Quantitative analysis on root system structures of upland rice and maize.

Yamauchi, Akira; Kono, Yasuhiro; Tatsumi, Jiro

doi:10.1626/jcs.56.608

Cited by 78 publications

(52 citation statements)

References 11 publications

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“…Lateral roots occupy a great proportion in the total length of the root system (Yamauchi et al, 1987b), and are responsible for a large portion of water extracted by the whole root system (Varney et al, 1993). The responses of roots to drought stress differed between The θ is represented by degree of defl ection from the soil surface, that is, the bigger the growth angle, the deeper the nodal roots elongate vertically.…”

Section: Discussionmentioning

confidence: 99%

Development and Distribution of Root System in Two GrainSorghum Cultivars Originated from Sudan under Drought Stress

Tsuji

Inanaga

Araki

et al. 2005

Plant Production Science

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Abbreviations : BI, branching index; RLD, root length density; SDW, shoot dry weight; SRL, specifi c root length; TRL, total root length; VWC, volumetric water content; θ, growth angle of nodal roots; θ m , mean growth angle of nodal roots; Ψ L , leaf water potential. Agriculture, Yamaguchi University, 1677-1, Yoshida, Yamaguchi,753-8515, Japan; 3 Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Nishitokyo, Tokyo, Japan) Abstract : The difference in rooting pattern between two grain sorghum cultivars differing in drought tolerance was investigated under drought stress. The cultivars, Gadambalia (drought-tolerant) and Tabat (droughtsusceptible), were grown in bottomless wooden or acrylic root boxes to examine root parameters. Gadambalia consistently exhibited higher dry matter production and leaf water potential than Tabat under drought stress in both root boxes. In the experiment with wooden root boxes, under a drought condition, Gadambalia extracted more water from deep soil layers (1.1-1.5 m), which was estimated from the reduction in soil water content, than Tabat. This was because Gadambalia had a signifi cantly higher root length density in these soil layers. The high root length density was due to enhanced lateral root development in Gadambalia. In the other experiment with acrylic root boxes, though total root length in the upper soil layer (0-0.5 m) was declined by limited irrigation in both cultivars, the reduction in Gadambalia was moderate compared with that in Tabat owing to the maintenance of fi ne root growth. Unlike Tabat, Gadambalia had an ability to produce the nodal roots from higher internodes even under drought, which resulted in the high nodal root length of Gadambalia. The growth angle of nodal roots was signifi cantly correlated with root diameter, and the nodal roots from the higher internodes had large diameters and penetrated into the soil more vertically. These results indicate that the responses of roots (i.e. branching and/or growth of lateral root, and nodal root emergence from higher internodes) to soil dryness could be associated with the drought tolerance of Gadambalia. Development and Distribution of Root System in Two Grain

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Section: Discussionmentioning

confidence: 99%

Development and Distribution of Root System in Two GrainSorghum Cultivars Originated from Sudan under Drought Stress

Tsuji

Inanaga

Araki

et al. 2005

Plant Production Science

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“…The maximum diameter of the root-hairs could reach 18 ± 2 f.1m in rye (Baon et al 1994). On the other hand, the average diameter of thin roots other than root hairs was, for example, 85 to 90 f.1m in tertiary roots of oats and Kentucky bluegrass (Dittmer 1938), 80 f.1m in short primary lateral roots of upland rice (Yamauchi et al 1987) and 75 f.1m in lateral roots of irrigated rice (Sasaki et al 1981). It should be noted that all these data were obtained from washed samples.…”

Section: Discussionmentioning

confidence: 99%

Measurement of root diameter in field-grown crops under a microscope without washing

Yamaguchi

2002

Soil Science and Plant Nutrition

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The variation in the root diameter of field-grown crops was directly measured under a microscope by manually removing soil particles from roots without washing the roots. The frequency of the root diameter at the mode (about 10 /-Lm, mainly of root hairs) was higher in wheat and maize (about 60%) than in soybean and sugar beet (about 30%), and it was the lowest in potato (21%). The diameter of 88 to 97% of the roots larger than 20/-Lm ranged from 21 to 160/-Lm. The finer the roots, the higher was the frequency, except for potato roots in which the frequency of roots with a diameter of 21 to 40, 41 to 80, and 81 to 160 /-Lm was about 30%. Since fine roots and root hairs account for the largest proportion of the crop root system, they should appropriately be quantified whenever morphological and physiological aspects of roots are analyzed.

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“…D was varied with the developmental system of root axes and laterals of genotype (Lynch and van Beem, 1994), with plant age various orders (Kono et aL, 1987a;, (Fitter and Stickland, 1992;Tatsumi, 1996;Tatsumi 1987) , has been widely applied. Fitter (1991) introduced andTakagai, 1997), and with growth conditions (Eghthe topological model based upon the link system, a link ball et al, 1993;Tatsumi and Takagai, 1997).…”

Section: May Have the Potential To Describe Distribution Andmentioning

confidence: 99%

Local Fractal Dimensions and Multifractal Analysis of the Root System of Legumes

Ketipearachchi

Tatsumi

2000

Plant Production Science

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Quantitative analysis on root system structures of upland rice and maize.

Cited by 78 publications

References 11 publications

Development and Distribution of Root System in Two GrainSorghum Cultivars Originated from Sudan under Drought Stress

Development and Distribution of Root System in Two GrainSorghum Cultivars Originated from Sudan under Drought Stress

Measurement of root diameter in field-grown crops under a microscope without washing

Local Fractal Dimensions and Multifractal Analysis of the Root System of Legumes

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