The relationship between root length density and yield in rice plants.

Morita, Shigenori; Suga, Tetsuya; Yamazaki, Koou

doi:10.1626/jcs.57.438

Cited by 37 publications

(18 citation statements)

References 2 publications

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“…However, there is little clear evidence to support this assumption, because root length is known to vary greatly even within the same crop. For example, Morita et al (1988) reported that maximum RLD within the plow layer in rice was 8.8 cm cm −3 , whereas according to Murakami and Yoneyama (1988) it was 16-270 cm cm −3 . For other cereals, it has been reported to be 4 cm cm −3 (Mengel and Barber 1974) or 7 cm cm −3 (Nakamoto et al 1992) in maize, 8 cm cm −3 in wheat (Welbank et al 1974), and 10 cm cm −3 in sorghum (Gardner 1964).…”

Section: Comparison Of Root Systems Of Potato and Other Field Cropsmentioning

confidence: 99%

Physiology of the Potato: New Insights into Root System and Repercussions for Crop Management

2008

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Potato roots are concentrated mostly in the plow layer up to 30 cm in soil depth. Some roots extend up to 100 cm depth and the total root length throughout the soil profile reaches about 10-20 km m −2 area. There are large differences in root mass (dry weight and length) in the plow layer between cultivars, breeding lines and wild relatives. The differences are generally stable across different environmental conditions, such as locations with different soil types, fertilizer rates and planting densities. Under favourable environmental conditions without severe shortage of water and nutrients, root mass differences between genotypes are related to maturity class: late genotypes continue root growth longer, and attain larger root mass and deeper rooting than early genotypes. Differences in root mass become clear at the start of flowering, much earlier than differences in shoot mass. Root mass is negatively correlated with early tuber bulking. However, root mass generally shows positive correlations with shoot mass and final tuber yield. Differences in root mass also exist amongst genotypes of the same maturity class. Using root mass in the plow layer and tuber yield as selection criteria, Konyu cultivars were bred in Japan. They showed significantly less reduction of leaf conductance and photosynthesis, leaf area and tuber yield than commercial cultivars under dry soil conditions. To assist breeding for root characters, new methods have been developed to assess the ability of roots to penetrate into hard soil layers using pots with paraffin-vaseline discs and the ability to absorb under low water potential in vitro. Physiological research on root characteristics contributed in the past, and will continue to do so in the future, to the development of new cultivars with high drought tolerance and to the improvement of irrigation practice.

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Section: Comparison Of Root Systems Of Potato and Other Field Cropsmentioning

confidence: 99%

Physiology of the Potato: New Insights into Root System and Repercussions for Crop Management

2008

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“…In such a system, rice develops a deeper root system and maintains its activity to later growth stages as discussed already, which might facilitate uptake of slowly mineralized N at later stages. There is also the suggestion that high-yielding rice had a deeper root system (Kawata et al, 1978;Morita et al, 1988), but the exact mechanism for this is the subject of further studies.…”

Section: Production Technologies Toward Increased Yield In Irrigated mentioning

confidence: 99%

Can Yields of Lowland Rice Resume the Increases that They Showed in the 1980s?

Horie¹,

Shiraiwa²,

Homma³

et al. 2005

Plant Production Science

168

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“…As the row and hill spacing are usually 30 cm and 15 cm respectively, cylindrical monoliths 15 cm in diameter were taken at two locations -one including a rice hill at the center and the other at the mid-point between four neighboring hills (Morita et al, 1988). The monoliths were sliced with 5 or 10 cm increments of soil depth, and the length and/or weight of roots in each soil block were measured.…”

Section: Growth Direction Of Nodal Roots and The Spatial Distributionmentioning

confidence: 99%

“…It was shown that high-yielding rice plants often had a large proportion of downward-growing nodal roots, which usually developed well in relatively deep layers (Morita et al, 1986(Morita et al, , 1988. Moreover, lodging resistance of rice plants partly depends on the rooting depth in the soil (Terashima et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Growth direction of nodal roots in rice: its variation and contribution to root system formation

Abe

Morita

1994

Plant Soil

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The root system of a rice plant (Oryza sativa L.) consists of numerous nodal roots and their laterals. The growth direction of these nodal roots affects the spatial distribution of the root system in soil, which seems to relate to yield and lodging resistance. The growth angle of a nodal root varies with the type and timing of emergence of the nodal root. The body of a rice plant can be recognized as an integrated set of shoot units, each unit consisting of an internode with a leaf and several roots. Nodal roots formed at the apical part of a shoot unit often elongate horizontally, whereas those formed at the basal part of the shoot unit show various growth directions depending on both the growth stages of the plant and the environmental conditions. Moreover, nodal roots that emerge from the most basal shoot unit of a tiller are usually thick and grow downwards. External factors such as planting density and nitrogen application affect the growth direction of nodal roots, probably partly because of the changing tillering pattern of the shoot. In addition to the growth angle of nodal roots, size of nodal roots may be another important factor determining the spatial distribution of the root system in soil.

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The relationship between root length density and yield in rice plants.

Cited by 37 publications

References 2 publications

Physiology of the Potato: New Insights into Root System and Repercussions for Crop Management

Physiology of the Potato: New Insights into Root System and Repercussions for Crop Management

Can Yields of Lowland Rice Resume the Increases that They Showed in the 1980s?

Growth direction of nodal roots in rice: its variation and contribution to root system formation

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