Effects of Cytokinin Preparations on the Stability of the Photosynthetic Apparatus of Two Wheat Cultivars Experiencing Water Deficiency

Monakhova, O. F.; Chernyad’ev, I. I.

doi:10.1023/b:abim.0000046993.38857.3e

Cited by 12 publications

(8 citation statements)

References 10 publications

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“…2008f, 2009b,c), changes in photosynthetic pigments (Loggini et al. 1999) and decreased activities of Calvin cycle enzymes (Monakhova and Chernyadév 2004). Moreover, ROS production (Ma et al.…”

Section: Discussionmentioning

confidence: 99%

“…Drought stress produces changes in photosynthetic pigments and components (Loggini et al. 1999), damages photosynthetic apparatus (Fu and Huang 2001) and decreases the activities of Calvin cycle enzymes (Monakhova and Chernyadév 2004). Moreover, exposure of plants to drought quite often leads to the generation of reactive oxygen species (ROS) (Munne‐Bosch and Penuelas 2003, El‐Tayeb and Ahmed 2007, Farooq et al.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Drought Tolerance in Rice (Oryza sativa L.) by Exogenous Application of Salicylic Acid

Farooq

Basra

Wahid

et al. 2009

J Agronomy Crop Science

207

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Drought stress encumbers the rice growth predominantly by oxidative damage to biological membranes and disturbed tissue water status. In this study, the role of salicylic acid (SA) to induce drought tolerance in aromatic fine grain rice cultivar Basmati 2000 was evaluated. SA was applied as seed and foliar treatments. For seed treatment, rice seeds were soaked in 50, 100 and 150 mg l−1 aerated solution of SA for 48 h and then dried back. Treated and untreated seeds were sown in plastic pots in a phytotron. At four leaf stage, one set of plants was subjected to drought stress, while the other remained well watered. Drought was maintained at 50 % of field capacity by watering every alternate day. For exogenous application, SA was applied 50, 100 and 150 mg l−1 at five leaf stage. In the control, SA was neither applied exogenously nor as seed treatment. Drought stress severely affected the seedling fresh and dry weight, photosynthesis, stomatal conductance, plant water relations and starch metabolism; however, SA application improved the performance of rice under both normal and stress conditions. Drought tolerance in rice was well associated with the accumulation of compatible solutes, maintenance of tissue water potential and enhanced potency of antioxidant system, which improved the integrity of cellular membranes and facilitated the rice plant to sustain photosynthesis and general metabolism. Foliar treatments were more effective than the seed treatments. Foliar application with 100 mg l−1 (FA 100) was the best treatment to induce the drought tolerance and improve the performance under normal and stress conditions compared with the control or other treatments used in this study.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the Drought Tolerance in Rice (Oryza sativa L.) by Exogenous Application of Salicylic Acid

Farooq

Basra

Wahid

et al. 2009

J Agronomy Crop Science

207

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“…Esse declínio na fotossíntese pode ocorrer devido a fatores estomáticos, em virtude da redução na condutância estomática, restringindo as trocas gasosas entre a planta e o meio externo (FLEXAS; FLEXAS et al, 2004), ou por fatores não estomáticos, como danos no aparato fotossintético (FU; HUANG, 2001) e decréscimo na atividade de enzimas do Ciclo de Calvin (MONAKHOVA;CHERNYAD´EV, 2004).…”

Section: Introductionunclassified

RESPOSTAS FISIOLÓGICAS E BIOQUÍMICAS DE PLANTAS DE AROEIRA (Myracrodruon urundeuva Allemão) AO DÉFICIT HÍDRICO E POSTERIOR RECUPERAÇÃO

Costa

Freire

Bakke

et al. 2015

R_I

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A aroeira (Myracrodruon urundeuva Allemão) vem sendo explorada de forma desordenada, ocasionando redução drástica no número de indivíduos, fazendo com que passasse a fazer parte da lista de espécies ameaçadas de extinção, sendo oportuna a prioridade da conservação. No entanto, pouco se sabe a respeito de aspectos relacionados à sua fisiologia, principalmente acerca dos mecanismos fisiológicos que determinam sua tolerância à seca. O objetivo deste trabalho foi avaliar as trocas gasosas e o acúmulo de solutos orgânicos em plantas jovens de aroeira submetidas ao déficit hídrico e posterior recuperação. Plantas com doze meses de idade, mantidas em sacos plásticos pretos, contendo 5 kg de uma mistura de solo e esterco bovino (2:1) foram submetidas aos tratamentos irrigados (controle) e de déficit hídrico, o qual foi imposto através da suspensão da irrigação. Decorridos 12 dias de déficit hídrico, as plantas foram reidratadas. As plantas sob déficit hídrico apresentaram teor relativo de água de 70% ao final do período de estresse. O déficit hídrico promoveu redução progressiva na condutância estomática, na transpiração, na fotossíntese líquida e na eficiência no uso da água das plantas. A concentração intercelular de CO2 e as concentrações foliares de açúcares totais e aminoácidos solúveis totais aumentaram. Após a retomada da irrigação, ocorreu rápida recuperação no teor relativo de água, mas a recuperação da condutância estomática e da fotossíntese líquida ocorreu mais lentamente. As plantas de aroeira foram capazes de recuperar o status hídrico e o funcionamento do mecanismo estomático e fotossintético após a recuperação, demonstrando tolerância ao déficit hídrico. Palavras

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“…There is evidence that natural endogenous cytokinin levels decrease during dark-induced senescence in Cucurbita cotyledons and natural senescence in maize leaves (He et al, 2005). Some evidence indicates that cytokinins regulate the accumulation and expression of several thylakoid and stroma proteins, in Lupinus luteus cotyledons (Kusnetsov et al, 1998), etiolated cotyledons of watermelon (Longo et al, 1990) and wheat under water deficiency (Monakhova and Chernyadèv, 2004). Plants transformed with the bacterial cytokinin biosynthesis gene isopentenyl transferase (IPT) exhibited delay of leaf senescence in tobacco, maize, Arabidopsis, broccoli and other species (Smart et al, 1995;Amasino, 1995, 1996;Li et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Cytokinin promotes catalase and ascorbate peroxidase activities and preserves the chloroplast integrity during dark-senescence

Zavaleta‐Mancera

López-Delgado

Loza-Tavera

et al. 2007

Journal of Plant Physiology

149

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Effects of Cytokinin Preparations on the Stability of the Photosynthetic Apparatus of Two Wheat Cultivars Experiencing Water Deficiency

Cited by 12 publications

References 10 publications

Improving the Drought Tolerance in Rice (Oryza sativa L.) by Exogenous Application of Salicylic Acid

Improving the Drought Tolerance in Rice (Oryza sativa L.) by Exogenous Application of Salicylic Acid

RESPOSTAS FISIOLÓGICAS E BIOQUÍMICAS DE PLANTAS DE AROEIRA (Myracrodruon urundeuva Allemão) AO DÉFICIT HÍDRICO E POSTERIOR RECUPERAÇÃO

Cytokinin promotes catalase and ascorbate peroxidase activities and preserves the chloroplast integrity during dark-senescence

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