Assessment of Relationships among Yield and Quality Traits in Alfalfa (Medicago sativa) under Dryland Farming System, Hamadan, Iran

Journal of Rangeland Science

مقاله 10، دوره 1، شماره 3، تیر 2011، صفحه 247-254   

نوع مقاله: Research and Full Length Article

نویسندگان

M. Davodi¹؛ A. A. Jafari^{* 2}؛ G. Assadian³؛ A. Ariapour⁴

¹DIslamic Azad University, Borujerd Branch

²Research Institute of Forests and Rangelands, Tehran,

³Agricultural Research center, Hamadan,

⁴Islamic Azad University, Borujerd Branch

چکیده

Seeds of 200 accessions of alfalfa (Medicago sativa L.) were provided from Iranian
natural resource gene bank and were sown as drilled plot using alpha designs/unreplicated
with 2 repeated entries within all of 10 blocks under dry land farming system in agricultural
research center of Hamadan, Iran during 2009 to 2010. The data were collected and analyzed
for plant height, stem number, leaf stem ratio (LSR), node number, vegetation score, forage
dry matter yield (DM yield), crude protein (CP), dry matter digestibility (DMD), water
soluble carbohydrates (WSC), crude fiber (CF), acid detergent fiber (ADF), and total ash. DM
yield was positively correlated with node number, plant height, stem number, vegetation score
and negatively correlated with leaf/stem ratio, DMD(%), CP(% )and WSC(%). The factorial
analysis was based on the principal component extraction and varimax rotation method.
Results of factor analysis were accounted for 81% of total variance for first six factors. Factor
1 which was accounted for 19% of variation was associated with DMD, WSC and ADF. This
factor was regarded as quality factors. Factor 2 accounted for 17% of variation was named as
the productivity factor since it included DM yield, vegetation score and leaf/stem ratio. Since
the third (CP and CF) and forth factors (plant height and node number) were important. Based
on ward cluster analysis, 200 entries were divided into 7 groups. Accessions in 4 clusters were
calculated well above the overall mean for DMD, CP, WSC and total ash. The accessions in
cluster 7 had higher values for DM yield and morphological traits. The results of this study
indicate that selection of variables in productivity factor (factor2) could enable breeders to
release the desirable increment in forage yield of alfalfa.

کلیدواژه‌ها

Alfalfa (Medicago sativa)؛ yield؛ Quality؛ factor analysis؛ Cluster Analysis

مراجع

Fonseca, C. E. L., D. R. Viands, J. L.
Hansen, and A.N. Pell. 1999.
Associations among forage quality
traits, vigor, and disease resistance in
alfalfa. Crop Sci. 39: 1271-1276.
Hanna, W. W. 1993. Improving forage
quality by breeding. International
crop Science 1: 671-675.
Hayek, T., M. Loumerem, K. Nagaz
and M. Thabet. 2008. Growth
development and dry matter yield of
16 Lucerne genotypes cultivated in
south Tunisia Options
Méditerranéennes, Series A, 79: 299-
302.
Humphreys, M.O. 1991. A genetic
approach to the multivariate
differentiation of perennial ryegrass
(Lolium perenne L.) populations.
Heredity, 66: 437-443.
Jafari, A. V. Connolly, A. Frolich and
E. K. Walsh. 2003a. a note on
estimation of quality in perennial
ryegrass by near infrared
spectroscopy. Irish J. of agricultural
and food research 42: 293-299.
Jafari, A., Nosrati Nigeh, M. and
Haidari Sharifabadm H. 2003b.
Comparison of yield, morphological
and quality traits in 18 ecotypes and
varieties of alfalfa (Medicago sativa)
grown under irrigated and nonirrigated conditions. Proceeding of
the VIIth International Rangelands
congress, Durban, South Africa,
pages 1403-1405.
Julier, B., Huyghe, C. and Ecalle, C.
(2000). Within and among-cultivar
genetic variation in alfalfa. Crop
Science, 40: 365-369.
Julier, B., Ecalle, C. and Huyghe, C.
1999. Potential for including the
digestibility in breeding of alfalfa. In:
Lucerne and Medics for the XXI
century. Proceeding of the XIII
EUCARPIA Medicago spp. Group
meeting, Perugia, Italy, 13-16
September 1999, pages 125-133.
Mueller, S. C., and Orloff, S. B. 1994.
Environmental factors affecting
forage quality. In: Proc. 24t h
California Alfalfa Symposium, 8-9
December 1994, Redding, California,
pp.56-62.
Mulitze, D. 2004. Agrobase Generation
II. Users Manual. Agronomix
Software Inc. Winnepeg MB.
http://www.agriconnection.com/id24.
htm
Patterson, H. D. and Williams E. R.
1976. A new class of resolvable
incomplete block designs.
Biometrika 63: 83-90.
Riday, H. and E. C. Brummer. 2004.
Relationships among biomass yield
components within and between
subspecies of alfalfa. Medicago
Genetic Reports 4: 1-7
Rotilli, P. Gnocchi, G. Scotti, C. and
Kertikova, D. 2001. Breeding of the
alfalfa plant morphology for quality.
In: Quality in Lucerne and medics
for animal production, Options
Méditerranéennes, Series A, 45: 25-
27.
Smith, K. F., Reed, K. F. M. and Foot,
J. Z. 1997. An assessment of relative
importance of specific traits for the
genetic improvement of nutritive
value in dairy pasture. Grass and
Forage Science 52: 167-175.