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Short Report
ScienceAsia 32 (2006): 093-098 |doi: 10.2306/scienceasia1513-1874.2006.32.093
Evaluation of N2 Fixation Traits in Thai and
Korean Soybean Cultivars
Patcharin Tanya,a Peerasak Srinives,a* Theerayut Toojinda,b Apichart Vanavichit,a
Achara Nuntakij,c Somsak Kotepongc and Suk Ha Leed
ABSTRACT: Thirteen Thai and 21 Korean soybean cultivars were investigated for N2 fixing ability of 3 strains of
Bradyrhizobium japonicum, using a factorial arrangement in a completely randomized experimental design
(CRD). Data were collected on 5 traits, viz. nodule number per plant, nodule fresh weight per plant, nodule
dry weight per plant, plant dry weight, and acetylene reduction activity (ARA). The variation in each trait
was dependent of soybean cultivars, B. japonicum stains and interaction between cultivars and strains.
Among the soybean cultivars, KKU35 had higher nodule number, but lower ARA than ST1, revealing that
high nodule number may not correlate with the nitrogenase enzyme activity. For rhizobial strains, DASA
01026 gave high nodule number, nodule fresh weight, and nodule dry weight, while DASA 01054 gave high
nodule number, plant dry weight, and ARA. Positive correlation coefficients (r) between ARA and nodule
number, nodule fresh weight, nodule dry weight, and plant dry weight were all significant at the values of
0.438, 0.738, 0.703 and 0.635, respectively. Path coefficient analysis revealed that these N2 fixation traits
were inter-related and contributing directly and indirectly to the ARA, with the greatest contribution from
nodule fresh weight.
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a Department of Agronomy, Faculty of Agriculture, Kasetsart University, Kamphaeng Saen,
Nakhon Pathom 73140, Thailand.
b DNA Technology Laboratory, National Center for Genetic Engineering and Biotechnology,
Kasetsart University, Kamphaeng Saen, Nakhon Pathom 73140, Thailand.
c Soil Microbiology Group, Department of Agriculture, Bangkok 10900, Thailand.
d Division of Plant Science, College of Agriculture and Life Science, Seoul National University, The Republic of Korea.
* Corresponding author, E-mail: agrpss@ku.ac.th
Received 19 Apr 2005, Accepted 13 Sep 2005
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