What regulates the rhizodeposition of winter oilseed rape during growth?

Abstract

Purpose The goal of this work was to contribute to a better understanding of the process of rhizodeposition in crops and to find helpful approaches for creating a simple model of rhizodeposition. For this purpose, we tested three hypotheses about the relationships and changes in the relative C partitioning coefficients and their ratios. In particular, we analyzed the relationships between root growth, belowground respiration, rhizodeposition and other traits during plant growth. Methods The ranges of variation in $$^{14}$$ 14 C partitioning coefficients and various plant traits were determined after $$^{14}$$ 14 C labeling of four winter oilseed rape genotypes in three developmental stages. Result For all genotypes, we found very strong and significant correlations between the percentages of freshly assimilated C used for rhizodeposition and root growth. In addition, we showed that the ratios of the relative $$^{14}$$ 14 C fluxes in the root-soil-soil gas system changed significantly during plant development and that the relative and absolute C fluxes of rhizodeposition followed different trends. The root growth rate and the change in the ratio of the percentages of $$^{14}$$ 14 C in rhizodeposition and root tissue over time were the key factors that determined the absolute amount of rhizodeposited C. We also found that the C partitioning in a taproot system leading to root growth and rhizodeposition was similar to that of an adventitious root system. Conclusion Based on our results, we conclude that using the identified key factors in combination with a root growth model, a simple model can be generated to describe rhizodeposition.

Impact ofPGPRinoculation on root morphological traits and root exudation in rapeseed and camelina: interactions with heat stress

“…Indeed, the initial beneficial effect on root morphology seemed to be lost over time (Figure 3B). This could be accounted for by the fact that plants have reached reproductive stage and then have lesser benefit in developing the root surface exchange (Keith, Oades and Martin, 1986; Remus, Pandey and Lüttschwager, 2022). This assumption is also supported by the observed strong decrease in exuded C and N compared to the other sample times (Figure 5B; Chaparro et al, 2013; Tang et al, 2021).…”

Phosphorus HotSpots in Crop Plants Production on the Farm—Mitigating Critical Factors

“…In the case of cruciferous plants, three interacting types of adaptation should probably be considered. These plants can be classified as morphologically adapted as indicated by their large, extensive root systems [Table 1; [67]]. Moreover, the roots of these plants release organic compounds into the soil, in turn inducing the activity of soil microorganisms [68].…”