Antioxidant and Hormone Responses to Heat Stress in Two Kentucky Bluegrass Cultivars Contrasting in Heat Tolerance

Li, Feifei; Zhan, Da; Xu, Lixin; Han, Liebao; Zhang, Xunzhong

doi:10.21273/jashs.139.5.587

Cited by 24 publications

(16 citation statements)

References 35 publications

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“…The membrane constituents, including proteins, fatty acids and sterols changed significantly under heat stress conditions [132,133]. Similar results were observed in Kentucky bluegrass, where antioxidant enzyme activities and hormonal contents changed with duration of heat stress [134]. Consequentially, morphological alterations such as growth inhibition, TQ decline and leaf senescence were derived from the physiological changes.…”

Section: Heat Stresssupporting

confidence: 75%

Mechanisms of Environmental Stress Tolerance in Turfgrass

et al. 2020

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Turfgrasses constitute a vital part of the landscape ecological systems for sports fields, golf courses, home lawns and parks. However, turfgrass species are affected by numerous abiotic stresses include salinity, heat, cold, drought, waterlogging and heavy metals and biotic stresses such as diseases and pests. Harsh environmental conditions may result in growth inhibition, damage in cell structure and metabolic dysfunction. Hence, to survive the capricious environment, turfgrass species have evolved various adaptive strategies. For example, they can expel phytotoxic matters; increase activities of stress response related enzymes and regulate expression of the genes. Simultaneously, some phytohormones and signal molecules can be exploited to improve the stress tolerance in turfgrass. Generally, the mechanisms of the adaptive strategies are integrated but not necessarily the same. Recently, metabolomic, proteomic and transcriptomic analyses have revealed plenty of stress response related metabolites, proteins and genes in turfgrass. Therefore, the regulation mechanism of turfgrass’s response to abiotic and biotic stresses was further understood. However, the specific or broad-spectrum related genes that may improve stress tolerance remain to be further identified. Understanding stress response in turfgrass species will contribute to improve stress tolerance of turfgrass.

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Section: Heat Stresssupporting

confidence: 75%

Mechanisms of Environmental Stress Tolerance in Turfgrass

et al. 2020

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“…Thus, our findings in this regard in contrasting lentil genotypes are in agreement with observations in some other crop species, including brassica (Wilson et al, 2014 ), Kentucky bluegrass ( Poa pratensis L .) (Li et al, 2014 ), and chickpea (Kaushal et al, 2013 ). Though, there were variations in oxidative defense in neutralizing hydrogen peroxide in some genotypes, considering the higher expression of components of ascorbate/glutathione pathway in HT genotypes, the heat tolerance in the present study might be partly related to this pathway.…”

Section: Discussionmentioning

confidence: 99%

Identification of High-Temperature Tolerant Lentil (Lens culinaris Medik.) Genotypes through Leaf and Pollen Traits

et al. 2017

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Rising temperatures are proving detrimental for various agricultural crops. Cool-season legumes such as lentil (Lens culunaris Medik.) are sensitive to even small increases in temperature during the reproductive stage, hence the need to explore the available germplasm for heat tolerance as well as its underlying mechanisms. In the present study, a set of 38 core lentil accessions were screened for heat stress tolerance by sowing 2 months later (first week of January; max/min temperature >32/20°C during the reproductive stage) than the recommended date of sowing (first week of November; max/min temperature <32/20°C during the reproductive stage). Screening revealed some promising heat-tolerant genotypes (IG2507, IG3263, IG3297, IG3312, IG3327, IG3546, IG3330, IG3745, IG4258, and FLIP2009) which can be used in a breeding program. Five heat-tolerant (HT) genotypes (IG2507, IG3263, IG3745, IG4258, and FLIP2009) and five heat-sensitive (HS) genotypes (IG2821, IG2849, IG4242, IG3973, IG3964) were selected from the screened germplasm and subjected to further analysis by growing them the following year under similar conditions to probe the mechanisms associated with heat tolerance. Comparative studies on reproductive function revealed significantly higher pollen germination, pollen viability, stigmatic function, ovular viability, pollen tube growth through the style, and pod set in HT genotypes under heat stress. Nodulation was remarkably higher (1.8–22-fold) in HT genotypes. Moreover, HT genotypes produced more sucrose in their leaves (65–73%) and anthers (35–78%) that HS genotypes, which was associated with superior reproductive function and nodulation. Exogenous supplementation of sucrose to in vitro-grown pollen grains, collected from heat-stressed plants, enhanced their germination ability. Assessment of the leaves of HT genotypes suggested significantly less damage to membranes (1.3–1.4-fold), photosynthetic function (1.14–1.17-fold) and cellular oxidizing ability (1.1–1.5-fold) than HS genotypes, which was linked to higher relative leaf water content (RLWC) and stomatal conductance (gS). Consequently, HT genotypes had less oxidative damage (measured as malondialdehyde and hydrogen peroxide concentration), coupled with a higher expression of antioxidants, especially those of the ascorbate–glutathione pathway. Controlled environment studies on contrasting genotypes further supported the impact of heat stress and differentiated the response of HT and HS genotypes to varying temperatures. Our studies indicated that temperatures >35/25°C were highly detrimental for growth and yield in lentil. While HT genotypes tolerated temperatures up to 40/30°C by producing fewer pods, the HS genotypes failed to do so even at 38/28°C. The findings attributed heat tolerance to superior pollen function and higher expression of leaf antioxidants.

