Agronomic evaluation of seven experimental F1 hybrids of zapallo (Cucurbita moschata Duch. Ex Poir)

Evaluación agronómica de siete híbridos experimentales F1 de zapallo (Cucurbita moschata Duch. Ex Poir)

The purpose was to estimate the agronomic response, genotype x semester (G x S) interaction and standard heterosis (HU) for plant yield (RFP), number of fruits plant^-1 (NFP) and fruit weight (PPF) in seven experimental hybrids of pumpkin and their eight parents, during the 2003B and 2004A semesters. A complete randomized design with five replicates per treatment was used. Statistical differences (Pr<0.05 or Pr><0.01) occurred between semesters for RFP and PPF. The genotypes showed significant differences (Pr><0.01) for the tree characters. The interaction G x S did not show significant differences for the tree>< 0.05 or Pr< 0.01) occurred between semesters for RFP and PPF. The genotypes showed significant differences (Pr< 0.01) for the tree characters. The interaction G x S did not show significant differences for the tree characters. During 2003B semester occurred the best environmental conditions for the expression of RFP and PPF. Hybrids LBV x LA126, LSO x LA34, LBV x LA34 were superior to the control ‘Bolo Verde’ (BV: 17.7 kg plant^-1) in RFP with values of 24.9, 24.3 and 11.3% HU respectively. The LBV x LA34 hybrid showed better response than the control ‘Bolo Verde’ with respect to the main agronomic characters, which makes it a good candidate to improve production of fresh fruit for the interior market of Colombia

1. Alam, M.; Khan, M.; Nuruzzaman, M.; Parvez, S.; Swaraz, A.; Alam, I. y Ahsan, N. 2004. Genetic basis of heterosis and inbreeding depresion in rice (Oryza sativa L.). J. Zhejiang Univ. Sc. 5(4):406-411.
2. Amariles, C. y López, A. 1994. Aumento, caracterización, evaluación y selección de poblaciones promisorias de zapallo. Tesis Ingeniero Agrónomo, Universidad Nacional de Colombia, Palmira.
3. Caicedo, L. y Montes, P. 2002. Formación de poblaciones mejoradas de zapallo (C. moschata), a través de la recombinación de genotipos segregantes seleccionados. Tesis Ingeniero Agrónomo, Universidad Nacional de Colombia, Palmira
4. Cruz, C. y Souza, C. 2003. Modelos biométricos aplicados ao melhoramento genético. Editora UFV. Universidade Federal de Viçosa, Viçosa, 585p
5. Cruz, C. 2004. Programa GENES. Versão Windows. Aplicativo Computacional em Genética e Estatística. Universidade Federal de Viçosa, http:/ / www.ufv.br/dbg/genes/genes.htm [Accedido: 06 - 09 - 2005]
6. Escobar, G. y Muriel, V. 2002. Evaluación y selección de poblaciones promisorias de zapallo Cucúrbita spp. Tesis Ingeniero Agrónomo, Universidad Nacional de Colombia, Palmira.
7. Espitia, M. 2004. Estimación y análisis de parámetros genéticos en cruzamientos dialélicos de zapallo (Cucurbita moschata Duch. Exp Poir). Tesis Ph.D., Universidad Nacional de Colombia, Palmira
8. García, A.; León, P. y Sierra, D. 1996. Evaluación de dos poblaciones promisorias de zapallo, C. Moschata y C. maxima bajo condiciones de un lote experimental en Roldadillo. Tesis INTEP.
9. Gwanama, C.; Botha, A. y Labuschagne, M. 2001. Genetic effects and heterosis of
10. flowering and fruit characteristics of tropical pumpkin. Plant Breeding 120(3):271-272
11. Gwanama, C.; Mwala, M. y Nichterlein, K. 1998. Path analysis of fruit yield components of Cucurbita moschata Duch. Tropical Agricultural Research and Extension 1(1):19-22
12. Jaramillo, J. 1987. Características de los cultivares de zapallo Cucúrbita maxima colectadas en Colombia. Informe de progreso programa de hortalizas 1986 - 1987, ICA, Palmira, 70p.
13. Jaramillo, J.; Palacio, J. y Holl, M. 1985. Evaluación de colecciones de Cucúrbitas sp en condiciones del Valle del Cauca. II Seminario Recursos Vegetales Promisorios, Universidad Nacional de Colombia, Palmira, p.103-121
14. Korzeniewska, A. y Niemirowicz-Szczytt, K. 1993. Combining ability and heterosis effects on winter squash (Cucurbita maxima Duch.). Genetica-Polonica 34(3):259-272
15. Kumaran, S.; Natarajan, S. y Thamburaj, S. 1998. Correlation and path analysis studies in pumpkin (Cucurbita moschata Poir). South Indian Horticulture 46(3):138-142