Cold tolerance improvement of sugary enhancer1 hybrids of sweet corn [Zea mays L.; Spain]
2006
Ordás, B. | Padilla, G. | Malvar, R.A. | Ordás, A. | Rodríguez, V.M. | Revilla, P.
The ears of su1se1 hybrids have a higher quality for human consumption and maintain the eating quality for a longer period than su1 cultivars. The main problem of su1se1 hybrids when compared to su1 hybrids is reduced emergence and poor early vigour, especially in cold soils. Inbreds su1, inbreds su1se1, hybrids su1se1, and hybrids su1 x su1se1 were evaluated for traits associated with cold resistance (NW Spain, 1999 and 2000). The plants were grown in the field and in a growth chamber at cold and optimum temperatures with the following objectives: 1) to study the relationships between emergence and early vigour in the field and in a chamber at cold temperature; 2) to find sources of favourable alleles among adapted su1 inbred lines to improve cold tolerance (emergence and early vigour) in su1se1 hybrids; 3) to develop a combined method using a laboratory test and field evaluation to obtain cold-resistant genotypes. In this study we found a lack of correspondence between emergence and early vigour, and also a low correlation between the performances of the genotypes under field versus cold chamber conditions. So, when choosing a cold-tolerant genotype, both traits (emergence and early vigour) and growth in the chamber and in the field should be considered. We also found that the best genotypes under cold chamber conditions had an acceptable performance under field conditions, but the apposite was not true. Therefore, to obtain cold resistant-genotypes, genotypes showing the best performance in the chamber should be chosen first and then, among these, select the best genotypes in the field. Finally, according to our results, we can conclude that emergence and seedling vigour of the su1se1 hybrids at cold temperature can be improved by the su1 inbreds
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