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“…Accordingly, He and Huang () reported in Kentucky bluegrass that higher activities of superoxide dismutase and ascorbate peroxidase, for singlet oxygen and hydrogen peroxide scavenging, respectively, were associated with increased heat tolerance. Similarly, Li, Zhan, Xu, and Zhang () and Du, Zhou, and Huang () observed that the thermotolerant cultivar of Kentucky bluegrass in their studies had higher activities of superoxide dismutase, ascorbate peroxidase, peroxidase, and catalase compared with that found in the heat‐sensitive cultivar for the duration of the stress. Higher activities of superoxide dismutase and catalase were also recorded in a heat‐tolerant creeping bentgrass cultivar compared to one that was heat‐sensitive (Huang, Liu, & Xu, ; Liu & Huang, ; Wang et al., ).…”

Section: Effects Of Heat Stress On Cool‐season Grass Metabolismmentioning

confidence: 81%

“…Furthermore, hormonal metabolism of cool‐season grasses has not received great attention even though hormones play a pivotal role in regulating plant responses to abiotic stresses. The number of studies on hormonal metabolism of grasses under stress conditions is extremely limited and addresses mainly heat and drought stress (Alam et al., ; Krishnan & Merewitz, ; Li et al., ; Ma, Xu, Meyer, & Huang, ; Man, Bao, & Han, ). The small number of studies in this subject is understandable due to the highly complex nature of hormonal crosstalk in plants.…”

Section: Conclusion and Future Researchmentioning

confidence: 99%

Impacts of abiotic stresses on the physiology and metabolism of cool‐season grasses: A review

Loka

Harper

Humphreys

et al. 2018

Food and Energy Security

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Grasslands cover more than 70% of the world's agricultural land playing a pivotal role in global food security, economy, and ecology due to their flexibility and functionality. Climate change, characterized by changes in temperature and precipitation patterns, and by increased levels of greenhouse gases in the atmosphere, is anticipated to increase both the frequency and severity of extreme weather events, such as drought, heat waves, and flooding. Potentially, climate change could severely compromise future forage crop production and should be considered a direct threat to food security. This review aimed to summarize our current understanding of the physiological and metabolic responses of temperate grasses to those abiotic stresses associated with climate change. Primarily, substantial decreases in photosynthetic rates of cool‐season grasses occur as a result of high temperatures, water‐deficit or water‐excess, and elevated ozone, but not CO2 concentrations. Those decreases are usually attributed to stomatal and non‐stomatal limitations. Additionally, while membrane instability and reactive oxygen species production was a common feature of the abiotic stress response, total antioxidant capacity showed a stress‐specific response. Furthermore, climate change‐related stresses altered carbohydrate partitioning, with implications for biomass production. While water‐deficit stress, increased CO2, and ozone concentrations resulted in higher carbohydrate content, the opposite occurred under conditions of heat stress and flooding. The extent of damage is greatly dependent on location, as well as the type and intensity of stress. Fortunately, temperate forage grass species are highly heterogeneous. Consequently, through intra‐ and in particular inter‐specific plant hybridization (e.g., Festuca x Lolium hybrids) new opportunities are available to harness, within single genotypes, gene combinations capable of combating climate change.

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Antioxidant and Hormone Responses to Heat Stress in Two Kentucky Bluegrass Cultivars Contrasting in Heat Tolerance

Cited by 24 publications

References 35 publications

Mechanisms of Environmental Stress Tolerance in Turfgrass

Mechanisms of Environmental Stress Tolerance in Turfgrass

Identification of High-Temperature Tolerant Lentil (Lens culinaris Medik.) Genotypes through Leaf and Pollen Traits

Impacts of abiotic stresses on the physiology and metabolism of cool‐season grasses: A review

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