Early characterization of maize plants in selection cycles under soil flooding*

Souza, Thiago Corrêa de; Castro, Evaristo Mauro de; Magalhães, P. C.; Alves, E. Trindade; Pereira, Fabricio José

doi:10.1111/j.1439-0523.2012.01973.x

Cited by 19 publications

(8 citation statements)

References 47 publications

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“…Previous studies showed that root traits such as length and dry weight were inhibited in waterlogged soil (Sallam & Scott, 1987;Shimamura et al, 2003;Henshaw et al, 2007a;Yamane & Iijima, 2016). Root length in maize also reflected its waterlogging tolerance under field conditions (Souza et al, 2012). Although waterlogging treatment in experiment 2 inhibited root development more strongly than hypoxia treatment in experiment 1, IRL and relative Table 3.…”

Section: Correlation Between the Results In Experiments 1 (Hydroponicsmentioning

confidence: 98%

Phenotypic variation in root development of 162 soybean accessions under hypoxia condition at the seedling stage

Suematsu

Abiko

Nguyen

et al. 2017

Plant Production Science

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Soybean is often damaged by hypoxia caused by waterlogging at the seedling stage. Hypoxia severely inhibits root development and retards plant growth. We aimed to clarify phenotypic variation in root development under hypoxia condition at the seedling stage using diverse soybean accessions. Root development in 162 accessions was evaluated in hydroponic culture. Substantial changes under hypoxia were investigated by means of WinRHIZO analysis before and after the treatment. We found significant phenotypic variation in hypoxia tolerance in root among the 162 accessions. A principal components analysis indicated an association between hypoxia tolerance and the country of origin. We found three new accessions which have a high ability to develop roots under hypoxia (Kokubu 7, Maetsue zairai 90B, and Yahagi). Root development in selected accessions was also evaluated in soil culture. Root development levels in hydroponic and soil culture were significantly correlated. These results will provide important information on waterlogging damage in regions where waterlogging occurs. The three accessions with hypoxia-tolerant roots might be useful for genetic improvement of waterlogging tolerance of modern soybean varieties.

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Section: Correlation Between the Results In Experiments 1 (Hydroponicsmentioning

confidence: 98%

Phenotypic variation in root development of 162 soybean accessions under hypoxia condition at the seedling stage

Suematsu

Abiko

Nguyen

et al. 2017

Plant Production Science

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“…For the morphology analysis of the root system, the image analysis system WinRHIZO Pro 2007a (Regent Instruments, Sainte-Foy, QC, Canada) was used, coupled to a professional scanner (Epson, Expression 10000 XL, Epson America, Inc., Long Beach, CA, USA), equipped with an additional photon unit (TPU). The procedures for obtaining the images were made according to Souza et al (2012a). The following characteristics were determined: root length (RL) (cm), root surface area (SA) (cm 2 ), root mean diameter (RMD) (mm), and root volume (RV) (cm 3 ).…”

Section: Root Morphologymentioning

confidence: 99%

“…Each sample consisted of a leaflet. The samples were fixed in solution of formaldehyde, acetic acid, and 90% ethanol (FAA 90); paradermal sections were cut according to Souza et al (2012a), and cross sections of mesophyll and midrib were cut according to Souza et al (2010).…”

Section: Leaf and Root Anatomymentioning

confidence: 99%

Copper Toxicity on Photosynthetic Responses and Root Morphology of Hymenaea courbaril L. (Caesalpinioideae)

Marques

Júnior

Silva

et al. 2018

Water Air Soil Pollut

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Copper (Cu) is a micronutrient essential for plant development. However, in excess, it is toxic to plants and may cause various physiological and morphological changes. The study of the growth of plants exposed to excess Cu is important for the development of phytoremediation programs and for understanding the mechanisms involved in the tolerance of this metal. In this context, the objective of this research was to evaluate the effect of excess copper on photosynthetic responses and root morphology of Hymenaea courbaril L. Biometric measurements, gas exchange, root morphology, and Cu content in tissues and indices (TI and TF) were assessed, involving metal content and biomass. Up to a concentration of 200 mg kg −1 , Cu favored growth, gas exchange, and root morphology of the plants under study. At a higher concentration (800 mg kg −1) in the soil, it affected plant growth and caused a decrease in photosynthetic rate. Biochemical limitations in photosynthesis were observed, as well as lower maximum net photosynthetic rate (A max), respiration rate in the dark (R d), light compensation point (LCP), light saturation point (LSP), and apparent quantum yield (α), when exposed to excess Cu. Root length, surface area, mean diameter, root volume, dry biomass, and specific root length decreased with high Cu concentrations in the soil. Cu was accumulated in the roots as a mechanism of tolerance to the excess of this metal in order to preserve the most metabolically active tissues present in the leaves. At a concentration of 800 mg kg −1 , copper also caused inhibition of the root system. Plants of H. courbaril showed tolerance to excess Cu in the soil and can be indicated for the recovery of areas contaminated with this metal.

