Deep Rooted Rice Varieties Detected through the Observation of Root Characteristics Using the Trench Method.

Nemoto, Hiroshi; Suga, Ritsuo; Ishihara, Masatoshi; Okutsu, Yoshiaki

doi:10.1270/jsbbs1951.48.321

Cited by 30 publications

(29 citation statements)

References 2 publications

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“…Lemont, which is an improved irrigated lowland variety that can adapt to the upland ecosystem, has thick nodal roots and deep root characteristics (Kato et al, 2006). On the other hand, IRAT109, which is an upland japonica variety originally developed in the Ivory Coast, has a deep rooting trait and is often used as a drought-resistant donor in breeding programs (Ji et al, 2012;Nemoto et al, 1998).…”

Section: Experiments 1 Evaluation Of Plasticity In Deep Root Developmentmentioning

confidence: 99%

Drought-induced root plasticity of two upland NERICA varieties under conditions with contrasting soil depth characteristics

Menge

Kameoka

Kano‐Nakata

et al. 2016

Plant Production Science

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To identify differences in root plasticity patterns of two upland New Rice for Africa (NERICA) varieties, NERICA 1 and 4, in response to drought under conditions with contrasting soil profile characteristics, soil moisture gradients were imposed using a sloping bed system with depths ranging 30-65 cm and a line-source sprinkler system with a uniformly shallow soil layer of 20 cm depth. Varietal differences in shoot and root growths were identified only under moderate drought conditions, 11-18% v/v soil moisture content. Further, under moderate drought soil conditions where roots could penetrate into the deep soil layer, deep root development was greater in NERICA 4 than in NERICA 1, which contributed to maintaining dry matter production. However, under soil conditions with underground impediment to deep root development, higher shoot dry weight was noted for NERICA 1 than for NERICA 4 at 11-18% v/v soil moisture content, which was attributed to increased lateral root development in the shallow soil layer in NERICA 1. Enhanced lateral root development in the 0-20-cm soil layer was identified in NERICA 1 even under soil conditions without an impediment to deep root development; however, this did not contribute to maintaining dry matter production in upland rice. Thus, we show different root developmental traits associated with drought avoidance in the two NERICA varieties, and that desirable root traits for upland rice cultivation vary depending on the target soil environment, such as the distribution of soil moisture and root penetration resistance.

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Section: Experiments 1 Evaluation Of Plasticity In Deep Root Developmentmentioning

confidence: 99%

Drought-induced root plasticity of two upland NERICA varieties under conditions with contrasting soil depth characteristics

Menge

Kameoka

Kano‐Nakata

et al. 2016

Plant Production Science

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“…Three rice cultivars were used; IRAT 109, Dular and Honenwase. IRAT 109, an upland japonica cultivar, was selected because of its deep-rooting behavior and expected tolerance to drought (Kato et al, 1991 ;Nemoto et al, 1998). Dular, a traditional lowland indica cultivar was chosen for its drought tolerance (De Datta et al, 1975).…”

Section: Exp 1 : Effect Of Drought and Rewateringmentioning

confidence: 99%

Dry Matter Production and Root System Development of Rice Cultivars under Fluctuating Soil Moisture

Bañoc

Yamauchi

Kamoshita

et al. 2000

Plant Production Science

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“…In general, the roots of upland rice cultivars are thicker and penetrate more deeply into the soil than those of lowland cultivars (O'Toole and Bland 1987). Root distribution has also been quantitatively characterized by using several traits, including root length, volume, and density in the soil at different depths, and these characteristics differed among cultivars , Nemoto et al 1998, Hirayama et al 2007, Kato et al 2007). However, variations in root characteristics have not been fully elucidated with reference to their genetic background in cultivated rice, because only a few cultivars or accessions with unidentified genetic background were used in the abovementioned studies.…”

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confidence: 99%

Variation in root morphology and anatomy among accessions of cultivated rice (Oryza sativa L.) with different genetic backgrounds

et al. 2009

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Asian cultivated rice (Oryza sativa L.) has genetic diversification of root characteristics, but this variation has not been elucidated fully with reference to the genetic background. To clarify the differences in root anatomical and morphological traits among different varietal groups of cultivated rice, we analyzed four anatomical traits (root thickness, stele transversal area, total transversal area and number of late metaxylem vessels) and two morphological traits (root length index and ratio of deep rooting) in 59 accessions. A previous principal-coordinate analysis study using data on 179 restriction fragment length polymorphisms classified these accessions into three varietal groups: 13 japonica, 21 indica-I, and 25 indica-II. Based on a principalcomponents analysis of the six traits, the japonica group had wide variation in root anatomy compared to the two indica groups. In particular, japonica upland rice was characterized by a larger stele and xylem structures. By contrast, the two indica groups had wide variation in root morphology compared to the japonica group. Of the two indica groups, on average, the indica-I accessions had deeper, thicker roots than the indica-II accessions. Our results demonstrate that the japonica and indica groups contain different genetic diversity with respect to their root characteristics.

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Deep Rooted Rice Varieties Detected through the Observation of Root Characteristics Using the Trench Method.

Cited by 30 publications

References 2 publications

Drought-induced root plasticity of two upland NERICA varieties under conditions with contrasting soil depth characteristics

Drought-induced root plasticity of two upland NERICA varieties under conditions with contrasting soil depth characteristics

Dry Matter Production and Root System Development of Rice Cultivars under Fluctuating Soil Moisture

Variation in root morphology and anatomy among accessions of cultivated rice (Oryza sativa L.) with different genetic backgrounds

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