Cultivar Difference in the Response of Root System to Nitrogen Application in Rice Plant.

Lateral Roots: Random Diversity in Adversity

“…The abundant literature on lateral roots plasticity, certainly biased towards Arabidopsis seedlings, implicitly assumes the existence of a unique lateral root type which responds to environmental cues, leading to a range of lateral roots phenotypes (reaction norms). However, careful observations have shown that different lateral root types do not respond similarly to the same variation of their substrate [99], [100] and that their responses are affected by genotype-by-environment interactions [19]. From an evolutionary perspective, a root system comprising different types of lateral roots whose proportions and behaviour can be modulated in type-specific manners benefits from many more degrees of freedom than a root system made of lateral roots that respond all in the same way (Fig 5E-F).…”

Genotypic Variation in Response of Rainfed Lowland Rice to Drought and Rewatering

“…Root length was determined by the COMAIR Root Length Scanner (Hawker De Havilland Victoria Limited, Australia) for each soil layer. Specific root length, considered to represent the extent of root branching (Tanaka et al, 1993), was calculated as root length per unit root dry mass. Root thickness was measured by micrometer in experiment 3 at 0-10, 20-30, and 40-50 em layers for seven to ten randomly chosen nodal roots.…”

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

“…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., ).…”

“…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, ).…”