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“…To analyze the morphology of the root system, the WinRhizo Pro 2007a image analysis system (Regent Instruments Inc., Sainte-Foy, Quebec, Canada) was used, coupled to a professional scanner Epson Expression 10000 XL (Epson America, Inc., Long Beach, CA, USA) equipped with an additional light unit (TPU). The images were obtained according to Souza et al (2012). The evaluated traits were: root length (cm), which was also analyzed by diameter classes (0 to 4.5 mm) using the same software; root surface area (cm 2 ); and root volume (cm 3 ).…”

Section: Methodsmentioning

confidence: 99%

Corn root morphoanatomy at different development stages and yield under water stress

Souza

Magalhães

Castro

et al. 2016

Pesq. agropec. bras.

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-The objective of this work was to characterize the morphoanatomy of roots and the yield traits of two corn hybrids contrasting for drought tolerance (DKB 390, tolerant; and BRS 1030, sensitive), at different stages of development. Water deficit was imposed for ten days, in a greenhouse, at three growth stages: V5, VT, and R3. These treatments were combined to generate cumulative stress during the plant cycle, as: V5VT, V5R3, VTR3, and V5VTR3. The following were analyzed: root anatomy; proportion of aerenchyma in the cortex; metaxylem number and diameter; phloem thickness; as well as morphological characteristics, such as root length, volume, and surface area, specific root length, length of fine roots, grain yield, and ear length and diameter. Development stage affected the responses to stress: DKB 390 showed the best performance for root morphoanatomy and yield traits, under drought stress, at the reproductive stages, mainly R3, and in the treatments with cumulative stress, especially V5VTR3; whereas BRS 1030 presented higher means for the studied parameters, mainly at the V5 and VT stages, but did not show a higher grain yield under water stress. The greater tolerance of the DKB 390 hybrid to water deficit is probably linked with a memory of pre-exposure to water stress at different growth stages.Index terms: Zea mays, aerenchyma, drought, endoderm, specific root length, WinRhizo. Morfoanatomia radicular em diferentes estádios de desenvolvimento e produtividade do milho sob estresse hídricoResumo -O objetivo deste trabalho foi caracterizar a morfoanatomia radicular e os atributos de rendimento de dois híbridos de milho contrastantes quanto à seca (DKB 390, tolerante; e BRS 1030, sensível), em diferentes estádios de desenvolvimento. A deficiência hídrica foi imposta por dez dias, em casa de vegetação, em três estádios de desenvolvimento: V5, VT e R3. Esses tratamentos foram combinados para gerar estresses acumulativos durante o ciclo da planta, como: V5VT, V5R3, VTR3 e V5VTR3. Foram analisados: anatomia radicular; proporção de aerênquima no cortex; número e diâmetro de metaxilema; espessura do floema; bem como características morfológicas, como comprimento, volume e área de superfície radicular, comprimento específico das raízes, comprimento de raízes finas, rendimento de grãos, e comprimento e diâmetro da espiga. O estádio de desenvolvimento influenciou as respostas ao estresse: DKB 390 apresentou o melhor desempenho quanto à morfoanatomia radicular e aos atributos de rendimento, quando submetido a estresse hídrico, nos estádios reprodutivos, sobretudo em R3, e nos tratamentos acumulativos de estresse, principalmente no V5VTR3; enquanto BRS 1030 apresentou as maiores médias para os parâmetros estudados, principalmente nos estádios V5 e VT, mas não apresentou maior rendimento de grãos sob estresse hídrico. A maior tolerância do híbrido DKB 390 ao estresse hídrico provavelmente relaciona-se à memória de exposição prévia ao estresse hídrico em diferentes estádios de desenvolvimento.Termos para indexação...

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Early characterization of maize plants in selection cycles under soil flooding*

Cited by 19 publications

References 47 publications

Phenotypic variation in root development of 162 soybean accessions under hypoxia condition at the seedling stage

Phenotypic variation in root development of 162 soybean accessions under hypoxia condition at the seedling stage

Copper Toxicity on Photosynthetic Responses and Root Morphology of Hymenaea courbaril L. (Caesalpinioideae)

Corn root morphoanatomy at different development stages and yield under water stress

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