Carbon–Phosphorus Coupling Governs Microbial Effects on Nutrient Acquisition Strategies by Four Crops

Plants adjust root morphological and/or exudation traits in response to phosphorus (P) mobilization mediated by microorganisms. We hypothesized that straw application coupled with P fertilization would influence microbial P and then root nutrient-acquisition strategies related to crop growth. Root morphological (length and average diameter) and exudation traits (acid phosphatase and carboxylates) of Brassica chinensis, Solanum lycopersicum, Lactuca sativa, and Vigna unguiculata in response to microbial P dynamics were characterized in no-P and P-fertilized soil with/without straw addition. Straw addition increased the growth of fungi and bacteria, stimulating microbial P immobilization at day 24. The high microbial abundance was associated with four tested crops having short roots in straw-amended compared with no-straw soil at day 24. In straw-amended soil, B. chinensis and S. lycopersicum shifted toward root P-acquisition strategies based on fast elongation and strong carboxylate exudation from days 24 to 40. Such effective root P-acquisition strategies together with microbial P release increased shoot P content in S. lycopersicum in straw-amended compared with those without straw at day 40. Conversely, L. sativa and V. unguiculata produced short roots in response to the stable (or even increased) microbial P after straw addition till day 40. In straw-amended soil, high P application stimulated root elongation and carboxylate exudation in L. sativa and V. unguiculata, whereas carboxylate exudation by S. lycopersicum was decreased compared with the straw-amended but non-fertilized treatment at day 40. In summary, root P-acquisition strategies in response to microbial P differed among the tested crop species. Phosphorus fertilization needs to be highlighted when returning straw to enhance P-use efficiency in vegetable cropping systems. Copyright © 2022 Zhang, Zhang, Zhao, Xu, Cai, Zhu, Rengel and Kuzyakov.

Авторы
Zhang D. , Zhang Y. , Zhao Z. , Xu S. , Cai S. , Zhu H. , Rengel Z. , Kuzyakov Y.
Издательство
Frontiers Media S.A.
Язык
Английский
Статус
Опубликовано
Номер
924154
Том
13
Год
2022
Организации
  • 1 Institute of Ecological Environment Protection Research, Shanghai Academy of Agricultural Sciences, Shanghai, China
  • 2 Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai, China
  • 3 Nicholas School of the Environment, Duke University, Durham, NC, United States
  • 4 Soil Science and Plant Nutrition, UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia
  • 5 Institute for Adriatic Crops and Karst Reclamation, Split, Croatia
  • 6 Department of Soil Science of Temperate Ecosystems, University of Göttingen, Göttingen, Germany
  • 7 Department of Agricultural Soil Science, University of Göttingen, Göttingen, Germany
  • 8 Peoples Friendship University of Russia (RUDN University), Moscow, Russian Federation
  • 9 Institute of Environmental Sciences, Kazan Federal University, Kazan, Russian Federation
Ключевые слова
bacteria; crop P-use efficiency; fungi; phosphate-solubilizing microorganisms; root morphological and exudation traits; root–microbe interaction
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