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Genotypic Differences in Phosphorus Efficiency and the Performance of Physiological Characteristics in Response to Low Phosphorus Stress of Soybean in Southwest of China

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ABSTRACT

Southwest of China is one of the major soybean (Glycine max L.) production regions in China with low availability of soil phosphorus (P). Whereas little information is available on P-efficient soybean genotypes in this region, even though using P-efficient soybean genotypes is a sustainable P management strategy for enhancing yield and P use efficiency. To assess the genetic variation on P use efficiency, 274 soybean genotypes were employed to compare the yields and P acquisition potentials in the field. Additionally, 10 representational genotypes (5 P-efficient genotypes and 5 P-inefficient genotypes) were grown in hydroponic media containing low P treatment (0.05 mM L−1) and high P treatment (0.25 mM L−1) to further investigate P assimilation characteristics and the related mechanisms of P-efficient soybean genotypes. In the field trial, the models described the relationships between yield and seed P concentration (R2 = 0.85), shoot P accumulation (R2 = 0.84), HI (R2 = 0.82) well. The yield, seed P concentration and shoot P accumulation ranged from 5.5 to 36.0 g plant−1, from 0.045 to 0.93% and from 0.065 to 0.278 mg plant−1, respectively. In the hydroponic trial, P-efficient genotypes under low P treatment showed significantly better plant growth, P accumulation and root: shoot ratio than P-inefficient genotypes. Simultaneously, total root length, specific root length, root surface area and root volume of P-efficient were significantly greater than P-inefficient under low P treatment. Higher rate of organic acid exudation and acid phosphatase activities was observed in the P-efficient soybean genotypes under low P condition when compared to the P-inefficient soybean genotypes. It indicated that significant genetic variation for P use efficiency existed in this region, and the P-efficient soybean genotypes, especially E311 and E141, demonstrated great tolerance to P deficiency, which could be potential materials using in improving production and P use efficiency in low availability of soil P region.

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Related in: MedlinePlus

Activities of APase in roots of soybean genotypes grown in high and low P conditions in greenhouse. Data are mean of three replicates ± SE. (A) Root APase activities of P-efficient soybean genotypes. (B) Root APase activities of P-inefficient soybean genotypes. Different letters on each column are significantly different among soybean genotypes at the 5% level by LSD. *Indicates significantly different (p <0.05) between high and low P level.
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Figure 5: Activities of APase in roots of soybean genotypes grown in high and low P conditions in greenhouse. Data are mean of three replicates ± SE. (A) Root APase activities of P-efficient soybean genotypes. (B) Root APase activities of P-inefficient soybean genotypes. Different letters on each column are significantly different among soybean genotypes at the 5% level by LSD. *Indicates significantly different (p <0.05) between high and low P level.

Mentions: APase activity of root significantly increased in low P level compared to in high P condition (Figure 5). The root APase activities of P-efficient soybean genotypes ranged from 27.8 to 54.21 pNP ug (g FW)−1 min−1, and the average was 42.1 pNP ug (g FW)−1 min−1 in low P level (Figure 5A). The corresponding data of P-inefficient soybean genotypes ranging from 20.29 to 33.09 pNP ug (g FW)−1 min−1 was averaged by 24.1 pNP ug (g FW)−1 min−1 in low P level (Figure 5B). The maximum APase activities of E311 and E141 reached 52.15 and 54.21 pNP ug (g FW)−1 min−1 in low P level, respectively, and were 1.2~2.3-fold higher than others (Figure 5A). D55 and E277-1 showed higher APase activities in low P condition than the E108, E150, and E283 in high P level (Figure 5B).


Genotypic Differences in Phosphorus Efficiency and the Performance of Physiological Characteristics in Response to Low Phosphorus Stress of Soybean in Southwest of China
Activities of APase in roots of soybean genotypes grown in high and low P conditions in greenhouse. Data are mean of three replicates ± SE. (A) Root APase activities of P-efficient soybean genotypes. (B) Root APase activities of P-inefficient soybean genotypes. Different letters on each column are significantly different among soybean genotypes at the 5% level by LSD. *Indicates significantly different (p <0.05) between high and low P level.
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Related In: Results  -  Collection

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Figure 5: Activities of APase in roots of soybean genotypes grown in high and low P conditions in greenhouse. Data are mean of three replicates ± SE. (A) Root APase activities of P-efficient soybean genotypes. (B) Root APase activities of P-inefficient soybean genotypes. Different letters on each column are significantly different among soybean genotypes at the 5% level by LSD. *Indicates significantly different (p <0.05) between high and low P level.
Mentions: APase activity of root significantly increased in low P level compared to in high P condition (Figure 5). The root APase activities of P-efficient soybean genotypes ranged from 27.8 to 54.21 pNP ug (g FW)−1 min−1, and the average was 42.1 pNP ug (g FW)−1 min−1 in low P level (Figure 5A). The corresponding data of P-inefficient soybean genotypes ranging from 20.29 to 33.09 pNP ug (g FW)−1 min−1 was averaged by 24.1 pNP ug (g FW)−1 min−1 in low P level (Figure 5B). The maximum APase activities of E311 and E141 reached 52.15 and 54.21 pNP ug (g FW)−1 min−1 in low P level, respectively, and were 1.2~2.3-fold higher than others (Figure 5A). D55 and E277-1 showed higher APase activities in low P condition than the E108, E150, and E283 in high P level (Figure 5B).

View Article: PubMed Central - PubMed

ABSTRACT

Southwest of China is one of the major soybean (Glycine max L.) production regions in China with low availability of soil phosphorus (P). Whereas little information is available on P-efficient soybean genotypes in this region, even though using P-efficient soybean genotypes is a sustainable P management strategy for enhancing yield and P use efficiency. To assess the genetic variation on P use efficiency, 274 soybean genotypes were employed to compare the yields and P acquisition potentials in the field. Additionally, 10 representational genotypes (5 P-efficient genotypes and 5 P-inefficient genotypes) were grown in hydroponic media containing low P treatment (0.05 mM L&minus;1) and high P treatment (0.25 mM L&minus;1) to further investigate P assimilation characteristics and the related mechanisms of P-efficient soybean genotypes. In the field trial, the models described the relationships between yield and seed P concentration (R2 = 0.85), shoot P accumulation (R2 = 0.84), HI (R2 = 0.82) well. The yield, seed P concentration and shoot P accumulation ranged from 5.5 to 36.0 g plant&minus;1, from 0.045 to 0.93% and from 0.065 to 0.278 mg plant&minus;1, respectively. In the hydroponic trial, P-efficient genotypes under low P treatment showed significantly better plant growth, P accumulation and root: shoot ratio than P-inefficient genotypes. Simultaneously, total root length, specific root length, root surface area and root volume of P-efficient were significantly greater than P-inefficient under low P treatment. Higher rate of organic acid exudation and acid phosphatase activities was observed in the P-efficient soybean genotypes under low P condition when compared to the P-inefficient soybean genotypes. It indicated that significant genetic variation for P use efficiency existed in this region, and the P-efficient soybean genotypes, especially E311 and E141, demonstrated great tolerance to P deficiency, which could be potential materials using in improving production and P use efficiency in low availability of soil P region.

No MeSH data available.


Related in: MedlinePlus