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Paliwal, S.; Tripathi, M.K.; Tiwari, S.; Tripathi, N.; Payasi, D.K.; Tiwari, P.N.; Singh, K.; Yadav, R.K.; Asati, R.; Chauhan, S. Abiotic Stress. Encyclopedia. Available online: https://encyclopedia.pub/entry/47207 (accessed on 19 June 2024).
Paliwal S, Tripathi MK, Tiwari S, Tripathi N, Payasi DK, Tiwari PN, et al. Abiotic Stress. Encyclopedia. Available at: https://encyclopedia.pub/entry/47207. Accessed June 19, 2024.
Paliwal, Shruti, Manoj Kumar Tripathi, Sushma Tiwari, Niraj Tripathi, Devendra K. Payasi, Prakash N. Tiwari, Kirti Singh, Rakesh Kumar Yadav, Ruchi Asati, Shailja Chauhan. "Abiotic Stress" Encyclopedia, https://encyclopedia.pub/entry/47207 (accessed June 19, 2024).
Paliwal, S., Tripathi, M.K., Tiwari, S., Tripathi, N., Payasi, D.K., Tiwari, P.N., Singh, K., Yadav, R.K., Asati, R., & Chauhan, S. (2023, July 25). Abiotic Stress. In Encyclopedia. https://encyclopedia.pub/entry/47207
Paliwal, Shruti, et al. "Abiotic Stress." Encyclopedia. Web. 25 July, 2023.
Abiotic Stress
Edit

To achieve agricultural sustainability, it is critical to develop and nurture products that are tolerant to rising abiotic pressures caused by climate variability. Numerous abiotic and biotic stressors that constantly threaten plants have an impact on their outputs. Through intricate endogenous signalling networks and numerous modifications, the plant reacts to these stressors. Under these environmental circumstances, the plant’s output and reproductive success are determined by the interactions between these networks. Linseed, like other crops, if subjected to a variety of abiotic stresses, might have reduce yields.

Linum usitatissimum L. biotic and abiotic stresses integrated breeding

1. Abiotic Stress

To achieve agricultural sustainability, it is critical to develop and nurture products that are tolerant to rising abiotic pressures caused by climate variability [1]. Numerous abiotic and biotic stressors that constantly threaten plants have an impact on their outputs. Through intricate endogenous signalling networks and numerous modifications, the plant reacts to these stressors. Under these environmental circumstances, the plant’s output and reproductive success are determined by the interactions between these networks. Linseed, like other crops, if subjected to a variety of abiotic stresses, might have reduce yields [2]. The different abiotic stresses influencing linseed are summarised in the following subsections.

