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Amino Acid and Protein Changes during Cold Acclimation of Green-Type Annual Bluegrass (Poa annua L.) Ecotypes

^a Dep. of Plant Agriculture, Univ. of Guelph, Guelph, ON, Canada N1G 2W1
^b Centre de Recherche en Horticulture, Dép. de Phytologie, Univ. Laval, Sainte-Foy, QC, Canada G1K 7P4
^c Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, Sainte-Foy, QC, Canada G1V 2J3

View larger version (30K): [in a new window]   Fig. 1. Amino acid concentrations in crowns of three annual bluegrass ecotypes cold acclimated to the following conditions: nonhardened (NH); hardened 2 wk at 2°C (H2); hardened 2 wk at 2°C followed by 2 wk at -2°C (HF); hardened 4 wk at 2°C (H4).

View larger version (30K): [in a new window]   Fig. 2. Amino acid concentrations in crowns of three annual bluegrass ecotypes cold acclimated in an unheated greenhouse during the 1998 to 1999 winter season. Vertical bars present the Fisher's least significant difference at P = 0.05.

View larger version (74K): [in a new window]   Fig. 3. SDS-PAGE of total soluble proteins of annual bluegrass ecotypes CR and OK during their cold acclimation in the unheated greenhouse during winter 1998 to 1999. Molecular masses of protein standards are indicated on the left. Arrows to the right mark the 31-, 30-, 27-, 26-, 16-, and 13-kDa polypeptides. Proteins corresponding to a similar DW were loaded in each gel.

View larger version (68K): [in a new window]   Fig. 4. SDS-PAGE of thermostable proteins of annual bluegrass ecotypes CR and OK during their cold acclimation in the unheated greenhouse during winter 1998 to 1999. Molecular masses of protein standards are indicated on the left. Arrows mark the 29-, 26-, 22-, 21-, 20-, 14-, and 12-kDa polypeptides. Proteins corresponding to a similar DW were loaded in each gel.