Tolerância ao déficit hídrico em genótipos de feijão-caupi

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

doi:10.1590/s1415-43662011000800013

Cited by 79 publications

(73 citation statements)

References 20 publications

(26 reference statements)

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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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“…Trabalhando com restrição hídrica em Vigna unguiculata (L.) Walp., Nascimento et al (2011) notaram uma elevação média de 3,5°C na temperatura média foliar quando os genótipos foram submetidos ao estresse. A diferença de temperatura foliar entre plantas submetidas ou não ao estresse fundamentase no status hídrico, no comportamento estomático e na perda de calor latente por meio da transpiração, apresentando variações quanto à tolerância em função da espécie, do ambiente, da intensidade, da duração e da hora do dia (Nogueira et al, 2001).…”

Section: Resultsunclassified

Avaliação morfofisiológica em mudas de Handroanthus impetiginosus (Mart. ex DC.) Mattos durante a rustificação

et al. 2014

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RESUMOEste trabalho objetivou quantificar os efeitos do manejo hídrico durante a rustificação de mudas de Handroanthus impetiginosus, por meio da termometria foliar e por parâmetros morfométricos de qualidade. Os tratamentos foram: irrigação diária (controle), a cada dois, três e quatro dias, em 60 mudas por tratamento, durante quatro semanas. As mensurações envolveram a medição da temperatura foliar (TF), os incrementos na altura, no diâmetro de colo e na massa seca radicular. As quantificações da TF ocorreram ao final do ciclo de cada manejo de irrigação e, para as demais variáveis, realizaram-se as análises no início e no final da rustificação. Mudas de H. impetiginosus irrigadas diariamente apresentaram maior incremento em diâmetro em relação às irrigadas a cada três dias e as mudas irrigadas a cada quatro dias apresentaram maior crescimento do sistema radicular e redução no crescimento aéreo. Contudo, o uso da termometria infravermelho permitiu aferir a TF em mudas de H. impetiginosus durante a rustificação, verificando que, com o prolongamento do período de estresse hídrico, houve o aumento gradativo da temperatura foliar, sendo a maior delas observada em mudas irrigadas a cada quatro dias.Palavras-chave: déficit hídrico, ipê-roxo, manejo de mudas, temperatura foliar. Morphophysiological Evaluation in Seedlings of Handroanthus impetiginosus (Mart. ex DC.) Mattos During Hardening ABSTRACTThe present study aimed to quantify the effects of hydric management during the hardening process of Handroanthus impetiginosus seedlings by means of foliar thermography and morphometric parameters of quality. Irrigation treatments of 60 seedlings each were carried out at the following frequencies: daily (control), and every two, three, and four days for four weeks. Measures of leaf temperature (LT), height increment, collar diameter, and root dry mass were performed. Quantification of LT occurred at the end of each irrigation management cycle and analysis of the other variables studied was performed at the beginning and end of the hardening process. Seedlings of H. impetiginosus irrigated daily presented higher diameter increment in relation to those irrigated every three days, and the seedlings irrigated every four days showed higher root system growth and reduction of aerial part growth. The use of infrared thermometry allowed LT assessment in seedlings of H. impetiginosus during hardening. It was possible to verify that the longer the water stress period, the higher the leaf temperature, with the highest temperature observed in seedlings irrigated every four days.

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“…The parents were six cowpea genotypes within three cultivars (BRS Paraguaçu, BRS Xiquexique, and Santo Inácio) and three lines (Pingo de Ouro-1-2, CNCx698-128G, and MNC99-510F-16-1) that had previously been selected based on studies of water deficit tolerance in the cowpea Nascimento et al, 2011).…”

Section: Methodsmentioning

confidence: 99%

Diallelic analysis to obtain cowpea (Vigna unguiculata L. Walp.) populations tolerant to water deficit

Rodrigues¹,

Damasceno‐Silva²,

Rocha³

et al. 2016

Genet. Mol. Res.

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ABSTRACT. The purpose of this study was to identify parents and obtain segregating populations of cowpea (Vigna unguiculata L. Walp.) with the potential for tolerance to water deficit. A full diallel was performed with six cowpea genotypes, and two experiments were conducted in Teresina, PI, Brazil in 2011 to evaluate 30 F 2 populations and their parents, one under water deficit and the other under full irrigation. A triple-lattice experimental design was used, with six 2-m-long rows in each plot. Sixteen plants were sampled per plot. The data were subjected to analysis of variance, and general and specific combining ability estimates were obtained based on the means. Additive effects were more important than non-additive effects, and maternal inheritance had occurred. The genotypes BRS Xiquexique, Pingo de Ouro-1-2, and MNC99-510F-16-1 were the most promising for use in selection programs aimed at water deficit tolerance. The hybrid combinations Pingo de Ouro-1-2 x BRS Xiquexique, BRS Xiquexique x Santo Inácio, CNCx 698-128G x MNC99-510F-16-1, Santo Inácio 2 E.V. Rodrigues et al.

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Tolerância ao déficit hídrico em genótipos de feijão-caupi

Cited by 79 publications

References 20 publications

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

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

Avaliação morfofisiológica em mudas de Handroanthus impetiginosus (Mart. ex DC.) Mattos durante a rustificação

Diallelic analysis to obtain cowpea (Vigna unguiculata L. Walp.) populations tolerant to water deficit

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