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Osmotic and Autotoxic Effects of Leaf Extracts on Germination and Seedling Growth of Alfalfa

Dep. of Agron., Univ. of Missouri, Columbia, MO 65211

View larger version (32K): [in a new window]   Fig. 1. Generalized response of increase in seed water content during imbibition and germination at different water potentials. Phase I is imbibition, Phase II includes the onset of germination (increased metabolism and cell elongation) until the radicle emerges outside the seed coat (germination complete), and Phase III begins. Mitosis, O2 uptake, and root growth rate increase rapidly in Phase III. Adapted from Bewley and Black (1994) and Bradford (1995).

View larger version (28K): [in a new window]   Fig. 2. Effect of leaf extract concentrations on rate of seed imbibition expressed as increase in seed weight. Vertical bars represent the standard errors, some of which are hidden by the data symbol. Dashed lines and functions describe the linear fit of the data after rapid imbibition has occurred.

View larger version (16K): [in a new window]   Fig. 3. Release of autotoxic activity during imbibition of alfalfa seed as measured by root and hypocotyl length. Seed were imbibed in aerated water for 10 h before transferring to the extract-agar plates for 120 h to complete the bioassay. Vertical bars represent the standard errors, some of which are hidden by the data symbol.

View larger version (16K): [in a new window]   Fig. 4. Effect of concentration of seed extract on root and hypocotyl growth of alfalfa. Seed were imbibed with aerated water for 10 h before transferring to the extract-agar plates for 120 h to complete the bioassay. Vertical bars represent standard errors, some of which are hidden by the data symbol.

View larger version (27K): [in a new window]   Fig. 5. Effect of osmotic potential of polyethylene glycol (PEG 8000) and leaf extracts on (A) time to reach 50% of final germination (Gt50) and (B) root elongation rate. Seed were imbibed in water for 10 h before transfer to the treatment solutions. Vertical bars represent standard errors, some of which are hidden by the data symbol.