Root Growth and Distribution in Some Japonica-Indica Hybrid and Japonica Type Rice Cultivars under Field Conditions.

Kang, Sungmin; Morita, Shigenori; Yamazaki, Koou

doi:10.1626/jcs.63.118

Cited by 45 publications

(19 citation statements)

References 21 publications

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“…Ling (2000) proposed that a high-yielding rice cultivar should have a great and vigorous root system. It was also reported that the large aboveground biomass of japonica/indica hybrids was mainly attributed to their large root system (Harada et al, 1994;Kang et al, 1994;Liu et al, 2003). Although the differences in root traits (Dong et al, 2002;Wu et al, 2001;Zhu et al, 2000), grain yield, grain quality and plant types between hybrid and inbred rice of mid-season indica cultivars have been studied Zhang et al, 2009), there were few studies on the changes in morphological and physiological traits of roots of mid-season rice cultivars and their relationships with grain yield during the GI.…”

Section: Introductionmentioning

confidence: 95%

“…Mid-season rice is the dominant one among all the rice planting systems (China National Rice Research Institute, 1988;Zheng et al, 2003). There have been many reports on root traits for high-yielding rice cultivars (Harada et al, 1994;Kang et al, 1994;Ling, 2000;Liu et al, 2003). Ling (2000) proposed that a high-yielding rice cultivar should have a great and vigorous root system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Changes in Grain Yield and Root Morphology and Physiology of Mid-Season Rice in the Yangtze River Basin of China During the Last 60 Years

Liu¹,

Zhang²,

Ju³

et al. 2014

JAS

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The genetic improvement (GI) plays an important role in yield increase in rice in the Yangtze River Basin of China, and rice roots might have a crucial function during the GI. However, little is known what changes in root physiology and morphology were during the GI in this area and how they were related with grain yield. In this study, 24 typical mid-season rice cultivars (including hybrid combinations) applied in the area during the last 60 years were grown in the field, and they were classified into six types according to their application decades in which the cultivars were predominantly used. Changes in morphological and physiological traits of roots and their relationships with grain yield during the GI were investigated. Results showed that grain yield was significantly increased. Increase in grain yield was attributed mainly to the increase in total number of spikelets, which resulted mainly from a large panicle. The root dry weight, root length, root diameter, root oxidation activity, total absorbing surface area and active absorbing surface area of roots were also increased with the GI. Regression analysis showed that the root dry weight, root length, root diameter, root oxidation activity, total absorbing surface area and active absorbing surface area of roots were very significantly and positively correlated with grain yield. The results suggest that the GI improves root morph-physiological traits which benefits shoot growth, leading to a higher grain yield for the modern cultivars, especially for super rice cultivars.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Changes in Grain Yield and Root Morphology and Physiology of Mid-Season Rice in the Yangtze River Basin of China During the Last 60 Years

Liu¹,

Zhang²,

Ju³

et al. 2014

JAS

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“…The shoot samples were cut and ovendried at 70°C for 72 hours and the dry weights were measured. The root system was extracted using a 15-cm diameter and 25-cm depth monolith stainless cylinder (Kang et al 1994). The collected roots were washed free of soil in running water.…”

Section: Measurementsmentioning

confidence: 99%

Quantitative evaluation of plastic root responses to contiguous water gradient in rice

et al. 2017

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Root plasticity is the key trait for plant adaptation to environmental stresses. To quantify phenotypic plasticity to its full extent in potential, it needs to be evaluated under contiguous environmental changes. For that purpose, we used the combination of chromosome segment substitution lines (Nipponbare/Kasalath CSSLs) and line source sprinkler (LSS) system of irrigation. For analysis, we first attempted to apply the coefficient of variation (CV) and norm of reaction that have been used as the conventional approaches, and then propose a new approach for quantification of root plasticity. Results revealed that CV was not linked to root plasticity under contiguous water gradient in this study. In contrast, norm of reaction was linked to root plasticity and better explained with curve than linear, especially for CSSL50 (the most plastic genotypes) under such gradient. Based on the norm of reaction with curve, root plasticity was calculated using the difference in total root length between CSSLs and the recurrent parent, Nipponbare. Further analysis of root plasticity in relation to dry matter production was also done. By applying the new approach, we confirmed that root plasticity expression was affected by the intensities of drought stress and genotypes, indicating that such root plasticity is genetically controlled. In addition, root plasticity effectively contributed to the dry matter production under the drought conditions and maximized at around 20% of soil moisture content (-0.04 MPa). By using CSSLs and LSS system, we successfully evaluated root plasticity under contiguous water gradient.

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“…Thus, the total soil drying duration was 109 d in 2010 and 88 d in 2011. In 2011, roots for each plant along the soil moisture gradient and increasing soil depths were sampled at 20-cm depth increments from the soil surface using a stainless steel cylinder measuring 15 cm in diameter (Kang et al, 1994). Deep roots were defined as roots that developed below 20-cm soil depth in this study.…”

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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Root Growth and Distribution in Some Japonica-Indica Hybrid and Japonica Type Rice Cultivars under Field Conditions.

Cited by 45 publications

References 21 publications

Changes in Grain Yield and Root Morphology and Physiology of Mid-Season Rice in the Yangtze River Basin of China During the Last 60 Years

Changes in Grain Yield and Root Morphology and Physiology of Mid-Season Rice in the Yangtze River Basin of China During the Last 60 Years

Quantitative evaluation of plastic root responses to contiguous water gradient in rice

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

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