Physiological Responses of Cowpea Under Water Stress and Rewatering in No-Tillage and Conventional Tillage Systems

Freitas, Rômulo Magno Oliveira de; Dombroski, Jéferson Luiz Dallabona; Freitas, Francisco Cláudio Lopes de; Nogueira, Narjara Walessa; Pinto, José Rivanildo de Souza

doi:10.1590/1983-21252017v30n303rc

Cited by 27 publications

(29 citation statements)

References 25 publications

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“…Some authors observed, however, that cowpea can preserve leaf water potential (Freitas et al, 2017) and relative water content (Anyia & Herzog, 2004) even under cumulative water deficit conditions, a characteristic also observed by Guimarães et al (2006) for common beans, suggesting that the crop acts as a conservative species by prioritizing the maintenance of its water status rather than its photosynthetic activity, corroborating the reduction found in its WUE in the presence of water deficit.…”

Section: Resultsmentioning

confidence: 75%

Yield and water use efficiency of cowpea under water deficit

Souza

Ramos

Fiel

et al. 2019

Rev. bras. eng. agríc. ambient.

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The state of Pará is the main regional producer of cowpea, but its yield is still low compared to other states of the Northern region such as Amazonas and Tocantins, due to the management adopted and the water regime during the cycle, since its cultivation is conducted on a rainfed basis. The objective of this study was to evaluate how water deficit imposed during reproductive stage interferes in the yield of cowpea and in its water use efficiency under the climatic conditions of Castanhal, Pará, Brazil, for agricultural planning purposes. The experiment was carried out in Castanhal, northeastern region of the Pará state during the dry season of 2014, 2015 and 2016. The experimental design was randomized blocks with six blocks and four treatments, corresponding to different irrigation depths in the reproductive stage, defined as 100, 50, 25 and 0% of the crop evapotranspiration. Water use efficiency (WUE) was determined by the ratio between total grain yield and total water used in each treatment. Maximum water availability led to an average increase in yield of 58% compared to the treatment without irrigation. Water depths below 260 mm limited yield to values lower than 1,000 kg ha-1. The cultivar adopted had WUE of 4.63 kg ha-1 mm-1, in response to the higher levels of water supply, but showed WUE of 4.31 kg ha-1 mm-1 under water depth of 50% of water demand.

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Section: Resultsmentioning

confidence: 75%

Yield and water use efficiency of cowpea under water deficit

Souza

Ramos

Fiel

et al. 2019

Rev. bras. eng. agríc. ambient.

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“…However, due to the irregularity of rainfall in these regions, it is common to experience long periods without rain during the crop cycle. In this case, plant survival and crop yield will depend on strategies such as water conservation or tolerance to drought (Freitas et al, 2017). Typically, new cultivars are obtained by selection during harvest and according to their components in specific environments without evaluating the effects of drought in different growth and development stages.…”

Section: Introductionmentioning

confidence: 99%

Growth, biomass distribution, gas exchange and chlorophyll fluorescence in cowpea (Vigna unguiculata (L.) Walp.) under drought conditions

et al. 2020

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Drought modifies plant development and generates losses in agricultural production. The aim of this study was to analyze the growth, biomass distribution, gas exchange, and chlorophyll fluorescence in nine cowpea (Vigna unguiculata) genotypes under drought conditions in the greenhouse condition. A completely randomized experimental design with four replicates was used. The following genotypes (treatments) of LC-006-016, LC-029-016, LC-036-016, LC-021-016, LC-005-016, LC-009-016, LC-014-016, LC-002-016, and Caupicor-50 (control) were evaluated with irrigation for 21 days (after sowing) and 38 days of drought (DD) for a total duration of 59 days. In a simultaneous experiment, other plants of the same genotypes were irrigated for 59 days after sowing (DAS) with replacement of evapotranspirated water every three days. Measures of plant height and number of leaves were taken every four days, biomass at 59 days, gas exchange every seven days and chlorophyll fluorescence at 17, 21 and 38 DD. Moisture losses were quantified by recording the loss of soil weight every three days. The results showed that plant height reached 72.2% lower in plants under drought, while the vegetative biomass decreased by 76.3%. The photosynthesis, stomatal conductance, and transpiration were decreased 64.6%, 93.1%, and 86.9% under drought, respectively. Furthermore, intrinsic water use efficiency (A/gs) was increased almost six times. However, it was decreased when drought progressed towards the soil water content loss more than 0.0827 g.g-1. The quantum yield of photosynthesis (ΦPSII) was decreased 28.4%, 40.3% and 43.5% at 17, 21 and 38 DD, respectively, under drought condition. The principal component analysis (PCA) suggests that the genotypes with higher A/gs and those with higher biomass production show greater resistance to drought.

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“…), as it is moderately resistant to drought, can be grown under different edaphoclimatic conditions. That vegetable is widely grown and consumed globally, being used as the main source of protein [1]. For the 2012-2014 period, the average global yield was 7.32 million tons [2].…”

Section: Introductionmentioning

confidence: 99%

GYT Biplot Analysis: A New Approach for Cowpea Line Selection

Oliveira

Gravina

Rocha

et al. 2019

JEAI

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Cowpea beans is grown under different edaphoclimatic conditions throughout Brazilian regions causing them to perform differently due to the influence that environments have on genotypes. Thus, it is necessary to obtain lines adapted to the specific cultivation environments so that it can present high yield. The objective of this work was to select cowpea lines through the GYT biplot multivariate analysis. The experiment was carried out in Bom Jesus de Itabapoana, Rio de Janeiro State, Brazil, in the 2016 and 2017 harvests. The randomized block design was performed with four replications and four lines per plot. Variance analyzes and biplot plots were applied for the number of days of flowering, final planting, harvest value, housing, pod yield, length, average number of beans per pod, average grain weight per pod and grain weight. The analysis of variance showed that there is genetic variability among the strains, requiring a detailed study to select those with the best agronomic performance. The first two major components of the biplot chart explained almost all of the variation between strains. All yield characteristics were negatively correlated with the set of productivity combinations with housing and number of days for flowering. Lines 3, 10, 4, 2, 6, 12, 7 and 11 showed better average performance for yield characteristics.

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Physiological Responses of Cowpea Under Water Stress and Rewatering in No-Tillage and Conventional Tillage Systems

Cited by 27 publications

References 25 publications

Yield and water use efficiency of cowpea under water deficit

Yield and water use efficiency of cowpea under water deficit

Growth, biomass distribution, gas exchange and chlorophyll fluorescence in cowpea (Vigna unguiculata (L.) Walp.) under drought conditions

GYT Biplot Analysis: A New Approach for Cowpea Line Selection

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