2. Drought Tolerance

Drought is considered one ofthe most pervasive and harmful abiotic factors that impact agricultural output. Drought, on average, affects crop growth, production, and quality by more than 50% [3][4][5][6]. By 2050, nearly fifty percent of land that is usable for agriculture is anticipated to have disastrous effects on plant development [7]. Soil moisture deficiency can have a substantial impact on the flax output capacity, oil quantity and fatty acid arrangement, and fibre quality indicators [8][9][10].
According to Hu and Xiong [11], drought causes normal metabolism to be disrupted by decreased leaf growth, oxidative damage, increased membrane lipid peroxidation, leaf senescence, and abscission. Flax can tolerate drought conditions more effectively than numerous other oil and food crops due to its hardiness [12]; however, flax plants lose a lot of water due to their high transpiration coefficients, which range from 787 to 1093 [13]. To generate optimal yields, fibre flax requires at least 600–650 mm of yearly precipitation, with at least 110–150 mm falling during the vegetative season [14][15]. Since drought is an unpredictable and irregular environmental event, genotypes with high yield potential and drought tolerance may be selected [16].
To overcome these limitations and enhance flax yields, research activities based on conventional breeding and later transgenic approaches were initiated [17]. Understanding the adaptation processes and identifying the underlying genes, markers, and QTLs might help to improve the genetics and production of linseed in semi-arid and arid areas because drought tolerance is a complicated polygenic trait [1]. A limited number of studies have been published identifying the accessions of flax that are resistant to drought [18][19][20] and genome-wide analyses of drought-induced gene expression [15]. Linseed has a shallow root system as compared to other oilseed crops, such as safflower, rapeseed, and sunflower. Therefore, understanding the root system architecture is crucial for improving flax’s ability to absorb water. Many crops, including rice, wheat, and maize, have recently demonstrated the significance of specific root characteristics for efficient water and nutrient absorption under water-stress conditions [21][22][23][24], but knowledge is still somewhat limited in flax. Among different morpho-physiological characteristics, plant height, biomass, seed colour, lignin content, seed yield, leaf absolute water content, and leaf relative water content have been found to be associated with drought tolerance in linseed [25][26].
Plants have many adaptations for surviving in conditions of drought and/or water shortage [27][28]. It is crucial to comprehend these processes in order to create agricultural plants that are resistant to such circumstances [29]. Quéro et al. [30] tried to investigate the processes underlying b-aminobutyric acid (BABA)-induced drought adaptation in plants. BABA causes a reorganisation of the solute content in flax leaves that results in an increased accumulation of proline and nonstructural carbohydrates, as well as a drop in inorganic solutes, according to metabolomic and ionomic profiling of the leaves [2]. In one of the previous studies, it was discovered that BABA therapy caused alterations that made flax plants more resistant to drought stress [30]. Under various irrigation regimes, Ansari et al. [31] investigated the relationship between the crop and mycorrhizal fungi. In a recent study conducted by Liu et al. [32], it was discovered that, in contrast to various plant species, flax mycorrhizal fungus may promote development under both stress and non-stress conditions.
Shivaraj et al. [2] explained the effects of various amounts of titanium dioxide (TiO2) at the nanoscale (10–25 nm) on flax development under stress and non-stress circumstances. It was discovered that TiO2 at modest concentrations facilitated the development of flax in water-scarce environments. Additionally, flax plants treated with nano-TiO2 at a concentration of 100 mg L−1 contained higher seed oil and protein contents. As a result, it has been concluded that the application of nano-TiO2 particles at modest concentrations can reduce the harm caused by drought stress to flax plants as well as increase drought tolerance. Crops that are resistant to duress are developed using both forward and backward genetic methods. In the same setting, the drought-responsive element binding protein 2A (DREB2A) gene was inserted into the plant genome to create a flax cv. Blanka cell line that is drought-tolerant [17].

