Differential responses of soybean genotypes to excess manganese in an acid soil

A research was conducted with aims (1) to identify adaptation mechanisms of new soybean genotypes in utilizing limited P from acid mineral soil: through carbon translocation to root and through absorption of specific P, and (2) to describe the respond of soybean genotype to P fertilization. Treatments, including soybean genotypes (Slamet, 19BE, and 25EC) and P fertilization (0 and 400 mg P kg-1 in form of KH2PO4) were factorially arranged in a Completely Randomized Design with four replications. Soybean was planted in a green house using double pot system. The upper pot was filled with a mixture of sterile soil and volcano sand, and lower pot with non sterilized soil. The evaluation was performed at the end vegetative growth phase (R1). Evaluated variables were dry weight of shoot, root, and plant total, alkaline phosphatase activity, number of nodules, N and P absorption, quality specific P index. Data variation was analyzed by using F-test with degree of fredoom α = 5% and differences among treatments were separated by using Duncan Multiple Range Test (DMRT). The results showed that soybean genotype had different mechanism in using limited P from acid mineral soil. Old genotype (Slamet) had mechanism through increasing alkaline phosphatase and absorption of specific P (P-Al, P-Fe dan P occluded). Genotype 19BE had mechanism through translocation of carbon to root or decreasing of shoot-root ratio; specific P absortion (P-Al dan P-Fe) was limited. Genotype 25EC had only decreased shoot-root ratio and P-Fe absortion mechanism. Fertilization with high P (400 mg kg-1) increased biomass production, number of root nodules, absortion N and P nutrients; however it decreased absorption alkaline-phosphatase activity at soybean rhizosphere at 35 day after planting. Fertilizing high dosage P created biopriming by decreasing the qualtity specific P on soil under 19BE and 25EC genotypes.Keywords : adaptation mechanism, soybean genotypes, acid soil, P acquisition

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Rhizosphere bacteria induced by aluminum-tolerant and aluminum-sensitive soybeans in acid soil

Plant Soil and Environment ◽

10.17221/652/2011-pse ◽

2012 ◽

Vol 58 (No. 6) ◽

pp. 262-267 ◽

Cited By ~ 2

Author(s):

T. Yang ◽

Y. Ding ◽

Y. Zhu ◽

Y. Li ◽

X. Wang ◽

...

Keyword(s):

Citric Acid ◽

Organic Acid ◽

Microbial Communities ◽

Malic Acid ◽

Rhizosphere Soil ◽

Acid Soil ◽

Rhizosphere Bacteria ◽

Organic C ◽

Community Function ◽

Soybean Genotypes

Rhizosphere microbial communities play a major role in multiple soil functions. The aim of this study is to assess the relation of bacteria and organic acids in rhizosphere soil and community function induced by soybean genotypes, BX10 [aluminum (Al)-tolerant soybean] and BD2 (Al-sensitive soybean). Organic acid analysis in the rhizosphere soil indicates that BX10 increased the concentration of citric acid, whereas BD2 decreased it; malic acid was only found in the rhizosphere soil of BX10. Redundancy analysis results also showed that the two soybean genotypes induced distinct rhizosphere microbial communities, and citric acid and malic acid had a significantly positive correlation with rhizosphere bacteria of BX10. The community level physiological profiling showed that BX10 might have more influence than BD2 on the ability to metabolize organic C substrates. Sequence analysis indicates that two soybeans stimulate some rhizobacteria, such as species of Acinetobacter, Candidatus Amoebinatus, and uncultured proteobacterium. This study revealed that rhizobacteria of two soybeans may be related to their organic acid exudation.    

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Differential responses of the diazotrophic community to aluminum-tolerant and aluminum-sensitive soybean genotypes in acidic soil

European Journal of Soil Biology ◽

10.1016/j.ejsobi.2012.09.004 ◽

2012 ◽

Vol 53 ◽

pp. 76-85 ◽

Cited By ~ 11

Author(s):

Yongchun Li ◽

Tongyi Yang ◽

Peipei Zhang ◽

Ailan Zou ◽

Xin Peng ◽

...

Keyword(s):

Acidic Soil ◽

Soybean Genotypes ◽

Differential Responses ◽

Diazotrophic Community

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Responses of soybean genotypes to intercropping with maize in the Southern Guinea Savanna, Nigeria

Acta Agronomica Hungarica ◽

10.1556/aagr.52.2004.2.6 ◽

2004 ◽

Vol 52 (2) ◽

pp. 157-163

Author(s):

C. U. Egbo ◽

M. A. Adagba ◽

D. K. Adedzwa

Keyword(s):

Seed Yield ◽

Block Design ◽

Field Trials ◽

Yield Response ◽

Ecological Zone ◽

Land Equivalent Ratio ◽

Guinea Savanna ◽

Days To Maturity ◽

Soybean Genotypes ◽

Location Interaction

Field trials were conducted in the wet seasons of 1997 and 1998 at Makurdi, Otukpo and Yandev in the Southern Guinea Savanna ecological zone of Nigeria to study the responses of ten soybean genotypes to intercropping. The experiment was laid out in a randomised complete block design. The genotypes TGX 1807-19F, NCRI-Soy2, Cameroon Late and TGX 1485-1D had the highest grain yield. All the Land Equivalent Ratio (LER) values were higher than unity, indicating that there is great advantage in intercropping maize with soybean. The yield of soybean was positively correlated with the days to 50% flowering, days to maturity, plant height, pods/plant and leaf area, indicating that an improvement in any of these traits will be reflected in an increase in seed yield. There was a significant genotype × yield × location interaction for all traits. This suggests that none of these factors acted independently. Similarly, the genotype × location interaction was more important than the genotype × year interaction for seed yield, indicating that the yield response of the ten soybean genotypes varied across locations rather than across years. Therefore, using more testing sites for evaluation may be more important than the number of years.

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