Genetic variation for disease and nematode resistances and forage quality in perennial diploid and tetraploid lucerne populations (Medicago sativa L.)

Euphytica ◽  
1996 ◽  
Vol 91 (2) ◽  
pp. 241-250
Author(s):  
B. Julier ◽  
P. Guy ◽  
C. Castillo-Acuna ◽  
G. Caubel ◽  
C. Ecalle ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Medicago Sativa ◽  
Forage Quality ◽  
Medicago Sativa L

GENETIC VARIATION FOR FORAGE QUALITY OF ALFALFA STEMS

1987 ◽  
Vol 67 (4) ◽  
pp. 1057-1067 ◽  
Author(s):  
D. R. BUXTON ◽  
G. C. MARTEN ◽  
J. S. HORNSTEIN
Keyword(s):  
Cell Wall ◽  
Genetic Variation ◽  
Medicago Sativa ◽  
Crude Protein ◽  
Nutritive Value ◽  
Growth Traits ◽  
Forage Quality ◽  
In Vitro Digestibility ◽  
Medicago Sativa L

When normally harvested for hay, the basal portion of alfalfa (Medicago sativa L.) stems is low in forage quality. This study was conducted to determine whether genetic variation for in vitro digestible dry matter (IVDDM) and crude protein (CP) concentration of stems of perennial Medicago spp. could be identified and whether morphological and chemical traits were associated with variation in these characteristics of stems. The lower six nodes and internodes of stems and total herbage from 64 Plant Introduction (PI) accessions and five cultivars of field-grown plants were harvested twice when most plants were at the early seed-pod stage of maturity. Several morphological and growth traits were measured, and both stems and total herbage were evaluated for IVDDM and CP concentration. Covariant analysis was used to adjust in IVDDM and CP concentration of stems for differences in plant maturity. Significant variation for IVDDM and CP concentration in stems existed among the cultivars and among the accessions. Some accessions had significantly higher stem IVDDM or CP concentration than control cultivars. The M. sativa accession, PI 440496, had the fourth highest stem IVDDM and third highest stem CP, with concentrations of 374 and 79 g kg−1, respectively. The number of ridges on stems (stem shape) was significantly correlated with stem IVDDM and CP concentration with average correlation coefficients of 0.30 and 0.35, respectively. Cell-wall concentration and lignin concentration per unit cell wall of stems were both negatively correlated with stem IVDDM and CP concentration. Selection for improved nutritive value of stems may have potential for improving the nutritive value of alfalfa herbage.Key words: Alfalfa, forage quality, crude protein, in vitro digestibility, Medicago sativa L.

Forage Quality Components in Grazing-Type Lucerne (Medicago sativa L. complex)

2001 ◽  
Vol 187 (3) ◽  
pp. 145-152 ◽  
Author(s):  
L. Pecetti ◽  
N. Berardo ◽  
M. Odoardi ◽  
E. Piano
Keyword(s):  
Medicago Sativa ◽  
Forage Quality ◽  
Medicago Sativa L

DURÉE D’INTERFÉRENCE DU CHIENDENT, Agropyron repens (L.) Beauv. DANS LA LUZERNE, Medicago sativa L.

1987 ◽  
Vol 67 (2) ◽  
pp. 451-456
Author(s):  
D. PAGEAU ◽  
G. D. LEROUX
Keyword(s):  
Cell Wall ◽  
Medicago Sativa ◽  
Protein Content ◽  
Forage Quality ◽  
Medicago Sativa L ◽  
Agropyron Repens

A study was conducted at St-Augustin, Quebec, in 1984 and repeated in 1985 to determine the tolerable period of interference between alfalfa (Medicago sativa L.) and quackgrass (Agropyron repens (L.) Beauv.) during the year of establishment. Glyphosate was used prior to seeding of alfalfa to control quackgrass. Haloxyfop-methyl, a selective grass herbicide, was sprayed at different periods after crop emergence to control quackgrass. This herbicide was applied at 3, 6 and 9 wk after alfalfa emergence. A 3-wk period of interference provided equivalent proportion of alfalfa in forage and the same level of forage quality as the quackgrass-free control. Delaying haloxyfop-methyl treatments to more than 3 wk resulted in an increased proportion of quackgrass in forage which caused a reduction of the protein content and an increase of the cell wall contents (NDF and ADF). Alfalfa density did not differ between 0 and 3 wk of interference of quackgrass, but tended to be reduced with a longer period of interference.Key words: Quackgrass, alfalfa, duration of interference, haloxyfop-methyl, glyphosate, forage quality

scholarly journals Genetic variation for seed yield and its components in alfalfa (Medicago sativa L.) populations

