Genotypic variation for root traits of maize (Zea mays L.) from the Purhepecha Plateau under contrasting phosphorus availability

Bayuelo-Jiménez, Jeannette S.; Gallardo-Valdez, M; Pérez-Decelis, Verónica A.; Magdaleno-Armas, Lourdes; Ochoa, Iván; Lynch, Jonathan P.

doi:10.1016/j.fcr.2011.01.001

Cited by 105 publications

(73 citation statements)

References 44 publications

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“…Maize has substantial genetic variation for root architectural and anatomical phenes (Hochholdinger, 2009;Bayuelo-Jiménez et al, 2011;Trachsel et al, 2011;Burton et al, 2013Burton et al, , 2014Lynch, 2013). The genotypic variability observed here was consistent with previous studies, which found that CCFN varies in the range from seven to 16 for CCFN in Zea spp.…”

Section: Discussionsupporting

confidence: 81%

Reduced Root Cortical Cell File Number Improves Drought Tolerance in Maize

2014

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ORCID ID: 0000-0002-7265-9790 (J.P.L.).We tested the hypothesis that reduced root cortical cell file number (CCFN) would improve drought tolerance in maize (Zea mays) by reducing the metabolic costs of soil exploration. Maize genotypes with contrasting CCFN were grown under wellwatered and water-stressed conditions in greenhouse mesocosms and in the field in the United States and Malawi. CCFN ranged from six to 19 among maize genotypes. In mesocosms, reduced CCFN was correlated with 57% reduction of root respiration per unit of root length. Under water stress in the mesocosms, genotypes with reduced CCFN had between 15% and 60% deeper rooting, 78% greater stomatal conductance, 36% greater leaf CO 2 assimilation, and between 52% to 139% greater shoot biomass than genotypes with many cell files. Under water stress in the field, genotypes with reduced CCFN had between 33% and 40% deeper rooting, 28% lighter stem water oxygen isotope enrichment (d 18 O) signature signifying deeper water capture, between 10% and 35% greater leaf relative water content, between 35% and 70% greater shoot biomass at flowering, and between 33% and 114% greater yield than genotypes with many cell files. These results support the hypothesis that reduced CCFN improves drought tolerance by reducing the metabolic costs of soil exploration, enabling deeper soil exploration, greater water acquisition, and improved growth and yield under water stress. The large genetic variation for CCFN in maize germplasm suggests that CCFN merits attention as a breeding target to improve the drought tolerance of maize and possibly other cereal crops.

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Section: Discussionsupporting

confidence: 81%

Reduced Root Cortical Cell File Number Improves Drought Tolerance in Maize

2014

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“…The positive correlation between biomass (TDW and SDW) and root measurements (DG, RSA, RL1, RSA1) is consistent with results from other studies, and indicates that if selection is performed according to such correlations, then genotypes with the highest values for these factors can be selected and high tolerance to P deficiency can be obtained (Bayuelo-Jiménez et al, 2011;Zhang et al, 2014).…”

Section: Discussionsupporting

confidence: 75%

“…Differences between genotypes that efficiently use P can be observed in the early plant stages, and these plants exhibit shoot reduction, and changes in root growth and architecture in LP environments (Bayuelo-Jiménez et al, 2011;de Sousa et al, 2012). Thus, early selection for P efficiency is essential to accelerate breeding programs once it allows quick selection in a controlled environment, especially when field experiments are more expensive and cannot always be performed due to climatic conditions (Mundim et al, 2013;Zhang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Screening of inbred popcorn lines for tolerance to low phosphorus

et al. 2016

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ABSTRACT. Increasing phosphorus use efficiency in agriculture is essential for sustainable food production. Thus, the aims of this study were: i) to identify phosphorus use efficiency (PUE) in popcorn lines during the early plant stages, ii) to study the relationship between traits correlated with PUE, and iii) to analyze genetic diversity among lines. To accomplish this, 35 popcorn lines from Universidade Estadual de Maringá breeding program were studied. The experiment was conducted in a growth chamber using a nutrient solution containing two concentrations of phosphorus (P): 2.5 µM or low P (LP) and 250 µM or high P (HP). After 13 days in the nutrient solution, root morphology traits, shoot and root dry weight, and P content of the maize seedlings were measured. A deviance analysis showed there was a high level of genetic variability. An unweighted pair group method with arithmetic mean (UPGMA) clustering analysis identified three groups for the LP treatment (efficient, intermediate, and inefficient) and three groups for the HP treatment (responsive, moderately responsive, and unresponsive). The results of a principal component analysis and selection index were consistent with the UPGMA analysis, and lines 1, 2, 13, 17, 26, and 31 were classified as PUE.

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“…A focus on root traits has been a feature of research that is associated with the breeding of wheat (Wasson et al, 2012), barley (Brown et al, 2013a;Haling et al, 2013), and maize (Bayuelo-Jiménez et al, 2011). Simultaneously, attempts have been made to uncover the molecular basis of RH development in the grasses at both the transcriptomic (Kwasniewski et al, 2010) and proteomic (Nestler et al, 2011;Janiak et al, 2012) levels.…”

Section: What Do We Know?mentioning

confidence: 99%

Root Hair Development in the Grasses: What We Already Know and What We Still Need to Know

2015

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ORCID IDs: 0000-0002-5261-6662 (M.Ma.); 0000-0001-7390-7234 (I.S.).A priority in many crop improvement programs for a long time has been to enhance the tolerance level of plants to both abiotic and biotic stress. Recognition that the root system is the prime determinant of a plant's ability to extract both water and minerals from the soil implies that its architecture is an important variable underlying a cultivar's adaptation. The density and/or length of the root hairs (RHs) that are formed are thought to have a major bearing on the plant's performance under stressful conditions. Any attempt to improve a crop's root system will require a detailed understanding of the processes of RH differentiation. Recent progress in uncovering the molecular basis of root epidermis specialization has been recorded in the grasses. This review seeks to present the current view of RH differentiation in grass species. It combines what has been learned from molecular-based analyses, histological studies, and observation of the phenotypes of both laboratory-and field-grown plants.

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Genotypic variation for root traits of maize (Zea mays L.) from the Purhepecha Plateau under contrasting phosphorus availability

Cited by 105 publications

References 44 publications

Reduced Root Cortical Cell File Number Improves Drought Tolerance in Maize

Reduced Root Cortical Cell File Number Improves Drought Tolerance in Maize

Screening of inbred popcorn lines for tolerance to low phosphorus

Root Hair Development in the Grasses: What We Already Know and What We Still Need to Know

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