View Full Table | Close Full ViewTable 1.

Mean, standard deviation, and range of agronomic traits and cell wall components of 373 wild diploid alfalfa (Medicago sativa L.) genotypes in 2 yr (2007 and 2008) averaged across locations.

 
2007
2008
Range
Range
Trait† Mean ± SD Individuals Accessions Mean ± SD Individuals Accessions
Yield 55 ± 34 4–209 6–194 384 ± 209 9–2193 106–2185
Regrowth 2.8 ± 0.7 1.2–4.9 1.9–4.3 3.4 ± 1.2 0.1–6.1 0.9–5.0
Stem Ratio 0.4 ± 0.1 0.1–0.7 0.14–0.49 NA NA NA
Stem Weight 23 ± 16 0.8–104 1–94 NA NA NA
Spring Regrowth NA NA NA 2.3 ± 0.7 0.3–6.4 1.0–6.4
Plant Height NA NA NA 81 ± 14 26–133 49–117
Stem Thickness NA NA NA 2.3 ± 0.6 0.4–4.1 0.83–3.82
NDF 532 ± 35 375–641 411–604 655 ± 39 511–764 519–742
ADF 384 ± 33 237–478 269–445 497 ± 37 363–581 371–572
ADL 93 ± 9 58–122 66–115 120 ± 8 88–139 94–137
TNC 162 ± 19 100–285 110–261 106 ± 12 86–169 90–161
Arabinose 33 ± 4 22–45 26–41 24 ± 3 14–39 15–39
Glucose 276 ± 17 212–318 238–302 315 ± 16 262–359 279–344
Xylose 81 ± 6 50–100 59–93 97 ± 7 67–122 77–114
NDF = neutral detergent fiber; ADF = acid detergent fiber; ADL = acid detergent lignin; TNC = total nonstructural carbohydrates. Total biomass yield and stem weight were reported as grams plot−1, stem thickness is measured in millimeters and cell wall components (NDF, ADF, ADL, TNC, arabinose, glucose, and xylose) were measured as grams kilogram−1. The regrowth score of 0 indicates no growth, whereas 9 indicates abundant growth.



View Full Table | Close Full ViewTable 2.

Pearson's correlations coefficients among genotypic means of selected cell wall constituents and yield on plants grown in 2007 and 2008.

 
Traits† Year Yield 2007‡ Yield 2008
NDF 2007 NS 0.16
ADF 2007 NS 0.14
ADL 2007 –0.16 NS
TNC 2007 NS NS
Glucose 2007 0.29 0.19
Regrowth 2007 0.56 0.42
NDF 2008 0.29 0.54
ADF 2008 0.32 0.55
ADL 2008 0.14 0.37
TNC 2008 –0.18 –0.36
Glucose 2008 0.33 0.54
Plant height 2008 0.34 0.59
Stem thickness 2008 0.38 0.66
Regrowth 2008 0.43 0.48
Yield 2008 0.64 1.00
NDF = neutral detergent fiber; ADF = acid detergent fiber; ADL = acid detergent lignin; TNC = total nonstructural carbohydrates.
Correlations shown are significant at the 1% probability level and NS indicates no significance.



View Full Table | Close Full ViewTable 3.

Mean of cell wall components and agronomic traits of the five main populations of diploid alfalfa (Medicago sativa L.) in the Watkinsville trial over 2 yr (2007 and 2008).

 
Population
Trait† Units Southern (A) Caerulea Northern (B) Caerulea Hemicycla Lowland (A) Falcata Upland (B) Falcata
2007
NDF g kg−1 548a‡ 538b 539b 506d 530c
ADF g kg−1 401a 388b 387b 359d 376c
ADL g kg−1 103a 96c 100b 89e 93d
TNC g kg−1 137d 153b 147c 175a 172a
Arabinose g kg−1 29c 33b 32b 36a 36a
Glucose g kg−1 260c 271b 258c 271b 276a
Xylose g kg−1 80b 81a,b 82a 75c 82a
Biomass yield g plot−1 36c 65a 29d 49b 56b
Stem proportion 0.38a 0.40a 0.38a 0.29c 0.36b
Regrowth score 2.7c 3.1a,b 2.5d 3.3a 3.0b
2008
NDF g kg−1 637c 668a,b 661b 623d 669a
ADF g kg−1 479c 506a 498b 466d 507a
ADL g kg−1 117c 121a,b 122a 112d 120b
TNC g kg−1 116b 109d 108d 121a 112c
Arabinose g kg−1 25b 23d 23d 28a 24c
Glucose g kg−1 310b 322a 311b 304c 321a
Xylose g kg−1 95b 101a 100a 92c 100a
Biomass yield g plot−1 332c 605a 266d 286d 441b
Spring growth score 2.2c 2.8a 1.9d 1.7d 2.6b
Regrowth score 3.0b 3.1a,b 1.9c 3.2a 3.2a
Plant height cm 81b 92a 76c 68d 83b
Stem thickness mm 2.09c 2.76a 2.13c 1.77d 2.46b
NDF = neutral detergent fiber; ADF = acid detergent fiber; ADL = acid detergent lignin; TNC = total nonstructural carbohydrates.
Values within rows followed by different letters are significantly different at P < 0.05.