Root System Morphology of Four Rice Cultivars: Response of Different Component Roots to Nitrogen Application.

Tanaka, Saneaki; Yamauchi, Akira; Kono, Yasuhiro

doi:10.1626/jcs.64.148

Cited by 14 publications

(8 citation statements)

References 7 publications

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“…Higher N supply typically generates more tillers and roots on tillers, and also accelerates root growth and branching [45, 46]. This study showed the similar results on root length and surface area.…”

Section: Discussionsupporting

confidence: 71%

Quantitative Classification of Rice (Oryza sativa L.) Root Length and Diameter Using Image Analysis

et al. 2017

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Quantitative study of root morphological characteristics of plants is helpful for understanding the relationships between their morphology and function. However, few studies and little detailed and accurate information of root characteristics were reported in fine-rooted plants like rice (Oryza sativa L.). The aims of this study were to quantitatively classify fine lateral roots (FLRs), thick lateral roots (TLRs), and nodal roots (NRs) and analyze their dynamics of mean diameter (MD), lengths and surface area percentage with growth stages in rice plant. Pot experiments were carried out during three years with three rice cultivars, three nitrogen (N) rates and three water regimes. In cultivar experiment, among the three cultivars, root length of ‘Yangdao 6’ was longest, while the MD of its FLR was the smallest, and the mean diameters for TLR and NR were the largest, the surface area percentage (SAP) of TLRs (SAPT) was the highest, indicating that Yangdao 6 has better nitrogen and water uptake ability. High N rate increased the length of different types of roots and increased the MD of lateral roots, decreased the SAP of FLRs (SAPF) and TLRs, but increased the SAP of NRs (SAPN). Moderate decrease of water supply increased root length and diameter, water stress increased the SAPF and SAPT, but decreased SAPN. The quantitative results indicate that rice plant tends to increase lateral roots to get more surface area for nitrogen and water uptake when available assimilates are limiting under nitrogen and water stress environments.

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Section: Discussionsupporting

confidence: 71%

Quantitative Classification of Rice (Oryza sativa L.) Root Length and Diameter Using Image Analysis

et al. 2017

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“…2010). Similarly, in rice seedlings grown in substrate, an increase in the ratio of LR that further branch compared with LRs that do not branch was observed in response to LN (Tanaka, Yamauchi & Kono 1995). Though very limited data are available on finely branched cereal roots, together, these results suggest that fine roots may play a more significant role in resource acquisition in cereals than previously appreciated and should not be omitted from nutrient studies.…”

Section: Discussionmentioning

confidence: 93%

Novel temporal, fine‐scale and growth variation phenotypes in roots of adult‐stage maize (Zea mays L.) in response to low nitrogen stress

Gaudin

McClymont

Holmes

et al. 2011

Plant Cell & Environment

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There is interest in discovering root traits associated with acclimation to nutrient stress. Large root systems, such as in adult maize, have proven difficult to be phenotyped comprehensively and over time, causing target traits to be missed. These challenges were overcome here using aeroponics, a system where roots grow in the air misted with a nutrient solution. Applying an agriculturally relevant degree of low nitrogen (LN) stress, 30-day-old plants responded by increasing lengths of individual crown roots (CRs) by 63%, compensated by a 40% decline in CR number. LN increased the CR elongation rate rather than lengthening the duration of CR growth. Only younger CR were significantly responsive to LN stress, a novel finding. LN shifted the root system architectural balance, increasing the lateral root (LR)-to-CR ratio, adding~70 m to LR length. LN caused a dramatic increase in second-order LR density, not previously reported in adult maize. Despite the near-uniform aeroponics environment, LN induced increased variation in the relative lengths of opposing LR pairs. Large-scale analysis of root hairs (RHs) showed that LN decreased RH length and density. Time-course experiments suggested the RH responses may be indirect consequences of decreased biomass/demand under LN. These results identify novel root traits for genetic dissection.

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“…Assessment of the entire root system of rice cultivars by Tanaka et al. (, ) under different N concentration and growth stage indicated that increased amount of nitrogen enhanced root production, but their elongation was inhibited. Also, our previous study on the effects of low nitrogen content on seminal root length indicated the presence of natural variation among wheat genotypes (Górny et al., ; Grzesiak et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…Proper nitrogen soil content is required to achieve high yield but for root growth low or high nitrogen content may be a stress factor. Many authors have reported that highly branched roots show better efficiency in capturing mobile and immobile ions from soil and that effective nutrient acquisition depends on the root number, length, branching and density in the soil (Guo et al., ; Ogawa et al., ; Tanaka, Yamauchi, & Kono, , ; Yamauchi, ).…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the seedlings of two maize hybrids and two triticale breeding forms (sensitive and resistant to soil density stress) were grown in the soil of low (L D ) and high (H D ) density and under poor [P N ]) and high (H N ) concentrations. Thus, soil density combined with poor or high dose of nitrogen represented different environmental stresses occurring in the field Laine, Ourry, and Boucaud (), Tanaka et al., ; Ishaq, Ibrahim, Hassan, Saaeed, & Lal, ; Ogawa et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Influence of nitrogen deficiency or excess on a root system structure of maize and triticale seedlings grown under low and high soil density

Grzesiak

Hura

Grzesiak

et al. 2017

J Agronomy Crop Science

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Responses of maize and triticale seedlings, differing in the susceptibility to soil density stress, and grown under low (LD) or high (HD) soil density and poor (PN), high (HN) or control (CN) nitrogen content in soil were investigated in relation to changes in physiological parameters—dry matter of shoot (S), root (R), shoot to root ratio (S/R), relative growth ratio of shoot and root (RGR), chlorophyll content (SPAD), total roots number and length (TRN, TRL), root penetration ability (RPA) and ratio of deep rooting (RDR). The seedlings grown under high soil density (HD) and control N‐soil content (CN) in comparison with LD and CN treatments showed a decrease in all measured parameters. Under poor and high nitrogen content, changes in the traits were higher for triticale than for maize. Higher differences between resistant and sensitive genotypes in TRN, TRL, RPA and RDR were observed particularly in the seedlings grown under HD treatment. Differences in parameters values between seedlings grown under control and nitrogen‐rich soil may be considered as a positive interaction between stresses. Our results suggest that the type of root structure (scattered, dimorphic) would be helpful in enhancing modelling and agronomic management for improved of plant stress tolerance.

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Root System Morphology of Four Rice Cultivars: Response of Different Component Roots to Nitrogen Application.

Cited by 14 publications

References 7 publications

Quantitative Classification of Rice (Oryza sativa L.) Root Length and Diameter Using Image Analysis

Quantitative Classification of Rice (Oryza sativa L.) Root Length and Diameter Using Image Analysis

Novel temporal, fine‐scale and growth variation phenotypes in roots of adult‐stage maize (Zea mays L.) in response to low nitrogen stress

Influence of nitrogen deficiency or excess on a root system structure of maize and triticale seedlings grown under low and high soil density

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