&lt;b&gt;Photosynthetic pigments and gas exchange in castor bean under conditions of above the optimal temperature and high CO&lt;sub&gt;2&lt;/sub&gt;

Silva, Fabíola Vanessa de França; Mendes, Bruna da Silva; Rocha, M. do S.; Neto, José Félix de Brito; Beltrão, N. E. de M.; Sofiatti, Valdinei

doi:10.4025/actasciagron.v37i3.19075

Cited by 9 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This phenomenon is mostly due to the increase in osmotic potential and surrounding temperature because this stress negatively impacts cell turgor. Silva et al (2015) similarly reported that an increase in temperature may lead to various metabolic disorders and, consequently, to the rupture of cell membrane and leakage of intracellular electrolytes.…”

Section: Resultsmentioning

confidence: 99%

Germination and Initial Growth of Cowpea Cultivars Under Osmotic Stress and Salicylic Acid

et al. 2018

View full text Add to dashboard Cite

Cowpea is one of the major food crops in Northeast Brazil, where it is commonly cultivated in the semi-arid regions with limited water availability. It is important to study the elicitors associated with cowpea to mitigate any deleterious effects of abiotic stress on the initial establishment of this crop. In this study, we aimed to evaluate the morphophysiological changes in cowpea cultivars under osmotic stress with seeds soaked in salicylic acid. The germination test was conducted in B.O.D germination chambers. The seeds of three cowpea cultivars: BRS Tumucumaque, BRS Aracê, and BRS Guariba, were germinated at five osmotic potentials (0.0; -0.2; -0.4; -0.6, and -0.8 MPa) after three pre-treatments: pre-soaking in deionized water, pre-soaking in salicylic acid, and without pre-soaking. The following parameters were evaluated: germination, germination speed index, seedling height, total phytomass, contents of chlorophyll ‘a’ and ‘b’, carotenoid content, electrolyte leakage, water content, and proline content. Our results indicate that salicylic acid promotes reduction in the harmful effects of abiotic stress, which is reflected in the increase in germination percentage, seedling height, and chlorophyll and carotenoid content as well as in the adjustment of electrolyte leakage and increase in proline content under induced water stress conditions. The cultivar BRS Guariba proved to be more tolerant to water deficit during germination and initial growth stages, when the seeds were treated with salicylic acid (1 mM).

show abstract

Section: Resultsmentioning

confidence: 99%

Germination and Initial Growth of Cowpea Cultivars Under Osmotic Stress and Salicylic Acid

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Observa-se o maior índice de clorofila b nas folhas das variedades de milho, submetidas à temperatura de 20 o C. Silva et al (2015), em seu estudo com análise de pigmentos fotossintéticos e trocas gasosas em feijão sob condições de variação da temperatura e concentração de CO2, verificaram que a redução de temperatura, ao longo dos cultivos das plantas, promove uma diminuição da síntese e acúmulo de clorofilas a, b e total nas folhas.…”

Section: Discussionunclassified

Simulação do efeito da variação da temperatura ambiente na germinação de variedades de milho

