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Fig. 4.18.
Combined effects of temperature and mechanical impedance on the
elongation of emerging onion seedlings: the shoot length of seedlings growing in
sand with a penetrometer pressure of 0.19 MPa at 10 (
). The
curves shown were obtained using Eqn 4.12 (from Whalley
et al
., 1999. Courtesy
of
Plant, Cell and Environment
).
), 15 (
●
) or 20°C (
Fig. 4.19.
Combined effects of mechanical impedance and water (osmotic) stress
on the elongation of emerging onion seedlings: the shoot length of seedlings
growing in sand with a penetrometer pressure of 0.19 MPa with either -30 kPa
water potential (
) (just to avoid saturation and ensure aeration) or a water stress of
-0.4 MPa (
) induced by polythene glycol of high molecular weight. The curves
shown were derived using Eqn 4.12, with a delay in germination for the water-
stressed seed calculated using a germination model (from Whalley
et al
., 1999.
Courtesy of
Plant, Cell and Environment
).
●
