Effect of two nocturnal temperatures on chlorophyll fluorescence parameters of flag leaves and panicle characteristics in seven rice (Oryza sativa L.) genotypes

Alvarado-Sanabria, Oscar H; Garcés-Varón, Gabriel; Restrepo-Díaz, Hermann

doi:10.30848/pjb2021-1(32)

Cited by 3 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the last years, rice studies in Colombia have focused on the evaluation of genotypes with resistance to high day or nighttime temperatures using physiological or biochemical traits (Sánchez-Reinoso et al, 2014;Alvarado-Sanabria et al, 2021). However, the analysis of practical, economic, and profitable techniques has gained importance in the last years in order to propose crop integrated management to ameliorate the effects of combined heat stress periods in the country (Calderón-Páez et al, 2021;Quintero-Calderón et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Foliar Growth Regulator Sprays Induced Tolerance to Combined Heat Stress by Enhancing Physiological and Biochemical Responses in Rice

Pantoja-Benavides

Garcés-Varón²,

Restrepo-Díaz

2021

Front. Plant Sci.

View full text Add to dashboard Cite

Rice yield has decreased due to climate variability and change in Colombia. Plant growth regulators have been used as a strategy to mitigate heat stress in different crops. Therefore, this study aimed to evaluate the effect of foliar applications of four growth regulators [auxins (AUX), brassinosteroids (BR), cytokinins (CK), or gibberellins (GA)] on physiological (stomatal conductance, total chlorophyll content, Fv/Fm ratio, plant canopy temperature, and relative water content) and biochemical (Malondialdehyde (MDA) and proline contents) variables in two commercial rice genotypes exposed to combined heat stress (high day and nighttime temperatures). Two separate experiments were carried out using plants of two rice genotypes, Fedearroz 67 (“F67”) and Fedearroz 2000 (“F2000”) for the first and second experiments, respectively. Both trials were analyzed together as a series of experiments. The established treatments were as follows: absolute control (AC) (rice plants grown under optimal temperatures (30/25°C day/nighttime temperatures), heat stress control (SC) [rice plants only exposed to combined heat stress (40/30°C)], and stressed rice plants and sprayed twice (5 days before and after heat stress) with a plant growth regulator (stress+AUX, stress+BR, stress+CK, or stress+GA). The results showed that foliar CK sprays enhanced the total chlorophyll content in both cultivars (3.25 and 3.65 mg g−1 fresh weight for “F67” and “F2000” rice plants, respectively) compared to SC plants (2.36 and 2.56 mg g−1 fresh weight for “F67,” and “F2000” rice plants, respectively). Foliar CK application also improved stomatal conductance mainly in “F2000” rice plants compared to their heat stress control (499.25 vs.150.60 mmol m−2s−1). Foliar BR or CK sprays reduced plant canopy temperature between 2 and 3°C and MDA content in plants under heat stress. The relative tolerance index suggested that foliar CK (97.69%), and BR (60.73%) applications helped to mitigate combined heat stress mainly in “F2000” rice plants. In conclusion, foliar BR or CK applications can be considered an agronomic strategy to help to ameliorate the negative effect of combined heat stress conditions on the physiological behavior of rice plants.

show abstract

Section: Discussionmentioning

confidence: 99%

Foliar Growth Regulator Sprays Induced Tolerance to Combined Heat Stress by Enhancing Physiological and Biochemical Responses in Rice

Pantoja-Benavides

Garcés-Varón²,

Restrepo-Díaz

2021

Front. Plant Sci.

View full text Add to dashboard Cite

show abstract

“…In experiments 2 and 3, the plants only had the main tiller with its corresponding flag leaf. Finally, the stress periods in the tests with adult plants were selected based on literature that states that rice plants are more sensitive to the effects of heat stress during these phenological stages (reproductive and maturation) ( Restrepo-Diaz and Garces-Varon, 2013 ; Alvarado-Sanabria et al., 2017 ; Alvarado-Sanabria et al., 2021 ).…”

Section: Methodsmentioning

confidence: 99%

“…Rice plants were maintained under these general growth conditions until 47 DAE when they reached phenological stage V5. Different studies have shown that this phenological stage is the right moment to establish heat stress tests on rice plants (Sańchez-Reinoso et al, 2014;Alvarado-Sanabria et al, 2017). The combined heat stress treatments were established at 80 DAE (R2 -booting) in the second experiment.…”

Section: Plant Materials and General Growth Conditionsmentioning

confidence: 99%

“…For all experiments, the combined heat stress treatment was established by setting the chambers to the following day/night temperatures: a period of high daytime (40°C for 5 hours (from 11:00 to 16:00)) and night (30°C for 5 hours (from 19:00 to 24:00)) temperatures for eight consecutive days. Stress temperatures and exposure times were selected based on previous studies (Sańchez-Reinoso et al, 2014;Alvarado-Sanabria et al, 2017). On the other hand, a group of plants transferred to the growth chamber was kept at the same greenhouse temperature (30°C day/25°C night) for eight consecutive days (absolute controls).…”

