Root growth dynamics and stomatal behaviour of rice (Oryza sativa L.) grown under aerobic and flooded conditions

Kato, Yoichiro; Okami, Midori

doi:10.1016/j.fcr.2009.12.003

Cited by 99 publications

(66 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From this, there was moderate use of soil water ( Figure 1B), probably due to the maturation of the plant and the nearest senescence phase. Root weight density peaks at around flowering and its decrease is accentuated after this stage, specially bellow 0.15 m (Kato & Okami, 2010), due to root degeneration. Additionally, likely upward flow of ground water may explain the trend of increased soil moisture from deeper layers.…”

Section: Resultsmentioning

confidence: 99%

“…The highest evapotranspirations observed in R3 in relation to those observed in the R5 stage suggest that plants, even subjected to similar water stress periods in both growth stages, kept better water conditions in R3 than in the R5 stage. This can be explained by the reduction in effectiveness of the root system during the grain filling stage, which occurs from the R5 stage on (Kato & Okami, 2010), when the competition between plant organs for carbohydrates favors the grains over the other storage sites, such as the root system. In addition, the remobilization of carbohydrates in the plant to the grains, although little intense in rice, compromises the root system.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Evapotranspiration and grain yield of upland rice as affected by water deficit

Guimarães

Stone

Silva

2016

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

A B S T R A C TTo achieve an accurate phenotyping for drought tolerance, it is important to control water stress levels and timing. This study aimed to determine water use by upland rice plants during periods of irrigation withholding and its relationship with grain yield in order to increase the efficiency of this phenotyping. Two experiments were carried out in a randomized block design in which six water treatments (irrigation withholding for periods of 2, 4, 6, 8, 10 and 12 days) were compared, with four replicates. In the first experiment, treatments were applied at the R3 stage (panicle exsertion) and, in the second, at the R5 stage (beginning of grain filling). The amount of water evapotranspired was determined by the difference between the soil water storage at the beginning and at the end of irrigation withholding periods, from the surface to 80-cm depth. Evapotranspiration of upland rice from R3 stage was higher compared to that observed from R5 stage, when subjected to similar irrigation withholding periods in both growth stages. Rice grain yield is more sensitive to irrigation withholding imposed from R5 stage than from R3 stage.Evapotranspiração e produtividade do arroz de terras altas afetadas pela deficiência hídrica R E S U M O Para se obter fenotipagem acurada para tolerância à deficiência hídrica, é importante controlar o nível de estresse hídrico e a época de sua aplicação. Este trabalho objetivou determinar o uso de água pelas plantas de arroz de terras altas durante períodos de supressão da irrigação e sua relação com a produtividade de grãos, para aumentar a eficácia desta fenotipagem. Foram conduzidos dois experimentos no delineamento de blocos ao acaso e comparados seis tratamentos hídricos (supressão da irrigação por períodos de 2, 4, 6, 8, 10 e 12 dias) com quatro repetições. No primeiro experimento os tratamentos foram aplicados no estádio R3 (emissão das panículas) e no segundo, no estádio R5 (início do enchimento de grãos). A água evapotranspirada foi determinada pela diferença entre o armazenamento de água no solo no início e no fim dos períodos de supressão da irrigação, da superfície até 80 cm de profundidade. A evapotranspiração do arroz no estádio R3 foi mais alta comparada com a observada no estádio R5, quando submetida a período similar de supressão da irrigação em ambos os estádios. A produtividade do arroz foi mais sensível à supressão da irrigação imposta a partir do estádio R5 do que do estádio R3.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Evapotranspiration and grain yield of upland rice as affected by water deficit

Guimarães

Stone

Silva

2016

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

show abstract

“…It is widely known that rice is an aquatic plant and therefore naturally adapted to high soil moisture environments (Kato & Okami, 2010). For Milyang 23, a typical irrigated analysis revealed a significant relationship between soil moisture content and total root length in all varieties.…”

