Evaluation of water-stress tolerance of Acala SJ 2 and Auburn 2 cotton cultivars in a phenotyping platform

Guimarães, C. M.; Stone, L. F.; Brito, Giovani Greigh de; Heuert, Jair

doi:10.4136/ambi-agua.2105

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…of rain regime, besides of increases in frequency of heat and cold waves as predicted to be increasingly common in next decades. In this sense, abiotic and biotic stresses are the major constraints for agricultural productivity on the global scale and projected climate changes could increase their negative effects in the future (Brito et al, 2010(Brito et al, , 2011Diola et al, 2011Diola et al, , 2013Weber et al, 2014;Brito et al, 2016b;Guimarães et al, 2017). Beyond of the predict impact of these extreme event on global population remain unclear, its occurrence will probably influence the plant species distributions, productivity, carbon balance and negatively impacting on physiological resilience capacity of plants in a specific environment.…”

Section: Introductionmentioning

confidence: 99%

Non-invasive Physiological Approaches for Plant Phenotyping: Rice Responses to Heat Stress

Brito¹,

Moraes²,

Moura³

et al. 2019

JAS

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Rice (Oryza sativa L.) can be negatively impacted by supraoptimum temperatures (above 33 °C) during initial reproductive phase (R3-R5); development and adoption of approaches via non-invasive physiological phenotyping can lead to help build new plant types to face the current extreme climatic events such as future forecasts. For this purpose, screening process was designed to progressively decrease the genotypes number via non-invasive phenotyping approaches; beyond to allow the increase of phenotyping dimensionality degree across tiers. In a first-tier (in 2015-2016 growth season), phenotyping procedures involved measurements of dossel temperatures via thermography imaging in a set of 182 accessions of subspecies Indica, Japonica and Indica/Japonica cross from Embrapa’s Rice Breeding, which were cultivated in two sowing dates. About 30% (55) of the initial genotypes number which showed the lower canopy temperatures were selected based on results of multivariate analyses. In a second-tier (2016-2017 crop season), a second field trial was conducted, using polythene shelters structures aiming ensure the heat stress imposing during the critical phases of plant development; during this period, an effective photochemical quantum yield of photosystem II (YII) performance was monitored across set of genotypes. Data obtained are highlighted and discussed allowing suggest appointments about the usability/bottlenecks of thermography as suitable tool for phenotyping in a large scale manner; beside highlight the importance of some physiological responses as part of the basis of rice heat tolerance. Concluding, the LTB 14031 and BRS Pampa genotypes outperformed the set of evaluated genotypes across sowing dates and years relative to their physiological and grain yield components variables; these genotypes are integrating cross-breeding aiming to construct new plants ideotype which can associate higher grain yield performance when grown under non-stressed conditions and capable to maintain great yield stability under hard environments.

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Section: Introductionmentioning

confidence: 99%

Non-invasive Physiological Approaches for Plant Phenotyping: Rice Responses to Heat Stress

Brito¹,

Moraes²,

Moura³

et al. 2019

JAS

Self Cite

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“…Thus, rice production must be increased by 70% until 2050 to supply the growing demand for food, take into account the growth population and economic development (Godfray et al, 2010). Additionally, there is a consensus that in the future the climate changes will become a bottleneck for crop yield and its stability (Brito et al, 2010(Brito et al, , 2016Diola et al, 2011Diola et al, , 2013Guimarães et al, 2017;Weber et al, 2014). In this way, projected climate changes could reduce crop yields in the future (Fan et al, 2016;Tian et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Non-Structural Carbohydrates Accumulation in Contrasting Rice Genotypes Subjected to High Night Temperatures

