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Winter Hardiness, Root Physiology, and Gene Expression in Successive Fall Dormancy Selections from ‘Mesilla’ and ‘CUF 101’ Alfalfa

^a Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-1150
^b Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616-8515. Contribution from the Purdue Univ. Agric. Exp. Stn., Journal Series no. 16320

View larger version (43K): [in a new window]   Fig. 1. Minimum air and soil (10-cm depth) temperatures at the Agronomy Research Center.

View larger version (56K): [in a new window]   Fig. 2. Shoot height in October (A) and predicted fall dormancy rating (numerals above bars) and winter injury score in April (B) of alfalfa populations selected for contrasting fall dormancy. The cultivars Mesilla (Mesilla-O) and CUF 101 (CUF 101-O) underwent three cycles of selection for greater (-L1, -L2, and -L3) or less (-H1, -H2, and -H3) fall dormancy. The cultivars Norseman, Saranac, Lahontan, and Wadi Qurayat were included to represent the range in fall dormancy found in alfalfa. Data were averaged across 2 yr. The least significant difference (LSD, P = 0.05) is provided.

View larger version (24K): [in a new window]   Fig. 3. Relationship between fall height and winter injury of Mesilla and CUF 101 alfalfa populations presented in Fig. 2. Data are presented separately for each year and include data for Norseman, Saranac, Lahontan, and Wadi Qurayat. Asterisks (**) indicate significant linear relationship at P 0.01.

View larger version (47K): [in a new window]   Fig. 4. Root sugar (A) and starch (B) concentrations of alfalfa populations selected for contrasting fall dormancy (see Fig. 2 for population descriptions). Data are means averaged across both years. The least significant difference (LSD, P = 0.05) is provided.

View larger version (22K): [in a new window]   Fig. 5. Relationship between root sugar concentration and winter injury of all alfalfa populations presented in Fig. 2. Data are means averaged over both years. Asterisks (**) indicate significant quadratic relationship at P 0.01.

View larger version (53K): [in a new window]   Fig. 6. Root protein concentrations of alfalfa populations selected for contrasting fall dormancy (see Fig. 2 for population descriptions). Data are means averaged across both years. The least significant difference (LSD, P = 0.05) is provided.

View larger version (20K): [in a new window]   Fig. 7. Relationship between root protein concentration and winter injury of alfalfa populations presented in Fig. 2. Data are means averaged over both years. Asterisks (**) indicate significant linear relationship at P 0.01.

View larger version (39K): [in a new window]   Fig. 8. Northern blot analysis using total RNA extracted from roots of the Mesilla and CUF 101 populations in December. Blots were probed with 32P-labeled cDNA for RootCAR1, a cold acclimation-responsive cDNA isolated from alfalfa roots whose expression is associated with alfalfa winter survival. See Fig. 2 for population definitions. The blot shown is typical of several obtained using different field replicates from either year. Insufficient root tissue of Mesilla-L2 was available for Northern analysis.