Phenotypic and metabolic variation among spring Brassica napus genotypes during heat stress

Koscielny, C. B.; Hazebroek, Jan; Duncan, Robert

doi:10.1071/cp17259

Cited by 30 publications

(29 citation statements)

References 63 publications

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“…Temperature stress can often accompany drought stress and has an impact on the fluidity of plant membranes (Sangwan et al, 2002), plant metabolism (Koscielny et al, 2018), ROS activation (Kotak et al, 2007), and protein misfolding (Scharf et al, 2012). Under colder temperatures, root nodulation is decreased in beans, lentils, and peas (Junior et al, 2005), and many organisms that live in the nodules have lower survivability (Singh et al, 2012).…”

Section: Abiotic Plant Stress and The Impact On Microbial Communitiesmentioning

confidence: 99%

Plant Host-Associated Mechanisms for Microbial Selection

et al. 2019

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Plants serve as host to numerous microorganisms. The members of these microbial communities interact among each other and with the plant, and there is increasing evidence to suggest that the microbial community may promote plant growth, improve drought tolerance, facilitate pathogen defense and even assist in environmental remediation. Therefore, it is important to better understand the mechanisms that influence the composition and structure of microbial communities, and what role the host may play in the recruitment and control of its microbiome. In particular, there is a growing body of research to suggest that plant defense systems not only provide a layer of protection against pathogens but may also actively manage the composition of the overall microbiome. In this review, we provide an overview of the current research into mechanisms employed by the plant host to select for and control its microbiome. We specifically review recent research that expands upon the role of keystone microbial species, phytohormones, and abiotic stress, and in how they relate to plant driven dynamic microbial structuring.

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Section: Abiotic Plant Stress and The Impact On Microbial Communitiesmentioning

confidence: 99%

Plant Host-Associated Mechanisms for Microbial Selection

et al. 2019

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“…Heat susceptibility index (HSI) values for important traits, such as grain yield have been widely used for selecting tolerant genotypes in spring canola (Koscielny, Hazebroek, & Duncan, 2018), wheat (Bhardwaj, Sharma, Singh, & Sharma, 2017) and barley (Parashar, Gothwal, & Singh, 2019). In the present study, HSI was calculated as a measure of HNT tolerance for dry matter accumulation, yield and yield components and oil concentration with high night temperature stress and control by using the formula as suggested by Fischer & Maurer (1978).…”

Section: Heat Susceptibility Indexmentioning

confidence: 99%

High night‐time temperature during flowering and pod filling affects flower opening, yield and seed fatty acid composition in canola

Pokharel

Chiluwal

Stamm

et al. 2020

J Agronomy Crop Science

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Winter canola (Brassica napus L.) is highly sensitive to increasing temperatures during the reproductive and pod‐filling stages. Although the impact of high day‐time temperature stress on yield and quality has been documented in canola, similar information under high night‐time temperature (HNT) stress is not available. Using six hybrids and four open‐pollinated cultivars, we observed a marked shift in peak flowering towards earlier, cooler hours of the morning under HNT. Averaged across two independent experiments, the photochemical efficiency of photosystem II was significantly decreased (3%), with a significant increase in thylakoid membrane damage (13%) in the leaves of susceptible cultivars under HNT stress. Similarly, the susceptible cultivars also recorded significant reduction in biomass (34%), pod number (22%), pod weight (37%) and total seed weight (40%) per plant while the same set of agronomic traits were not affected among the tolerant cultivars. Quantitative impact of heat stress was confirmed with increased sensitivity to HNT exposure from gametogenesis until maturity resulting in a significantly higher yield loss compared to stress exposure from post‐flowering till maturity. HNT significantly decreased oil concentration, but increased protein concentration and saturated fatty acid levels in seeds of the susceptible cultivars. However, HNT had no impact on the unsaturated fatty acids in both hybrids and the open‐pollinated cultivars. Breeding targets based on fatty acid composition for enhancing canola seed quality may not be easily amenable due to the inconsistency documented with the compositional changes under heat stress. In summary, our findings conclude that canola hybrids are better suited to regions experiencing heat stress, compared to open‐pollinated cultivars, indicating the possibility of a complete shift to hybrid canola cultivation under predicted hotter climates in the future.

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“…Variability in thermal tolerance has been observed among different genotypes (e.g. Rainey and Griffiths, 2005; Koscielny et al, 2018) and life stages (Wahid et al, 2007; Zhou et al, 2017), as well as within plant organs (e.g. leaves; Yamada et al, 1996; Kalituho et al, 2003; Zhang et al, 2012; Marias et al, 2017a; Marias et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Differential Leaf Age-Dependent Thermal Plasticity in the Keystone Seagrass Posidonia oceanica

et al. 2019

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Introduction: Gene-expression patterns and their upstream regulatory mechanisms (e.g. epigenetic) are known to modulate plant acclimatability and thus tolerance to heat stress. Within species, thermal plasticity (i.e. temperature-sensitive phenotypic plasticity) and differential thermo-tolerance are recognized among different genotypes, development stages, organs or tissues. Leaf age and lifespan have been demonstrated to strongly affect photosynthetic thermo-tolerance in terrestrial species, whereas there is no information available for marine plants. Materials and Methods: Here, we investigated how an intense warming event affects molecular and photo-physiological functions in the large-sized seagrass Posidonia oceanica, at fine spatial resolution. Plants were exposed for one week at 34°C in a controlled-mesocosm system. Subsequent variations in the expression of 12 target genes and global DNA methylation level were evaluated in three leaf-age sections (i.e. basal, medium and high) established along the longitudinal axis of youngest, young and fully mature leaves of the shoot. Targeted genes were involved in photosynthesis, chlorophyll biosynthesis, energy dissipation mechanisms, stress response and programmed cell death. Molecular analyses paralleled the assessment of pigment content and photosynthetic performance of the same leaf segments, as well as of plant growth inhibition under acute warming. Results: Our data revealed, for the first time, the presence of variable leaf age-dependent stress-induced epigenetic and gene-expression changes in seagrasses, underlying photo-physiological and growth responses to heat stress. An investment in protective responses and growth arrest was observed in immature tissues; while mature leaf sections displayed a higher ability to offset gene down-regulation, possibly through the involvement of DNA methylation changes, although heat-induced damages were visible at photo-physiological level. Discussion: Overall, mature and young leaf tissues exhibited different strategies to withstand heat stress and thus a variable thermal plasticity. This should be taken in consideration when addressing seagrass response to warming and other stressors, especially in large-sized species, where sharp age differences are present within and among leaves, and other gradients of environmental factors (e.g. light) could be at play. Molecular and physiological evaluations conducted only on adult leaf tissues, as common practice in seagrass research, could give inadequate estimates of the overall plant state, and should not be considered as a proxy for the whole shoot.

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Phenotypic and metabolic variation among spring Brassica napus genotypes during heat stress

Cited by 30 publications

References 63 publications

Plant Host-Associated Mechanisms for Microbial Selection

Plant Host-Associated Mechanisms for Microbial Selection

High night‐time temperature during flowering and pod filling affects flower opening, yield and seed fatty acid composition in canola

Differential Leaf Age-Dependent Thermal Plasticity in the Keystone Seagrass Posidonia oceanica

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