Section: Combined Heat Stress Treatmentmentioning

confidence: 99%

“…The methodology described by Alvarado-Sanabria et al (2017) was used to measure the leaf photosynthetic variables. The gas exchange readings were taken at the end of the stress period to which the plants were subjected (88 DAE for the plants at phenological stage R2 and 108 DAE for the plants at phenological stage R8) using a portable infrared gas analyzer (LI-6400XT; LI-COR, Lincoln, NE) between 10:00 a.m. and 3:00 p.m.…”

Section: Variables Determined In E3mentioning

confidence: 99%

See 2 more Smart Citations

Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress

Pantoja-Benavides

Garcés-Varón²,

Restrepo-Díaz³

2022

Front. Plant Sci.

View full text Add to dashboard Cite

The effect of different foliar sprays numbers of cytokinins – (CK) and brassinosteroids – (BR) on the physiological, biochemical, and panicle parameters of rice plants subjected to combined heat stress (high day/night temperatures) were studied in three different experiments. The treatments established for the first (E1) and second (E2) experiments were the following: i) absolute control, ii) stress control, iii) heat stress + one foliar spray of CK, iv) heat stress + two foliar sprays of CK, v) heat stress + three foliar sprays of CK, vi) heat stress + one foliar spray of BR, vii) heat stress + two foliar sprays of BR, or viii) heat stress + three foliar sprays of BR. For the third experiment (E3), the treatments were the following: i) absolute control, ii) stress control, iii) heat stress + three foliar applications of CK, iv) heat stress + three foliar applications of BR. Rice-stressed plants and sprayed with three foliar sprays of CK or BR had a better stomatal conductance in E1 and E2 compared to their heat-stressed control. The relative tolerance index suggests that three CK or BR applications helped to mitigate the combined heat stress in both experiments. The foliar CK or BR applications at the flowering and grain-filling stages in rice-stressed plants increased Fv/Fm ratio and panicle characteristics (number of filled spikelets and the percentage of panicle blanking in E3). In conclusion, foliar applications of BR or CK can be considered an agronomic strategy to help improve the negative effect of combined heat stress conditions on the physiological behavior of rice plants during different phenological stages.

show abstract

Alelopatía del extracto de Campomanesia lineatifolia sobre Taraxacum officinale

Cepeda

Balaguera-López

Vega

2021

CTA

View full text Add to dashboard Cite

Debido al uso indiscriminado de herbicidas de síntesis química y su residualidad en el suelo, se están implementando alternativas para el manejo de malezas, entre las que se encuentra la alelopatía, que busca hacer control por medio de compuestos naturales derivados de plantas. En este estudio se evaluó extracto de las semillas de Campomanesia lineatifolia en Taraxacum officinale. Se utilizó un diseño completamente al azar en la fase I (sobre semillas), y en la fase II (sobre plantas), aplicando cuatro tratamientos correspondientes a las concentraciones del extracto (0, 3, 6 y 9 %). En la fase I con la germinación se estableció porcentaje, velocidad media y tiempo medio de germinación; en la fase II se determinó la incidencia y la severidad del daño producido por el extracto, efectos en la fluorescencia de clorofila a través de la eficiencia máxima del fotosistema II, tasa de transporte de electrones, quenching fotoquímico y quenching no fotoquímico. En la fase I, las concentraciones de 3, 6 y 9 % inhibieron totalmente la germinación; en la fase II, para estos mismos tratamientos, la incidencia fue del 100 %, y la severidad más alta (65,5 %) se presentó con el tratamiento de 9 %. A su vez, la fluorescencia de la clorofila presentó reducciones significativas en los valores de las variables determinadas, pero en esta fase no hubo muerte de las plantas ni necrosis de los tejidos. Se encontró efecto alelopático del extracto de semillas de C. lineatifolia sobre la germinación y fisiología de T. officinale.

show abstract

Effect of two nocturnal temperatures on chlorophyll fluorescence parameters of flag leaves and panicle characteristics in seven rice (Oryza sativa L.) genotypes

Cited by 3 publications

References 22 publications

Foliar Growth Regulator Sprays Induced Tolerance to Combined Heat Stress by Enhancing Physiological and Biochemical Responses in Rice

Foliar Growth Regulator Sprays Induced Tolerance to Combined Heat Stress by Enhancing Physiological and Biochemical Responses in Rice

Foliar cytokinins or brassinosteroids applications influence the rice plant acclimatization to combined heat stress

Alelopatía del extracto de Campomanesia lineatifolia sobre Taraxacum officinale

Contact Info

Product

Resources

About