Root Morphology of Maize Lines with Contrasting Drought Resistance Under Three Toxic Levels of Aluminum

Magalhães, P. C.; Souza, Thiago Corrêa de; Cantão, F. R. de O.; Padilha, F. A.

doi:10.18512/1980-6477/rbms.v11n1p35-48

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cu favored root length development, surface area, and volume of fine roots, which are the roots suitable for water absorption, up to a concentration of 400 mg kg −1 . However, even at 400 mg kg −1 , it was observed that the favoring of roots classified as thick (Ø > 2.0 mm) (Magalhães et al 2012) also occurred as a sign of support, not absorption roots. Thus, up to 200 mg kg −1 , concentration seems to have actually favored the root system of H. courbaril in soil exploration.…”

Section: Root System Morphology and Dry Matter Attributesmentioning

confidence: 91%

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

Marques

Júnior

Silva

et al. 2018

Water Air Soil Pollut

View full text Add to dashboard Cite

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.

show abstract

Section: Root System Morphology and Dry Matter Attributesmentioning

confidence: 91%

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

Marques

Júnior

Silva

et al. 2018

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…Root length and surface area are considered key parameters for nutrient and water uptake; thus, it is possible that under field conditions the DT corn genotype can show a different response to nutrients and water stress conditions, particularly during crucial growth stages for yield determination (Himmelbauer et al, 2004). Previous studies evaluated drought-tolerant corn genotypes for root morphology, and results showed greater values for both total root length and shoot dry mass ratio when compared with conventional genotypes (Magalhães et al, 2012).…”

Section: Cornmentioning

confidence: 99%

Genotypic Variation on Root Growth and Nutrient Uptake in Corn and Soybean

Rosa

Diaz

Hansel

et al. 2019

Agrosystems Geosci & Env

View full text Add to dashboard Cite

show abstract

“…Many root traits and their responses to aluminum toxicity have been used in breeding and selection of tolerant genotypes in cereals [53,54]. Principal component analysis can be used to identify the most influential traits, so first two PCs were used to identify influential traits.…”

Section: Principal Component Analysis and Cluster Analysismentioning

confidence: 99%

“…This indicates that the comprehensive maize hybrid breeding program that was used in the early years [52] had resulted in co-selection for aluminum tolerance, especially when the breeding focused on developing drought-tolerant genotypes in the late 1980s [53]. Studies have shown that breeding for drought tolerant results in aluminum tolerance [54]. Therefore, co-selection for aluminum tolerance could have occurred, just as Masole and Gumbo (1980) reported good genetic gain for drought tolerance and earliness during breeding.…”

Section: Implications On Plant Breeding In Zambiamentioning

confidence: 99%

Genotypic Variation in Seedling Tolerance to Aluminum Toxicity in Historical Maize Inbred Lines of Zambia

et al. 2015

View full text Add to dashboard Cite

Maize (Zea mays L) is the most important food grain in sub-Saharan Africa and is mostly grown by small-scale farmers under rainfed conditions. Aluminum toxicity caused by low pH is one of the abiotic factors limiting maize production among smallholder farmers. Therefore, breeding maize hybrids that are tolerant to aluminum toxicity will sustain and increase maize production in these areas. Hence this study was undertaken to assess the genotypic variation for aluminum toxicity in maize inbred lines. Fourteen maize inbred lines of historical importance that are used in maize hybrid breeding in Zambia were studied for seedling root variation under different aluminum concentrations using hydroponic conditions. The aluminum tolerance membership index based on three traits (actual root length, relative root length and root length response) classified genotypes L3233 and L1214 as highly tolerant, L5527 and ZM421 as tolerant, and L12, L3234, and ZM521 as intermediate. The high PCV, GCV, and heritability observed for the root traits indicate that opportunities for selection and breeding for aluminum tolerance among Zambian inbred lines exist. Furthermore, the study indicated that a higher genetic gain would be expected from net root growth followed by shoot length response as selection traits, thus supporting the use of root traits for aluminum tolerance screening. OPEN ACCESSAgronomy 2015, 5 201

show abstract

Root Morphology of Maize Lines with Contrasting Drought Resistance Under Three Toxic Levels of Aluminum

Cited by 3 publications

References 0 publications

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

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

Genotypic Variation on Root Growth and Nutrient Uptake in Corn and Soybean

Genotypic Variation in Seedling Tolerance to Aluminum Toxicity in Historical Maize Inbred Lines of Zambia

Contact Info

Product

Resources

About