Competition between drought-tolerant upland rice cultivars and weeds under water stress condition

Cerqueira, Fernando Barnabé; Erasmo, Eduardo Andrea Lemus; Silva, J.I.C.; Nunes, Thomas Vieira; Carvalho, Gabriela Pereira de; Silva, A.A.

doi:10.1590/s0100-83582013000200006

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…The higher the proportion of plants in the association (competitor or crop), the greater the losses in variables of rice or even weed; this demonstrates again the competition of species for the same resources. The results of this study are similar to several others in the literature, such as Cerqueira et al (2013) when analyzed Spermacoce verticillata competing with rice cultivars Jatobá and Catetão; Agostinetto et al (2008) evaluated rice competing with barnyardgrass; and Galon et al (2011) who studied barley in competition with ryegrass. All the above authors found greater reductions in morphological variables with increasing proportion of competitor plants in the association.…”

Section: Resultssupporting

confidence: 87%

Competitividade relativa de cultivares de arroz irrigado com Aeschynomene denticulata

et al. 2015

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This study evaluated the relative competitive ability of rice cultivars in the presence of a joint-vetch (Aeschynomene denticulata) biotype, at different replacement levels of plants in the association. The experiments were conducted in a randomized complete block design with four replications. First, it was determined the population of plants in which the final dry mass remains constant, both for the rice and for the joint-vetch (24 plants per pot). Later, two experiments were carried out to evaluate the competitiveness of the rice cultivars BRS Querência and BRS Sinuelo CL with joint-vetch plants, both conducted in replacement series, in different crop and weed combinations, varying the relative proportions of plants per pot (24:0, 18:6, 12:12, 6:18 and 0:24). Competitiveness of each species was analyzed by diagrams applied to replacement experiments and by the relative competitiveness indices. Fifty days after the emergence, tillering or number of leaves, height, leaf area and shoot dry mass were determined. Competition occurred between the rice cultivars and the joint-vetch, both were adversely affected, irrespective of the plant proportion. This resulted in reductions in all evaluated variables. Different competitive abilities were observed between rice cultivars in the presence of joint-vetch. The 'BRS Querência' was more competitive than the 'BRS Sinuelo CL' for all plant proportions and variables tested.

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Section: Resultssupporting

confidence: 87%

Competitividade relativa de cultivares de arroz irrigado com Aeschynomene denticulata

et al. 2015

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“…Number of leaves per plant (NL), leaf area (LA), leaf dry mass (LDM), stem (SDM), root (RDM) and total (TDM) of Commelina benghalensis in competition with cowpea, under the irrigated regime and of water deficit. Similar results were described by Cerqueira et al (2013) when evaluating the effects of the water deficit and the competition of two drought-tolerant highland rice cultivars with the Spermacoce verticillata specie, showing that competition and/or water deficit reduced leaf area and dry mass of the vegetative components (shoot, root and total) of rice and weed cultivars.…”