3. Salinity Tolerance

Numerous variables, such as obscene irrigation, rock weathering, little precipitation, ion exchange, high surface evaporation, and poor cultivation practices, have contributed to the exponential increase in soil salinity in recent years [33][34][35]. According to estimates from Shrivastava and Kumar [36], greater than fifty percent of arable land will be salinised by around 2050. Currently, salty conditions impact around 33% of irrigated land and 20% of all cultivated land. According to Dubey et al. [33], soil salinity–alkalinity in flax causes delayed germination and emergence, reduced seedling survival, erratic crop development, and decreased yield. In a few investigations, flax germplasm was tested for resistance to salinity–alkalinity stressors, and salinity-tolerant lines were found based on biomass, germination, seedling traits, and the K+/Na+ ratio [37][38][39][40][41]. Wu et al. [42] discovered genes in flax that increase the root length, improve membrane damage, and alter the ion distribution to confer salt tolerance. Flax may be cultivated on agricultural terrain where other crops cannot since it can withstand pH levels up to 9.
All agricultural plants face genuine threats from rising soil salinity and alkalinity, among which alkaline-salt stress is more harmful than neutral-salt stress. Considering this, understanding the processes that control plant resistance to saline–alkaline stress has emerged as a hotly debated area of plant science. The impact of these circumstances on the sprouting of the flax plant was examined by Guo et al. [43]. In three experimental circumstances, they discovered that germination decreased with a rise in the ionic concentrations for each of the 10 common flax genotypes they examined. As anticipated, it was discovered that low-concentration treatments with neutral salt and alkaline salt had little impact on germination in all varieties [32].
All varieties of plants responded the most negatively to alkaline-salt stress, and higher concentrations of this treatment completely prevented germination. When five linseed genotypes were developed after being treated with neutral salt and alkaline salt, it was discovered that they had greater salt tolerance [43]. Digital gene expression in flax plants under alkaline-salt stress, neutral-salt stress, and alkaline stress was examined by Yu et al. [44]. In their experiment, it was discovered that under neutral-salt stress, carbohydrate metabolism was impacted, while under alkaline-salt stress, photosynthesis and thereaction to biotic stimuli were badly compromised. In some of the studies, the differential expression of important factors was implicated in responses to abiotic stressors, like WRKY, abscisic acid (ABA), ion channels, and mitogen-activated protein kinase (MAPKK) [2][16]. More of these differentially expressed genes were triggered by alkaline-salt stress than by alkaline stress or neutral-salt stress, indicating that a greater number of genes are involved in regulating the alkaline-salt stress pathway.
Salinity stress has a molecular foundation that is still poorly known. Therefore, Yu et al. [45] used deep sequencing to analyse small RNAs and the degradome in samples that had been exposed to three stress conditions in order to understand the genetic basis of salinity tolerance in flax. Small RNA target genes that control reactions to cues were discovered to be induced. Using transcriptome analysis and degradation genome sequencing, 29 showed opposite expression patterns. The development of climate-smart flax is progressingforall stressors, and 243 miRNA–target combinations have been identified. Two miRNAs, miR398a and miR530, have been reported to be linked to salt stress tolerance in flax. Furthermore, in a separate experiment, Wei et al. [46] discovered that flax seedlings of HIZ019, YOI254, and Tianxin3 had higher salt tolerance because of some important biochemical alterations in flax seedlings under salt stress.

4. Heavy Metal Stress Tolerance

Heavy metal buildup in vegetation is caused by heavy metal contamination of the earth. Heavy metals in the dietary chain are consequently biomagnified. One such heavy metal that can be detrimental to both plants and animals, even in minute quantities, is cadmium. Plants have evolved specialised regulatory mechanisms that allow them to bind metals to compounds like phytochelatins and metallothionein to create complexes (metallothionein group III). Numerous studies have demonstrated that linen clothing tolerates cadmium pollution well. Even though the toxic effect of cadmium restricts its use for both food and medicine, the use of metal-accumulating plants for the phytoremediation of contaminated soils opens a novel and hopeful path towards improving the resilience of their cultivars and variants to Cd stress [2]. Over the past ten years, extensive research has been conducted on the mechanisms that drivecadmium tolerance in plants. High Cd concentrations reduced root development and, to different degrees, increased the generation of membrane permeability, hydrogen peroxide (H2O2), protein oxidation, and lipid peroxides. Additionally, it was discovered that there had been a substantial change in the effectiveness of antioxidant and scavenging enzymes.
The impact of salicylic acid on the antioxidant defence system in flax plants was examined by Belkadhi et al. [47]. Salicylic acid, on the other hand, was discovered to lessen the toxic effects of Cd on the lipid composition of membranes, the antioxidant system, and root development [32]. Belkadhi et al. [48] discovered that a preliminary treatment with salicylic acid preferentially safeguarded plastidial lipids due to greater amounts of polyunsaturated fatty acids in flax. These findings imply that under Cd stress, salicylic acid-pretreated flax plantlets had increased membrane integrity. Salicylic acid boosts root antioxidant mechanisms in flax. Kaplan et al. [49] investigated the effects of cadmium stress on the fatty acid composition of flax in the presence of mycorrhizal fungi. They discovered that seeds from plants cultivated in mycorrhizal fungi contained more unsaturated (18:1, 18:2, and 18:3) fatty acids overall. At 15 ppm of Cd, these impacts became more obvious (the amounts of 18:1, 18:2, and 18:3 were increased by 169, 370, and 150%, respectively). These findings indicate that once the level of Cd in seeds hits a certain level, this heavy metal increases the effectiveness of the enzymes that control the transformation of saturated fatty acids into unsaturated fatty acids.
Although zinc (Zn) is a crucial ingredient needed for the healthy growth and development of plants, too much of it can also be harmful. Significant attempts have been made to comprehend the tolerance of plants to zinc in flax. Grant et al. [50] discovered that flax cultivars are better at transferring Zn through shoots to seeds than Cd. The use of plant species for phytoremediation is determined by the transfer of metal ions to seeds. Plants are also using a variety of biotechnological techniques to limit the absorption or transfer of the metal ions in plant cells. Smykalova et al. [51] investigated how flax varieties could collect and move Ca and Zn in an in vitro culture made from hypocotyl tissues. The flax varieties discovered by Smykalova et al. [51] are those that are tolerant to zinc, and increasing the amount of zinc and decreasing the amount of cadmium in the kernel will be crucial for increasing the nutritional value of linseed.
The toxic effects of heavy metals like copper (Cu), zinc (Zn), cadmium (cd), nickel (Ni), lead (Pb), chromium (Cr), arsenic (As), and cobalt (Co) on seed germination in various varieties of flax have been assessed in another important research conducted by Soudek et al. [52]. Various heavy metals manifested their harmful effects in the following order: As > Cu > Cd > Co > Cr > Ni > Pb > Zn. In fact, a lot of these studies point to the effective use of flax’s potential for phytoremediation, especially when cultivated for fibre production. The growing of flax on heavy-metal-contaminated soils may be made easier with a thorough grasp of the mechanisms underlying heavy metal tolerance [2].

