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The responses of root morphology and phosphorus-mobilizing exudations in wheat to increasing shoot phosphorus concentration.
Shen, Qi; Wen, Zhihui; Dong, Yan; Li, Haigang; Miao, Yuxin; Shen, Jianbo.
Afiliação
  • Shen Q; College of Resources and Environmental Science/Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing, China.
  • Wen Z; College of Resources and Environmental Science/Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing, China.
  • Dong Y; College of Resources and Environment, Yunnan Agricultural University, Kunming, China.
  • Li H; College of Resources and Environmental Science/Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing, China.
  • Miao Y; College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, China.
  • Shen J; College of Resources and Environmental Science/Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing, China.
AoB Plants ; 10(5): ply054, 2018 Oct.
Article em En | MEDLINE | ID: mdl-30338049
The adaptations of root growth and rhizosphere processes for soil phosphorus (P) acquisition have been investigated intensively in wheat (Triticum aestivum). However, only a few studies paid attention to these responses to shoot P status. This study aimed at investigating the responses of root morphology and P-mobilizing exudation to increasing shoot P concentration. A broad range of wheat shoot P concentrations (1.0-7.1 mg per g dry weight) was set up with 11 rates of P supply: 0-1200 mg P per kg soil. Root morphology and exudation parameters were measured after 37 days of plant growth. Shoot dry biomass reached a maximum when shoot P concentration was 4.63 mg per g dry weight. The maximum shoot P concentration for total root length, specific root length and the proportion of fine root (diameter ≤ 0.2 mm) length to total root length was 3 mg per g dry weight. Rhizosphere acidification was positively correlated with shoot P concentration when this was <5 mg per g dry weight. Shoot P concentration did not change acid phosphatase activity in the rhizosphere. Citrate concentration in the rhizosphere was suppressed by increasing shoot P concentration. In contrast, malate concentration in the rhizosphere showed a positive correlation with shoot P concentration. In conclusion, wheat root morphological and P-mobilizing exudation traits showed different behaviours with increasing P deficiency stress. Maintaining root biomass and length is the major strategy rather than root exudation for wheat to cope with extreme P deficiency.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: AoB Plants Ano de publicação: 2018 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: AoB Plants Ano de publicação: 2018 Tipo de documento: Article País de afiliação: China
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