Moura¹,

Brito²,

Campos³

et al. 2017

JAS

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Non-structural carbohydrates (NSC) accumulation and photosynthesis traits were studied in two rice (Oryza sativa L.) genotypes maintained under control (22/30 °C -night/day) and at high night temperatures (HNT) (28/30 °C) conditions from heading to milk stage. Rice cultivars were Nagina22 -N22 and BRS Querência -Quer, which are tolerant and sensitive to high temperatures, respectively. The source-sink flow related attributes were tested to understand the nature of NSC accumulation and translocation. Compared to N22, Quer maintained higher stem starch in glucose on seventh day after heading and at milk stage independently of imposed temperatures. However, the levels of starch in glucose were lower for N22 meanwhile their total sugar concentration (TSC) were higher at control and at HNT at milk stage as compared to Quer. N22 maintained unaltered the spikelet sterility and 1000-grain weight across environments showing a consistent trend with its stem NSC translocation. Both genotypes showed similarity in some gas exchange and chlorophyll fluorescence performance suggesting unaffected photosystem II photochemistry, linear electron flux, and CO 2 assimilation. Beyond indicating that source functioning was not the limiting factor for low TSC and starch in glucose levels found in N22 on seventh day after heading stage. Moreover, our data suggest that the higher translocation capacity shown by N22 can be involved in their lower spikelet sterility and 1000-grain weight stability across the environments. These results indicate that selecting genotypes with higher capacity to stem NSC translocation at HNT could lead to more grain yield stability in future climate scenarios.

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“…In this way, add to challenges associated to feed more than nine billions people in the next decades (Fan & Brzeska, 2014;Jacquemin et al, 2013), an additional question is related to how supply the food crescent demand by world growth population in face of increasingly uncertainties about climate stability; which could lead to change of rain regime, besides of increases in frequency of heat and cold waves as predicted to be increasingly common in next decades. In this sense, abiotic and biotic stresses will be the major constraints for agricultural productivity on the global scale and projected climate changes could increase their negative effects in the future (Brito et al, 2010(Brito et al, , 2011(Brito et al, , 2016Diola et al, 2011Diola et al, , 2013Guimarães et al, 2017;Weber et al, 2014). Beyond of the predict impact of these extreme climatic events on global population remain unclear, its occurrence will probably influence the plant species distributions, productivity, carbon balance and negatively impacting on physiological resilience capacity of plants in a specific environment.…”

Section: Introductionmentioning

confidence: 99%

Plasticity in Root Length and Volume Through the Alternate Wetting and Drying Water Management in Rice

Brito¹,

Fagundes²,

Andrés³

et al. 2019

JAS

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Saving water via rational management in paddy rice require efforts to minimize risks to food security, whether consider that its adoption by farmers generally lead to lower grain productivity. Recently, studies by meta-analysis approaches highlight that when soil water potential was higher than -20 kPa, grain yields are not significantly decreased. In this context, new efforts should be done by rice breeders aiming to improve the plant performance when submitted to a more severe alternate wetting and drying (AWD) aiming to face the increasingly extreme climatic events in the next decades. Thus, in this first-tier of the study, our main objective was to evaluate the responses of a genotypes set (cultivars and elite line) for some root traits plasticity and its potential to change gas exchange attributes and grain yield when plants are subjected to severe AWD irrigation management, even when soil water potential beyond this threshold (when soils dried beyond -20 kPa, even reaching -40 kPa). Our data highlight that the mean grain yield across genotypes ranged from 9.25 to 12.65 ton/ha when maintained under continuous flooding (CF) and from 9.52 to 11.67 ton/ha at AWD water management. Root plasticity responses across evaluated genotypes under AWD management were highlighted; BRS Pampa cultivar and Titan CL hybrid showed the greater plasticity index for total root length and total root volume. Data suggests that under severe AWD management, root plasticity in terms of more total root length and total root volume at 0-20 cm depth can leads to some contribution degree for higher grain yield and for its stability under AWD practice. These results can serves as a starting point to additional efforts via physiological breeding approaches aiming the construction of rice plant ideotypes more suitable for AWD management, especially take into account its contributions to mitigate potential impacts of future climate changes on food security.

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Evaluation of water-stress tolerance of Acala SJ 2 and Auburn 2 cotton cultivars in a phenotyping platform

Cited by 9 publications

References 9 publications

Non-invasive Physiological Approaches for Plant Phenotyping: Rice Responses to Heat Stress

Non-invasive Physiological Approaches for Plant Phenotyping: Rice Responses to Heat Stress

Non-Structural Carbohydrates Accumulation in Contrasting Rice Genotypes Subjected to High Night Temperatures

Plasticity in Root Length and Volume Through the Alternate Wetting and Drying Water Management in Rice

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