Identification of cowpea genotypes for drought tolerance

Bastos, E. A.; Nascimento, Sebastião Pereira do; Silva, Everaldo Moreira da; Filho, F. R. Freire; Gomide, R. L.

doi:10.1590/s1806-66902011000100013

Cited by 66 publications

(56 citation statements)

References 7 publications

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“…Regarding the mass of 100 beans, mean values in cowpeas cultivated under full water supply were significantly higher than those in cowpeas exposed to water limiting conditions . Results from the present study confirmed that drought stress exerts a negative influence on cowpea productivity, as has been previously reported (Uarrota, 2010;Bastos et al, 2011;Nascimento et al, 2011).…”

Section: Discussionsupporting

confidence: 92%

Selection of cowpea progenies with enhanced drought-tolerance traits using principal component analysis

Sousa¹,

Damasceno‐Silva²,

Bastos³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. Vigna unguiculata (L.) Walp (cowpea) is a food crop with high nutritional value that is cultivated throughout tropical and subtropical regions of the world. The main constraint on high productivity of cowpea is water deficit, caused by the long periods of drought that occur in these regions. The aim of the present study was to select elite cowpea genotypes with enhanced drought tolerance, by applying principal component analysis to 219 first-cycle progenies obtained in a recurrent selection program. The experimental design comprised a simple 15 x 15 lattice with 450 plots, each of two rows of 10 plants. Plants were grown under water-deficit conditions by applying a water depth of 205 mm representing one-half of that required by cowpea. Variables assessed were flowering, maturation, pod length, number and mass of beans/pod, mass of 100 beans, and productivity/plot. Ten elite cowpea genotypes were selected, in which principal components 1 and 2 encompassed variables related to yield (pod length, beans/pod, and productivity/plot) and life precocity (flowering and maturation), respectively.

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Section: Discussionsupporting

confidence: 92%

Selection of cowpea progenies with enhanced drought-tolerance traits using principal component analysis

Sousa¹,

Damasceno‐Silva²,

Bastos³

et al. 2015

Genet. Mol. Res.

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“…Water stress interferes with several physiological plant processes. In the case of cowpea, other authors have observed significant reductions of physiological processes as a result of water stress, such as stomatal conductance and leaf water potential (MENDES et al, 2007;NASCIMENTO et al, 2011) as well as total chlorophyll content of leaves (BASTOS et al, 2011). As a consequence, the weight of the aerial parts is reduced.…”

Section: Resultsmentioning

confidence: 98%

“…Also, water stress at intervals of 15 to 20 days in the vegetative phase delayed the onset of flowering. Bastos et al (2011), studying the cultivar Tracuateua -192, found significant differences in the number of pods per plant, number of grains per pod, weight of 100 grains and productivity when subjected to moderate water stress in the reproductive phase. Figure 4 shows the LAI variability along the growth cycle in the three experimental years.…”

Section: Resultsmentioning

confidence: 99%

Cowpea Leaf Area, Biomass Production and Productivity Under Different Water Regimes in Castanhal, Pará, Brazil

et al. 2017

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-This work evaluated the effect of soil water availability on growth and productivity variables of cowpea in northeastern Pará, Brazil. The experiment was carried out in a field of 2,100 m 2 at the experimental site of the Federal Rural University of Amazon, during the driest season of the years 2011, 2012 and 2013, in a completely randomised design with two treatments (irrigated and non-irrigated), both with 12 replications in the reproductive phase (2012 and 2013). Growth and productivity data were submitted to analysis of variance with two variation factors (water regime and experimental year) at 5% probability. Student's t-test at 5% probability was used in the means of the stomatal conductance data, since this was monitored only in 2012. Keywords: Vigna unguiculata. Productivity. Water availability. PRODUÇÃO DE ÁREA FOLIAR E BIOMASSA E PRODUTIVIDADE DO FEIJÃO-CAUPI SOB REGIMES HÍDRICOS EM CASTANHAL, PARÁRESUMO -O objetivo deste trabalho foi avaliar o efeito da disponibilidade de água no crescimento e produtividade do feijão-caupi cultivado no Nordeste do estado do Pará, Brasil. O experimento foi realizado em uma área de 2.100 m 2 na Fazenda Escola da Universidade Federal Rural da Amazônia, durante o período menos chuvoso de 2011, 2012 e 2013, em um delineamento inteiramente casualizado com dois tratamentos (irrigado e não irrigado), com 12 repetições na fase reprodutiva (2012 e 2013). Dados de crescimento e de produtividade foram submetidos a análise de variância com dois fatores de variação (regime hídrico e ano experimental) a 5% de probabilidade. Utilizou-se o teste t de Student a 5% de probabilidade nas médias de condutância estomática por ser monitorada apenas em 2012. A produção final de biomassa apresentou redução de 54,3% em 2012 e de 26,4% em 2013 devido a ocorrência de uma deficiência hídrica (DEF) de 76 e de 26 mm, respectivamente. A condutância estomática média foi reduzida em 73% na fase de enchimento de grãos devido a menor disponibilidade de água nesta fase. A produtividade média do caupi sob baixa deficiência hídrica atingiu 1.257 kg ha -1 em 2012 e 1.396 kg ha -1 e 2013. A redução da água diminuiu em 72% e 41% o rendimento do caupi (teste F, p < 0,05) em 2012 e 2013, respectivamente. A deficiência hídrica acumulada na fase reprodutiva causou redução de 47% no máximo IAF em 2012 (DEF de 76 mm) e de 13% em 2013 (DEF de 26 mm).Palavras-chave: Vigna unguiculata. Produtividade. Disponibilidade hídrica.

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“…Entre os genótipos existe grande variabilidade quanto a essa característica de sobreviver em condições de deficiência hídrica. As principais mudanças que uma planta submetida ao estresse hídrico apresenta são: menor crescimento, redução da área foliar, maior crescimento do sistema radicular, enrolamento das folhas, redução de turgor, fechamento dos estômatos, abscisão floral e alteração na permeabilidade da cutícula (XOCONOSTLE-CAZARES et al, 2010;BASTOS et al, 2011;VARSHNEY et al, 2011;SILVA et al, 2011). Todas essas alterações citadas anteriormente limitam a produtividade, ocasionando danos ao produtor.…”

Section: Introductionunclassified