Carvalho¹,

Bezerra²,

Reis

et al. 2017

J. Env. Anal. Progr.

View full text Add to dashboard Cite

A B S T R A C TIncreases in room temperature may significantly influence the germination process of several plant species. It can directly interfere directly with physiological, biochemical and other activities, thus altering the maximum seed capacity to activate seedling emergence, as well as the morphological Plants. The objective of this study was to evaluate the effect of temperature on germination of three varieties of corn. It was used three different maize varieties: BRS Assum black, BRS011, and BRS033 Asa Branca. The treatments consisted of three controlled temperature: 20°C and 40°C and 30°C. The variables analyzed were percentage of germination; germination speed index; mean germination time; germination frequency; height change and stem; stem diameter; number of leaves; chlorophyll a, b, overall; fresh and dry stem, leaf and root. The Tukey test was applied at 5%, in the variables when significant. The 30°C temperature range is ideal for germination and early development of corn seedlings. The varieties studied do not differ significantly for dry mass production, except the roots, as well as the biometric variables. There are no differences between varieties in the production of chlorophyll. The temperature of 30 proved that influences the increased production of chlorophyll A and total; stem and leaves dry weight as well as the biometric variables. Keywords: Emergence, seedling, variables, production. R E S U M OAumentos na temperatura ambiente podem influenciar de forma significativa o processo de germinação de diversas espécies vegetais. Podem interferir diretamente em atividades fisiológicas, bioquímicas entre outras, alterando desta forma a máxima capacidade das sementes em ativar a emergência das plântulas, bem como a formação morfológica das plantas. O objetivo desse estudo foi simular em câmaras de crescimento o efeito de diferentes temperaturas na germinação de três cultivares de milho: BRS Assum preto, BRS011 e BRS033 Asa Branca. O experimento foi implantado a partir da utilização dos tratamentos formados por três temperaturas controladas: 20º, 30º e 40ºC. As variáveis analisadas foram percentuais de germinação; índice de velocidade de germinação; tempo médio de

show abstract

“…Parameters such as photosynthetic rate, stomatal conductance, and transpiration rate were measured using an infrared gas analyzer (IRGA) system (LI-COR USA Model LI6400, LE, USA) as per the method employed by Silva et al [22], and their corresponding units are as follows: photosynthetic rate (PR, µmol CO 2 m −2 s −1 ), stomatal conductance (SC, mole H 2 O m −2 s −1 ), and transpiration rate (TR, mmol H 2 O m −2 s −1 ).…”

Section: Physiological Parametersmentioning

confidence: 99%

Evaluation of Effect of Brassinolide in Brassica juncea Leaves under Drought Stress in Field Conditions

et al. 2021

View full text Add to dashboard Cite

Drought stress is considered to be a major factor responsible for reduced agricultural productivity, because it is often linked to other major abiotic stresses, such as salinity and heat stress. Understanding drought-tolerance mechanisms is important for crop improvement. Moreover, under drought conditions, it is possible that growth regulators are able to protect the plants. Brassinosteroids not only play a regulatory role in plant growth, but also organize defense mechanisms against various tresses. This study aimed to evaluate the effect of brassinolide on physio-biochemical amendment in two contrasting cultivars (drought-tolerant RH 725, and drought-sensitive RH 749) of Brassica juncea under drought stress. Two foliar sprayings with brassinolide (10 and 20 mg/L) were carried out in both cultivars (RH 725 and RH 749) at two stages—i.e., flower initiation, and 50% flowering—under stress conditions. The results clearly revealed that the activities of antioxidative enzymes and non-enzymatic antioxidants (carotenoids, ascorbic acid, and proline) increased significantly in RH 725 at 50% flowering, whereas 20 mg/L of brassinolide showed the most promising response. The different oxidative stress indicators (i.e., hydrogen peroxide, malondialdehyde, and electrolyte leakage) decreased to a significant extent at 20 mg/L of brassinolide spray in RH 725 at 50% flowering. This study indicates that brassinolide intensifies the physio-biochemical attributes by improving the antioxidant system and photosynthetic efficiency in RH 725 at 50% flowering. It is assumed that enhanced production of proline, improvement of the antioxidant system, and reduction in the amount of stress indicators impart strength to the plants to combat the stress conditions.

show abstract

<b>Photosynthetic pigments and gas exchange in castor bean under conditions of above the optimal temperature and high CO<sub>2</sub>

Cited by 9 publications

References 23 publications

Germination and Initial Growth of Cowpea Cultivars Under Osmotic Stress and Salicylic Acid

Germination and Initial Growth of Cowpea Cultivars Under Osmotic Stress and Salicylic Acid

Simulação do efeito da variação da temperatura ambiente na germinação de variedades de milho

Evaluation of Effect of Brassinolide in Brassica juncea Leaves under Drought Stress in Field Conditions

Contact Info

Product

Resources

About