Matter Accumulation and Photosynthetic Responses of Macaw Palm to Cyclical Drought

Mota, Clenilso Sehnen; Cano, Marco Antônio Oliva

doi:10.1590/1983-21252016v29n409rc

Cited by 13 publications

(12 citation statements)

References 18 publications

(38 reference statements)

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“…The reduction of water availability possibly caused stress to the plants, affecting several physiological processes, such as stomatal opening, decreasing stomatal conductance, perspiration, and photosynthesis, consequently leading to the decline of biomass production (Cechin et al, 2015;Mota & Cano, 2016). Table 2.…”

Section: /7mentioning

confidence: 99%

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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Section: /7mentioning

confidence: 99%

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

Oliveira

Gama

Dombroski

et al. 2018

Agraria

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“…The observed reduction in leaf water potential may be related to the sugars accumulation in leaves, which together with other physiological mechanisms, such as stomatal closure and reduced transpiration, contribute to the maintenance of tissue hydration. Other species also showed reduced water potential when under conditions of low water availability (Ronchi et al, 2015, Mota & Cano, 2016.…”

Section: Plant Water Relationsmentioning

confidence: 99%

Physiological Responses of Physalis angulata Plants to Water Deficit

Leite¹,

Nascimento²,

Tanan³

et al. 2018

JAS

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It’s known that drought affects crop growth, however, little is known about the physiological responses developed under these conditions by underexploited species, such as Physalis angulata. This study aimed at assessing the physiological responses of Physalis angulata plants after 40 days under different water availability (100%, 80%, 60%, 40% and 20% of pot field capacity). In this research, the effects of the water deficit on the relative water content, water potential, gas exchange, sugars accumulation and activity of nitrate reductase were evaluated. Water relations were affected mainly in plants under severe water deficit, however, the variables remained stable when cultivated at sub-optimal levels of field capacity. Gas exchanges were also affected by water deficit, with reduction in carbon assimilation, internal carbon, stomatal conductance and transpiration, as well as increased leaf temperature and water use efficiency. Plants accumulated sugars as a mechanism of tolerance to severe water deficit, while nitrate reductase activity was reduced. P. angulata plants develop important strategies to tolerate water deficit, contributing to the establishment of crops under low water availability.

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“…Palms occurring in savanna environments generally have higher stomatal conductance (g s ) and lower water use efficiency than woody and herbaceous species (Rossatto & Franco 2017). However, some palm species are described as resistant to drought, including the macauba palm (Acrocomia aculeata), which is also distributed in dry regions throughout the American tropics (Oliveira et al 2002;Gomes et al 2008;Pires et al 2013;Medeiros et al 2015;Mota & Cano 2016). The macauba palm grows in large populations either in degraded or natural areas with relatively fertile soils and annual rainfall of less than 1,500 mm (Motta et al 2002;Ratter et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…The macauba palm grows in large populations either in degraded or natural areas with relatively fertile soils and annual rainfall of less than 1,500 mm (Motta et al 2002;Ratter et al 2003). Besides having efficient response mechanisms for water deficit, such as efficient stomatal control, increased water use efficiency and rapid recovery after rehydration (Mota & Cano 2016;Oliveira et al 2016), A. aculeata also exhibits considerable resilience to fire (Bicalho et al 2016) and photosynthetic adjustments that allow its establishment in various light conditions (Dias et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…While the effects of water scarcity on A. aculeata have been addressed by some works (Mota & Cano 2016;Oliveira et al 2016), its interaction with increasing [CO 2 ] caused by climate change remain to be elucidated. This study tests the hypothesis that the response of macauba palm to reduced soil water content is attenuated by long-term increase in [CO 2 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Increased atmospheric CO2 changes the photosynthetic responses of Acrocomia aculeata (Arecaceae) to drought

2019

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Water availability is the main factor that explains current patterns of palm abundance. However, the interaction between water stress and increasing atmospheric CO 2 concentrations caused by climatic change and its effects on palm physiology remain poorly known. Macauba palm is a widespread Neotropical species commonly found in ecosystems subjected to seasonal drought and has potential use in oil production. The present work investigated the influence of increased CO 2 concentrations on photosynthetic responses to drought in macauba palm plants. Exposure to increased CO 2 concentrations led to up-regulation of photosynthesis through higher stomatal conductance and improved light and water use efficiency. Macauba palm plants under water stress, irrespective of CO 2 concentration, were able to maintain constant levels of proline and chlorophyll, while preventing oxidative damage. Plants grown at higher CO 2 concentrations were more capable of recovering from drought due to higher Rubisco carboxylation rate (Vc max) and electron transport rate (J max), which prevented a reduction in total dry mass at the end of the stress period. Stomatal control of photosynthesis, coupled with the prevention of severe damage under stress, would allow efficient biomass production by the macauba palm under future scenarios of climate change.

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Matter Accumulation and Photosynthetic Responses of Macaw Palm to Cyclical Drought

Cited by 13 publications

References 18 publications

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

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

Physiological Responses of Physalis angulata Plants to Water Deficit

Increased atmospheric CO2 changes the photosynthetic responses of Acrocomia aculeata (Arecaceae) to drought

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