ISHS Acta Horticulturae 229: Symposium on Biological Aspects of Energy Saving in Protected Cultivation
GENETIC DIFFERENCES IN NET PHOTOSYNTHETIC TEMPERATURE RESPONSE OF VRIESEA-SPECIES AND -HYBRIDS |
| Authors: | L. Lauwers, O. Mekers, D. Vertonghen, A. Calus |
| Abstract:
Measurements of net photosynthesis in response to leaf temperature at a low light level (135 μE.m-2.s-1) were used as a tool to describe the energy demand of four Vriesea-genotypes and of the individuals of one interspecific cross population. Parameters derived from these temperature response curves were optimum temperature and net photosynthetic rates at the optimum temperature, at 20°C and at 14°C. Considerable differences were found between the different genotypes and within the progeny of the interspecific cross. The values of each parameter observed in the cross population were normally distributed. Their mean values were situated in between the mean parameter values of the parents, except for the optimum temperature and the net photosynthesis at 14°C, considered as the two main criteria for further selection. Nevertheless, in the cross population, promising genotypes were found combining a low optimum temperature and a high net photosynthetic rate at low temperature. | |
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