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Aluminum Tolerance in Medicago truncatula Germplasm

^a The Samuel Roberts Noble Foundation, Ardmore, OK 73402
^b Dep. of Statistics, Oklahoma State Univ., Stillwater, OK 74078-1056

View larger version (19K): [in a new window]   Fig. 1. Average relative root growth, the ratio of seedling root length grown without Al to seedling root length grown with Al, of 60 M. truncatula accessions exposed to Al stress at 0, 5, 15, 25, and 50 µM AlCl3.

View larger version (34K): [in a new window]   Fig. 2. Relative root growth, the ratio of seedling root length grown without Al to seedling root length grown with Al, of one Al sensitive (W6 6018) and three Al tolerant (W6 6026, W6 6027, and W6 5997) accessions of M. truncatula in 0, 5, 15, 25, and 50 µM Al.

View larger version (12K): [in a new window]   Fig. 3. Frequency distribution of relative root growth, the ratio of seedling root length grown without Al to seedling root length grown with Al, for seedlings of 321 M. truncatula accessions exposed to 25 or 50 µM AlCl3 for 5 d in hydroponics.

View larger version (13K): [in a new window]   Fig. 4. Frequency distribution of root length of seedlings for 321 M. truncatula accessions grown without Al for 5 d in hydroponics.

View larger version (16K): [in a new window]   Fig. 5. Frequency distribution of root length of seedlings for 321 M. truncatula accessions exposed to 25 and 50 µM AlCl3 for 5 d in hydroponics.