Agronomie ◽  
2000 ◽  
Vol 20 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Eduardo-Daniel Bolaños-Aguilar ◽  
Christian Huyghe ◽  
Bernadette Julier ◽  
Christian Ecalle
Keyword(s):  
Genetic Variation ◽  
Medicago Sativa ◽  
Seed Yield ◽  
Medicago Sativa L

The Effect of Insect Defoliation on the Presence and Severity of Fusarium Crown-Rot in Alfalfa

1990 ◽  
Vol 25 (2) ◽  
pp. 253-260 ◽  
Author(s):  
J. W. Lee ◽  
P. D. Colyer ◽  
S. S. Quisenberry
Keyword(s):  
Medicago Sativa ◽  
Fusarium Oxysporum ◽  
Plant Height ◽  
Forage Quality ◽  
Crown Rot ◽  
Short Term ◽  
Fusarium Crown Rot ◽  
Carbohydrate Reserves ◽  
Insect Defoliation ◽  
Medicago Sativa L

Alfalfa Medicago sativa L. (‘Fla. 77’) was inoculated with three different isolates of Fusarium and defoliated to varying levels with yellowstriped armyworms, Spodoptera ornithogalli (Guenée), to determine the effect of insect defoliation on the development of crown-rot under greenhouse conditions. There were no significant interactions between short-term insect defoliation and Fusarium crown-rot on forage quality, yield, or root carbohydrate reserves. Although insect defoliation alone did reduce plant height, yield, and maturity (18, 33, and 30% respectively) at the first harvest, no significant effects were observed at two subsequent harvests. Of the three isolates tested, Fusarium oxysporum Schlecht was the most virulent. Short-term defoliation did not increase the severity of Fusarium crown-rot in alfalfa.

scholarly journals Identification of genetic loci associated with forage quality in response to water deficit in autotetraploid alfalfa (Medicago sativa L.)

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Sen Lin ◽  
Cesar Augusto Medina ◽  
Bill Boge ◽  
Jinguo Hu ◽  
Steven Fransen ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Water Deficit ◽  
Forage Quality ◽  
Genetic Loci ◽  
Medicago Sativa L ◽  
Response To Water

scholarly journals GENETIC VARIATION FOR TEMPERATURE RESPONSE IN ALFALFA (MEDICAGO SATIVA L.)

1980 ◽  
Vol 60 (2) ◽  
pp. 547-554 ◽  
Author(s):  
R. J. McLAUGHLIN ◽  
B. R. CHRISTIE
Keyword(s):  
Genetic Variation ◽  
High Temperature ◽  
Medicago Sativa ◽  
Temperature Response ◽  
Field Performance ◽  
Field Trials ◽  
Growth Room ◽  
Medicago Sativa L ◽  
High Yields ◽  
Response To Temperature

Physiological studies had indicated that low mid-summer yields of alfalfa (Medicago sativa L.) can be attributed to high temperature. A program was initiated to study genetic variation for response to high temperatures. Two thousand genotypes were grown from seed in the growth room at 20/15 °C, harvested twice, then grown at 30/25 °C for two more harvests. A great deal of variation among genotypes was found to exist for response to temperature. Genotypes that were found to yield well at higher temperatures tended to be early-maturing with few stems per plant. Genotypes that yielded well at low temperatures tended to be later in maturity and to have a large number of stems. Based upon dry matter yields, 300 genotypes were selected to represent differences in responses, namely: 100 had high yields at high temperature only; 100, high at low temperature only; and 100, high at both temperatures. These selections were transplanted to the field for subsequent field trials to substantiate growth room findings. Little or no relationship was found between growth room performance and field performance. This lack of association was due in part to winter injury experienced the first year. In addition, temperatures experienced in the field were much lower than those used indoors.

Effect of rhizobia symbiosis on lignin levels and forage quality in alfalfa (Medicago sativa L.)

2016 ◽  
Vol 233 ◽  
pp. 55-59 ◽  
Author(s):  
Zhiqiang Zhang ◽  
Linhui Shao ◽  
Leqin Chang ◽  
Yuman Cao ◽  
Tong Zhang ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Forage Quality ◽  
Medicago Sativa L
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