5. Cold Stress Tolerance

Many cool-season perennial crops’ outputs are influenced by two significant physiological processes: vernalisation and photoperiodism. Darapuneni et al. [53] examined the flowering response of various flax genotypes under two photoperiod and vernalisation conditions in growth chamber research. The findings imply that the photoperiod, vernalisation, and genetics significantly influence early blooming in flax. For frigid climate regions like the Upper Midwest of the US and Canada, the early-blooming trait is more important. However, owing to the hot spring and summer temperatures in some places, such as Texas, flax is produced in the autumn. Flax varieties demonstrated genotypic interactions with the photoperiod and vernalisation.
In particular, Texas flax genotypes of the winter variety were susceptible to both vernalisation and blooming photoperiods. The flowering times of most other spring-grown flax genotypes were unchanged by the vernalisation treatments, whereas Texas genotypes postponed anthesis for 7 days or longer in unvernalised seedlings [16]. The majority of other genotypes were unaffected by circadian rhythms (photoperiodism)in vernalised seedlings, while Texas cultivars delayed anthesis for a period of twelve days or longer under vernalised and short-day conditions. Screening for vernalisation and photoperiodic sensitivity in Texas genotypes, as well as the introgression of these characteristics into newly adopted spring-grown genotypes, is required for the development of high-yielding flax genotypes for production sites in the southern Great Plains [2].

6. Heat Tolerance

Particularly in tropical and subtropical climates, heat stress negatively impacts physiological processes, development (Figure 1), growth, and yield [54]. According to several studies [55][56][57][58], a prolonged duration of heat stress (40 °C for 5–7 days) in relation to flowering duration may have a substantial effect on flax’s boll development, pollen viability, pollen production, flowering, seed oil quality, quantity, and seed set. Flax fibre does not need high temperatures. Flax grows best and produces the highest-quality fibre under circumstances that are damp, overcast, and moderately chilly (18–20 °C). High temperatures, especially terminal heat, which is limiting for flax growth, cause poor adaptation of superior fibre linseed genotypes to hotter climates. Although there have not been many studies on how higher temperatures affect flax development, physiological processes, and yields [58][59], the molecular dissection is also unclear.
Figure 1. Schematic representation of abiotic stress regulation mechanisms by plants. The orange boxes represent coping mechanisms, while grey boxes represent disturbances in plant physiological response.

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