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Different patterns of maize hybrids responses under variable phosphorus availability

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Abstract

In theory, the application of fertilizers is a relationship between the requirement of the crop and the content already present in the soil. However, in acidic soils, it is estimated that only 10–15% of the total phosphorus (P) applied is available to plants, requiring higher doses. As the importance of P in plants is notorious and unquestionable, being involved in the regulation of photosynthesis and plant development, there are several alternatives to increase its application efficiency. However, there is a lack of research that seeks to understand how different genotypes of the same species respond to different availability of P. The aim of this study was to evaluate the development of maize varieties under different conditions of P availability, thus bringing a new perspective for future studies that seek to increase the availability of P to plants. A randomized block experiment was carried out in a factorial scheme with five maize hybrids and five P availability, with four replications. The plants were evaluated for gas exchange, chlorophyll a fluorescence, chloroplast pigment content, shoot length and biomass accumulation. In low availability, there is a negative feedback control of photoassimilates export, which results in reduced photosynthesis, growth and biomass accumulation. This reduction in growth may also be associated with the hormonal control of plants. Despite the well-established relationship between photosynthesis and biomass accumulation, it is not always possible to establish a parallel between the two processes, depending on the genetic composition.

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Acknowledgements

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Fundação de Amparo à Pesquisa do Estado de Goiás (FAPEG) by financial support.

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Correspondence to L. A. Souza.

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Communicated by K. Rybka.

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Rodrigues, R.E., Neto, A.R., Jesus, L.S. et al. Different patterns of maize hybrids responses under variable phosphorus availability. Acta Physiol Plant 45, 113 (2023). https://doi.org/10.1007/s11738-023-03591-y

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  • DOI: https://doi.org/10.1007/s11738-023-03591-y

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