Section: Shoot and Root Responses To Different Intensities Of Droughtmentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…The water deficit-tolerant genotypes are able to maintain better internal water status, either by taking up more water through a better root system, or by reducing the rate of plant-water use (Kamoshita et al, 2008). A vigorous root growth positively affects water uptake and, hence, maintains rice transpiration (Kato & Okami, 2010) and keeps a lower rice leaf-temperature, ultimately stabilizing yield under water stress. Hirayama et al (2006) also observed that the cultivars of upland rice with deeper root systems had lower leaf temperatures.…”

Section: Genotypesmentioning

confidence: 99%

Physiological parameters to select upland rice genotypes for tolerance to water deficit

Guimarães

Stone

Castro

et al. 2015

Pesq. agropec. bras.

View full text Add to dashboard Cite

-The objective of this work was to evaluate the feasibility of using physiological parameters for water deficit tolerance, as an auxiliary method for selection of upland rice genotypes. Two experiments -with or without water deficit -were carried out in Porangatu, in the state of Goiás, Brazil; the water deficit experiment received about half of irrigation that was applied to the well-watered experiment. Four genotypes with different tolerance levels to water stress were evaluated. The UPLRI 7, B6144F-MR-6-0-0, and IR80312-6-B-3-2-B genotypes, under water stress conditions, during the day, showed lower stomatal diffusive resistance, higher leaf water potential, and lower leaf temperature than the control. These genotypes showed the highest grain yields under water stress conditions, which were 534, 601, and 636 kg ha -1 , respectively, and did not differ significantly among them. They also showed lower drought susceptibility index than the other genotypes. 'BRS Soberana' (susceptible control) was totally unproductive under drought conditions. Leaf temperature is a easy-read parameter correlated to plant-water status, viable for selecting rice genotypes for water deficit tolerance.Index terms: Oryza sativa, leaf diffusive resistance, leaf temperature, leaf-water potential. Parâmetros fisiológicos para selecionar genótipos de arroz quanto à tolerância ao deficit hídricoResumo -O objetivo deste trabalho foi avaliar a possibilidade de uso de parâmetros fisiológicos de tolerância à deficiência hídrica como método auxiliar na seleção de genótipos de arroz de terras altas. Dois experimentosum com e outro sem deficit hídrico -foram realizados em Porangatu, GO; o com deficit hídrico recebeu cerca da metade da irrigação que foi aplicada ao tratamento bem irrigado. Avaliaram-se quatro genótipos com diferentes níveis de tolerância ao estresse hídrico. Os genótipos UPLRI 7, B6144F-MR-6-0-0 e IR80312-6-B-3-2-B, em condições de estresse hídrico ao longo do dia, apresentaram menor resistência difusiva estomática, maior potencial de água nas folhas e menor temperatura das folhas do que a testemunha. Esses genótipos apresentaram as maiores produtividades em condições de deficiência hídrica, que foram respectivamente 534, 601 e 636 kg ha -1 , e não diferiram significativamente entre si. Eles também apresentaram menores índices de susceptibilidade à seca do que os outros genótipos. 'BRS Soberana' (testemunha suscetível) foi totalmente improdutiva em condições de deficiência hídrica. A temperatura das folhas é um parâmetro de fácil leitura correlacionado à condição hídrica da planta, viável para selecionar genótipos de arroz quanto à tolerância ao deficit hídrico.Termos para indexação: Oryza sativa, resistência difusiva foliar, temperatura foliar, potencial de água na folha.

show abstract

Root growth dynamics and stomatal behaviour of rice (Oryza sativa L.) grown under aerobic and flooded conditions

Cited by 99 publications

References 39 publications

Evapotranspiration and grain yield of upland rice as affected by water deficit

Evapotranspiration and grain yield of upland rice as affected by water deficit

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

Physiological parameters to select upland rice genotypes for tolerance to water deficit

Contact Info

Product

Resources

About