GROWTH ANALYSES OF TOMATO GENOTYPES GROWN UNDER LOW-ENERGY CONDITIONS

Growth analyses were carried out with young plants of a series of tomato genotypes grown at three night temperatures (NT), under an 8 h photoperiod and a low light intensity. Significant genotypic differences for RGR, NAR, LAR, SLA and LWR occurred. For these characters, significant but small genotype x NT interactions were also found. RGR, LAR and SLA increased and LWR decreased with higher NT, while there was no distinct NT effect on NAR. Between NAR and LAR, and NAR and SLA a strong negative correlation was observed, and between LAR and SLA a positive correlation. Plant weight was also strongly influenced by seed size.