Identification of drought-tolerant corn genotypes by multivariate analysis1

Sousa, Ricardo Silva de; Bastos, E. A.; Cardoso, M. J.; Pereira, Diléia Rocha

doi:10.1590/1983-40632018v4852122

Cited by 5 publications

(4 citation statements)

References 12 publications

(16 reference statements)

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“…The first component was strongly influenced by ear length and number of kernels per ear, while the second component was also influenced by above-ground dry matter, shoot dry matter, and plant height. Some of these traits have already been used successfully in the field, to discriminate corn genotypes in breeding programs aiming at tolerance to drought (Sousa et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Discrimination of responses of corn genotypes to drought through physiological, growth, and yield traits

Santos

Casari

Molinari

et al. 2021

Pesq. agropec. bras.

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The objective of this work was to evaluate different traits of four corn (Zea mays) genotypes with contrasting responses to drought and to determine the main traits associated to such responses. The experiment was carried out in a greenhouse. The plants were grown in pots subjected to full irrigation. Drought was imposed to plants at 54 days after sowing and kept constant for 12 consecutive days; however, a group of plants remained under full irrigation. Traits related to leaf gas exchange, photochemical apparatus, growth, and yield were assessed, and data were subjected to hierarchical agglomerative clustering and principal component analysis. DKB 390 distinguishes from the other genotypes for growth and yield traits, while 2B-707 and DKB 390 discriminate from 'BRS 1030' and 'BRS 1010' for physiological traits. Ear length, kernel number per ear, above-ground dry matter, shoot dry matter, and plant height are the most important growth and yield traits to discriminate genotype-dependent drought tolerance. Among the physiological traits, the most important are: chlorophyll content, absorptivity, leaf temperature, maximum fluorescence in the dark-adapted state, minimum fluorescence in the dark-adapted state, water-use efficiency, and intercellular CO2 concentration.

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Section: Resultsmentioning

confidence: 99%

Discrimination of responses of corn genotypes to drought through physiological, growth, and yield traits

Santos

Casari

Molinari

et al. 2021

Pesq. agropec. bras.

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“…These results indicated that flooding is restrictive to corn plant growth. According to Souza et al (2018), excessive water application can generate hypoxia in the plants, restricting plant matter accumulation.…”

Section: Discussionmentioning

confidence: 99%

Establishment of corn plants under different water regiments

Dos Santos,

Gratão,

Basílio

et al. 2023

Rev. Car. Cien. Soc.

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The objective of the present study was to identify the effect of water availability on corn plant growth. The study was carried out in greenhouse covered with transparent plastic with Sombrite material sides that intercepted this 50% solar radiation located at the State University of Goiás, Brazil, South-East Campus Ipameri. Four corn seeds were planted in each polyethylene pot containing 8 kg substrate consisting of soil, sand and manure at the proportion of 3:1:1, respectively. A completely randomized design was used with six treatments and six replications. After emergence and initial development, the plants were irrigated with volumes of water corresponding to 0%, 25%, 50%, 100%, 200% and 400% of the daily evapotranspiration at 23 days after emergence. At 31 days after emergence the following variables were analyzed: number of leaves, plant height, stem diameter, total biomass, root mass ratio, stem mass ratio, Leaf mass ratio, photosynthetic pigments, relative water content, transpiration rate and chlorophyll a fluorescence. Water shortage and flooding inhibited growth in the corn plants and thus damaged the crop establishment, but at different intensities, because water shortage was much more restrictive to plant development than flooding. Furthermore, it is emphasized that the corn plants are isoydric because they anticipate water shortage through efficient stomata sensitivity that controls water loss by transpiration.

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“…The results indicated that P. edulis plants are moderately sensitive to water excess in the soil. According to Souza, Bastos, Cardoso and Pereira (2018), excess water supply can lead to hypoxia in plants that restricts biomass accumulation. Under excess water in the soil there are fewer spaces designated to gases and, if it persists, inhibition of respiration, cytosol pH reduction and decreased aquaporin activity is common, according to Taiz and Zeiger (2017).…”

Section: Discussionmentioning

confidence: 99%

Passiflora edulis Growth Under Different Water Regimes

Faria¹,

Souza²,

Alvarenga³

et al. 2020

JAS

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The present study aimed to evaluate the initial growth of Passiflora edulis plants under water deficit and inundation. The work was carried out in a greenhouse covered with transparent plastic in pots with a capacity of five liters and filled with 5 kg of substrate composed of oxisol, sand and cattle manure in the proportion of 3:1:1, respectively. The experimental design used was completely randomized, with seven treatments and five repetitions; 30 days after emergence, the plants were irrigated with water equivalent to 25%, 50%, 75%, 100%, 125%, 150% and 175% of the pot capacity and the analyzes were performed on the 52nd day. The P. edulis plants under limitation and excess water showed high stomatal sensitivity to reduce the water. In addition, under water deficit, the plants showed bigger root growth to maximize water absorption from the soil, but in both stresses the plants demonstrated reduced vegetative growth, that implies retarded establishment, thus, demonstrating an average susceptibility to water deficit and inundation.

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Identification of drought-tolerant corn genotypes by multivariate analysis1

Cited by 5 publications

References 12 publications

Discrimination of responses of corn genotypes to drought through physiological, growth, and yield traits

Discrimination of responses of corn genotypes to drought through physiological, growth, and yield traits

Establishment of corn plants under different water regiments

Passiflora edulis Growth Under Different Water Regimes

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