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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

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−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.

No MeSH data available.


Relationship between soybean yield and seeds P concentration (A), shoot P uptake (B), HI (C). Date are mean of three replicates. The horizontal dotted line in figures (A–C) means soybean seeds P content, shoot P uptake and HI among the genotypes, respectively. The vertical dotted lines in figures (A–C) were representing the soybean yield of Nandou 12 in Sichuan province (20 g plant−1).
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Figure 2: Relationship between soybean yield and seeds P concentration (A), shoot P uptake (B), HI (C). Date are mean of three replicates. The horizontal dotted line in figures (A–C) means soybean seeds P content, shoot P uptake and HI among the genotypes, respectively. The vertical dotted lines in figures (A–C) were representing the soybean yield of Nandou 12 in Sichuan province (20 g plant−1).

Mentions: Significant variation existed in grain yield among the 274 soybean genotypes in field experiment (Table S2). Average yield of 274 soybean genotypes ranging from 5.6 to 36.0 g plant−1 was 16.5 g plant−1. Seed P concentration and shoot P accumulation showed significant response to yield. Moreover, the linear-plateau model described the relationship between yield and HI well (R2 = 0.82) (Figure 2).


Genotypic Differences in Phosphorus Efficiency and the Performance of Physiological Characteristics in Response to Low Phosphorus Stress of Soybean in Southwest of China
Relationship between soybean yield and seeds P concentration (A), shoot P uptake (B), HI (C). Date are mean of three replicates. The horizontal dotted line in figures (A–C) means soybean seeds P content, shoot P uptake and HI among the genotypes, respectively. The vertical dotted lines in figures (A–C) were representing the soybean yield of Nandou 12 in Sichuan province (20 g plant−1).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5121124&req=5

Figure 2: Relationship between soybean yield and seeds P concentration (A), shoot P uptake (B), HI (C). Date are mean of three replicates. The horizontal dotted line in figures (A–C) means soybean seeds P content, shoot P uptake and HI among the genotypes, respectively. The vertical dotted lines in figures (A–C) were representing the soybean yield of Nandou 12 in Sichuan province (20 g plant−1).
Mentions: Significant variation existed in grain yield among the 274 soybean genotypes in field experiment (Table S2). Average yield of 274 soybean genotypes ranging from 5.6 to 36.0 g plant−1 was 16.5 g plant−1. Seed P concentration and shoot P accumulation showed significant response to yield. Moreover, the linear-plateau model described the relationship between yield and HI well (R2 = 0.82) (Figure 2).

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−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.

No MeSH data available.