Table 2.

List of ten quantitative traits investigated in the hydroponic system

Abbr.	Trait	Method of measurement	Unit
TN	Tiller number	Number of tillers with first leaf unfolded after 14 days
LN	Leaf number	Number of leaves longer than 2 cm after 14 days
LL	Leaf length	Length of the youngest completely unfolded leaf after 14 days	cm
HEI	Plant height	Length of the plant from basis to leaf tip after 14 days	cm
SDW	Shoot dry weight	Weight of shoot mass after 2 days of drying at 80°C	mg
RL	Root length	Length of the longest root from crown to root tip after 14 days	cm
RDW	Root dry weight	Root weight after 2 days of drying at 80°C	mg
LRR	Leaf to root ratio	Ratio of leaf to root length
SRR	Shoot to root ratio	Ratio of shoot to root dry weight
CC	Chlorophyll content	Average of 10 measurements with SPAD-502 meter a in the middle of the youngest leaf after 10 days	SPAD

^a SPAD 502 meter: Minolta Camera Co., Osaka, Japan.