Topsoil Foraging and Its Role in Plant Competitiveness for Phosphorus in Common Bean

By G. Rubio, H. Liao, Xiaolong Yan, J. Lynch. Crop science, 2003

121 citations recorded by the source corpus.

We evaluated the effect of root shallowness on interplant competition for phosphorus in common bean (Phaseolus vulgaris L.). Recombinant inbred lines (RILs) segregating for basal root gravitropism were evaluated in monogenetic and polygenetic stands with varying phosphorus availability in the field in South China and in solution culture and solid media in controlled environments. In the field, shallow-rooted RILs were more productive than deep-rooted RILs. Shoot biomass of these RILs almost doubled the deep-rooted ones when in competition. In the greenhouse, three treatments representing different soil phosphorus distributions were compared. Root shallowness did not confer any competitive advantage when phosphorus availability was uniformly low or uniformly high, but did confer a competitive advantage when phosphorus availability was concentrated in the topsoil. Shallow and deep-rooted RILs did not differ in response to phosphorus availability in solution culture where phosphorus is mixed and uniformly available. Our results demonstrate that basal root gravitropism, which is a specific root architectural trait under genetic control, is important for belowground competition in low phosphorus soils.

Subfields: Agronomy and Crop Science, Plant Science

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Citations in the corpus

Plant and microbial strategies to improve the phosphorus efficiency of agriculture (2011, background): “Root architectural traits, themselves, may interact to alter the extent of inter-root competition, which is an important component of overall root foraging efficiency (Ge et al. 2000; Rubio et al. 2003; Rubio et al. 2001; Walk et al. 2006).”
Measuring root traits in barley (Hordeum vulgare ssp. vulgare and ssp. spontaneum) seedlings using gel chambers, soil sacs and X-ray microtomography (2009, background): “Root architectural traits are important for the selection of crops and cultivars that are most efficient in the acquisition of specific nutrients from soil (Lynch and Brown 2001; Rubio et al. 2003), and in water-limited environments (Manschadi et al. 2006).”
ROOT STRATEGIES FOR PHOSPHORUS ACQUISITION (2008, background): “For example, bean genotypes with shallow basal roots out-compete genotypes with deep basal roots in low P fields (Rubio et al. 2003), because of enhanced topsoil exploitation and reduced competition among roots of the same plant (Rubio et al.”
Combining a modelling with a genetic approach in establishing associations between genetic and physiological effects in relation to phosphorus uptake (2005, background): “In such uniform soil, topsoil foraging was not found to offer advantages (Rubio et al., 2003).”
Breeding beans for resistance to terminal drought in the Lowland tropics (2005, background): “tion (Rubio et al., 2003).”
Acquisition of phosphorus and other poorly mobile nutrients by roots. Where do plant nutrition models fail? (2011, background): “…water uptake (Doussan et al. 1998, 1999, 2003, 2006; Pagès et al. 2004; Pierret et al. 2007), localizing nutrient uptake zones or describing situations of heterogeneous distribution of nutrients in the soil profile (Ge et al. 2000; Liao et al. 2001; Lynch and Brown 2001; Rubio et al. 2003).”
Novel approaches in plant breeding for rhizosphere-related traits (2009, background): “These include enhancing density or length of root hairs (Gahoonia and Nielsen 2004), modifications in root architecture to preferentially concentrate root biomass in soil strata containing the maximum amount of a limiting nutrient (Rubio et al. 2003), and ways to maintain new root development with m”
Roots of the Second Green Revolution (2007, background): “For example, bean genotypes with shallow basal roots outcompete genotypes with deep basal roots in low-phosphorus fields (Rubio et al. 2003), because of enhanced topsoil exploitation and reduced competition (i.e. reduced overlap of phosphorus-depletion zones) among roots of the same plant (Rubio et…”
Rhizoeconomics: Carbon costs of phosphorus acquisition (2005, background): “As a nutrient resource becomes increas- ingly limiting, economic considerations are simplified as acquisition and retention of the limiting nutrient override other concerns, and the ‘Law of the Minimum’ holds sway (see references in Rubio et al., 2003b).”
Shovelomics: high throughput phenotyping of maize (Zea mays L.) root architecture in the field (2011, background): “When phosphorus was evenly distributed in the soil, root shallowness did not confer any competitive advantage in common beans (Rubio et al. 2003).”
Acquisition of phosphorus and nitrogen in the rhizosphere and plant growth promotion by microorganisms (2009, background): “…2006), increased root branching and root angle particularly in surface soils and nutrient rich regions (Lynch and Brown 2001; Manske et al. 2000; Rubio et al. 2003), high specific root length (i.e. length per unit mass or root fineness; Silberbush and Barber, 1983), the presence of root hairs…”
Architectural Tradeoffs between Adventitious and Basal Roots for Phosphorus Acquisition (2005, background): “…of phosphorus acquisition are similar to phosphorus content of common bean reported in field studies (Miller et al., 2003; Yan et al., 1995b), as well as amounts that can be calculated from other field and greenhouse experiments (Nielsen et al. 1998b; Snapp and Lynch, 1996; Rubio et al., 2003a).”