaves.
| Main Authors: | , , |
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| Format: | info:eu-repo/semantics/article biblioteca |
| Language: | spa |
| Published: |
Corporación Colombiana de Investigación Agropecuaria (Agrosavia)
2008
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| Subjects: | Determinación del sexo, Papayas, Frutales, |
| Online Access: | http://revista.corpoica.org.co/index.php/revista/article/view/101 http://hdl.handle.net/20.500.12324/33851 |
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| Summary: | Identification of papaya sex can only be done four months after transplanting. The possibility of earlier sex identification either with isoenzymatic patterns or physical seed traits were evaluated in two commercial seeds: the hybrid Tainung 1 and Improved Sunrise Solo 72/12 four experiments were carried out in the Lavras municipality, Minas Gerais (Brazil). The first two experiments evaluated the relationship of seed physical characteristics such as sizes and weight and the corresponding sex using a complete randomized block design with four replications in a 2 x 3 factorial arrangement. The third experiment evaluated the relationship between seed vigor based on four seed emergence stages and sexual expression, using a completely randomized design with 5 replications in a 2 × 4 factorial arrangement. The fourth experiment tested for the two cultivars used, three isozyme systems: peroxidase (PER), esterase (EST) and leucineaminopeptidase (LAP) using leaf tissue from 4 or 5 leaves seedlings. There were no difference between seeds classified by size or weight and sexual expression. In Tainung 1 hybrid, seeds with higher initial vigor developed a higher proportion of hermaphrodite plants in contrast with a lower proportion of female plants from seed with less vigor. Seedlings with lower leaf number developed a higher number of hermaphrodite plants. PER, EST and LAP systems did not allow the identification of the sex of the two cultivars studied. Based on results it can be concluded for the hybrid seeds Tainung 1 that for seeds of uniform size and weight, sown on the same date and with similar agronomic conditions that seedlings of the greater vigor produced higher proportion of hermaphrodite plants. Additionally, within seedling stages I is possible to determine sex differentiation with by the number of leaves. |
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