The small variation in the day temperature of 15 ◦C versus 17 ◦C in the topsoil affected plant growth and a significant genotype-by-temperature interaction was detected for the chlorophyll content (SPAD) and the operating efficiency of
photosystem II (ΦPSII). At 15/13 ◦C compared to 24/20 ◦C, differences between genotypes for the primary lateral root (PrLat) length and its portion on the embryonic root system were hardly affected by temperature