Section: /7supporting

confidence: 81%

Competition between cowpea and weeds for water: Effect on plants growth

Oliveira

Gama

Dombroski

et al. 2018

Agraria

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ABSTRACT:Water is the most important resource for agricultural production. The understanding of water competition mechanisms may lead to the development of new control strategies or coexistence with certain weed species, especially in situations where water is scarce. The objective of this work was to evaluate the competition between cowpea and weeds by water under the effect on plant growth. It was carried out experiment in greenhouse in the period from September to November 2015, in a randomized complete block design, with four replications. The treatments were arranged in factorial 5 x 2, with the first factor corresponding to the competition arrangements between the species (V. unguiculata + C. benghalensis; V. unguiculata + W. indica; V. unguiculata, C. benghalensis and W. indica in monoculture), and the second of water regimes (irrigated and water deficit). The water deficit reduces the growth of cowpea plants, C. benghalensis and W. indica. The competition between plants increases the effects of temporary water deficit in the soil. The W. indica leaf is the organ most affected by the water deficit. The weed specie W. indica has greater capacity competition for water with V. unguiculata than C. benghalensis. Key words: Commelina benghalensis; interference; Vigna unguiculata; Waltheria indica; water stressCompetição entre feijão-caupi e plantas daninhas por água: Efeito no crescimento das plantas RESUMO: A água é o recurso mais importante para a produção agrícola. O entendimento dos mecanismos de competição por água pode propiciar o desenvolvimento de novas estratégias de controle ou convivência com determinadas espécies de plantas daninhas, principalmente nas situações em que a água é escassa. Objetivou-se com este trabalho avaliar a competição entre feijão-caupi e plantas daninhas por água sob o efeito no crescimento das plantas. Foi realizado experimento em casa de vegetação no período de setembro a novembro de 2015, em delineamento em blocos casualizado, com quatro repetições. Os tratamentos foram arranjados em fatorial 5 x 2, com o primeiro fator correspondente aos arranjos de competição entre as espécies (feijão-caupi + trapoeraba; feijão-caupi + malva-branca; feijão-caupi, trapoeraba e malva-branca em monocultivo), e o segundo dos regimes hídricos (irrigado e déficit hídrico). O déficit hídrico reduz o crescimento das plantas de feijão-caupi, Commelina benghalensis e Waltheria indica. A competição entre plantas aumenta os efeitos do déficit hídrico temporário no solo. A folha de W. indica é o órgão mais afetado pelo déficit hídrico. A espécie daninha W. indica tem maior capacidade de competição por água com o feijão-caupi do que a C. benghalensis. Palavras-chave: Commelina benghalensis; interferência; Vigna unguiculata; Waltheria indica; estresse hídricoCompetition between cowpea and weeds for water: Effect on plants growth Rev. Bras.

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“…Leaf morphology and associated traits have been suggested as one of the parameters for selecting drought-tolerant genotypes (Biswal and Kohli, 2013). The presence of genetic variability for leaf rolling and correlation between leaf area index and drought have also been studied by various scientist, indicating the probable role of leaf traits as a measure of drought susceptibility or tolerance (Subashri et al , 2009; Farooq et al , 2009; Salunkhe et al , 2011; Cerqueira et al , 2013; Singh et al , 2013; Kumar et al , 2014; Sokoto and Muhammad 2014). Our results revealed, sufficient genetic variation in leaf and root morphology among selected wild species germplasm accessions.…”

Section: Discussionmentioning

confidence: 99%

Identification of drought stress tolerance in wild species germplasm of rice based on leaf and root morphology

Neelam

Sahi

Kumar

et al. 2017

Plant Genet. Resour.

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Drought is the major abiotic constraint to the rice production in the rain-fed areas across Asia and sub-Saharan Africa. Wild species of Oryza offer a wide spectrum of adaptive traits and can serve as potential donors of biotic and abiotic stress tolerance. At the Punjab Agricultural University, we are maintaining an active collection of 1630 accessions of wild species germplasm (AA, CC, BBCC and CCDD) of rice. These accessions were screened to assess genetic variation for drought tolerance under field conditions. Severe water stress was imposed at the late vegetative stage by withholding water initially for 25 d and then extended further to 35 d during kharif season in the years 2013–14 and 2015–16. The tolerance score for drought stress was based on the extent of leaf rolling and leaf drying. Based on the 2 years’ data, seven accessions from Oryza rufipogon, four from Oryza longistaminata and one each from Oryza officinalis and Oryza latifolia were found tolerant to drought stress. These selected accessions were further phenotype for root morphology. The average root length among the selected accessions ranges between 36 and 80 cm and the number of primary roots vary from 30 to 87 cm. The O. rufipogon accession IRGC 106433, O. longistaminata accession IRGC 92656A, O. officinalis accession IRGC 101152 and O. latifolia accession IRGC 80769 showed approximately 2–2.5 times longer root length and number than the indica rice elite cultivar PR121. The results indicated potentiality of selected wild species germplasm for conferring drought tolerance to the elite cultivars.

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Competition between drought-tolerant upland rice cultivars and weeds under water stress condition

Cited by 10 publications

References 6 publications

Competitividade relativa de cultivares de arroz irrigado com Aeschynomene denticulata

Competitividade relativa de cultivares de arroz irrigado com Aeschynomene denticulata

Competition between cowpea and weeds for water: Effect on plants growth

Identification of drought stress tolerance in wild species germplasm of rice based on leaf and root morphology

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