The authors of this study have designed a nutrient root-feeding system that minimizes and regulates nutrient and water supply without loss of crop yields in a space greenhouse.
The root surface and the region immediately surrounding a root, constitutes an ecological niche in soil where nutrients (root exudates) are more readily available.
Figure 2 and Table 2 show that the growth of shoots was clearly suppressed after 8 days of culture in the LP nutrient solution, whereas root growth was promoted, especially that of primary roots.
Consistent with our results, when low P concentrations were maintained by renewing the nutrient solution, lateral root elongation was reduced in maize at the V5 V9 stage, despite an increased root to shoot ratio (Mollier and Pellerin 1999).
Seedlings grown with or without aeration were transferred to a LN nutrient solution and roots were collected for gene expression analysis at 0, 0.5, 2, 6, 12, 24 and 48 h.
It provides a buffering reservoir of nutrient solution in the root zone, while maintaining an adequate volume of air (oxygen).
To maintain the nutrient concentration around the roots constant, the root bed was percolated with 300 mL of nutrient solution per 1 L of root-bed volume and day.
Increase in atmospheric relative humidity (RH), the inevitable result of more frequent rainfall events, will reduce water loss through transpiration [ 4, 5], and affect both the delivery of nutrients to root absorbing surface and nutrient uptake by trees due to diminished water fluxes through the vegetation [ 6, 7].
They have long been recognized as plant growth-promoting substances, particularly with regard to influencing nutrient uptake, root growth and architecture.
Nutrient and root space competition as well as limited light access in a rapidly converging canopy often result in growth-rate decline, with weaker individuals dying when their leaves no longer receive enough light to maintain positive carbon balance.
Nevertheless, the production of a genomic library enabled identification of certain functions related to nutrient uptake, root colonization (Ruiz-Lozano and Bonfante, 2000), and nitrogenase activity (Minerdi et al., 2001).
