The yS at
–0.03 MPa and –0.1 MPa corresponded to the
actual yS of the tissue extracts used in Expts. 1
and 2. Twenty-five seeds of each species were
placed on a piece of filter paper in a petri dish
and 10 mL of the PEG solution added. The
dishes were wrapped with parafilm and placed
in a growth chamber at 30 C day and 20 C
night with a 16-h photoperiod. After 4 d, germination
percent was determined.