The lower leaf chlorophyll
contents
expressed as leaf greenness (SPAD units)
was indeed observed here (fig. 1)
during the tillering phase of D. glomerata and L. perenne
treated at both −5°C or −10°C.
However, highly significant differences in the relative chlorophyll content
were observed between the investigated species and varieties of grasses.
These differences depended on the low temperature applied,
varieties, species, and the time of measurement (table 1).