CaCl2 treatment improves drought stress tolerance in barley (Hordeum vulgare L.)

Abstract

Spring drought can adversely affect the productivity of barley (Hordeum vulgare L.) by reducing the yield. Because seed osmopriming can enhance crop productivity, we examined the potential of CaCl 2 treatment to improve drought tolerance in spring barley. Initially, we applied the priming procedure (5, 50, and 500 mM) to caryopses and assessed its effectiveness using a routine germination test, followed by measuring the level of divalent cations. Since drought adaptation is a complex phenomenon, we tested a comprehensive set of physiological parameters including (1) relative water content (RWC), (2) gas exchange parameters, and (3) photosynthetic pigments concentration in leaves of 3-week-old plants developed from the seeds subjected to osmopriming, followed by exposure to increasing water shortage. The plants were sampled at two selected time points, determined by soil moisture retention (pF = 3.6 and 4.2). The effect of CaCl 2 pretreatment was characterized in three distinct spring barley varieties, which differed in their response to drought stress (drought-tolerant Sebastian and Cam/B1/C1 and drought-susceptible Georgie), to assess potential interactions between osmopriming and genetically determined drought tolerance. Our results clearly demonstrate that CaCl 2 priming improves drought tolerance in stress-tolerant as well as drought-susceptible barley cultivars. Furthermore, we show that the beneficial effects of calcium preconditioning interact significantly with genetically determined drought tolerance.

Melatonin confers drought stress tolerance in soybean (Glycine max L.) by modulating photosynthesis, osmolytes, and reactive oxygen metabolism

“…In our study, melatonin treatment significantly increased PN and E in soybean leaves when compared to the corresponding levels in drought-stressed leaves. Soluble sugar, proline, and soluble protein, the most common compatible osmolytes, are actively accumulated to maintain a higher water potential and cell turgor under drought stress, which is the first line of defense against drought (Du et al 2004, Kaczmarek et al 2017. Osmolytes are synthesized in response to drought stress and do not interfere with the normal cellular biochemical reactions (Du et al 2004).…”

“…Drought is an abiotic stress that has drastic effect on the growth and development of plants, especially at the seedling stage, which affects the global grain production (Du et al 2004, Basu et al 2010, Deng et al 2012, Hu et al 2013, Kaczmarek et al 2017. In spring, drought can kill seedlings through their root systems, which are not fully developed (Kaczmarek et al 2017). With the rising global temperature, the timing and magnitude of drought stress has been increasing yearly, especially, in arid and semiarid regions (Wang et al 2013, Harrison et al 2014.…”

“…Many studies have reported that when plants encounter a water deficit, there is a disturbance in water balance, and a decline in photosynthesis (Fu and Huang 2001, Hu et al 2013, Cui et al 2017. Kaczmarek et al (2017) proposed that osmolyte accumulation was the first line of defense against drought. The most common compatible osmolytes, such as soluble sugars, soluble proteins, and proline, can reduce membrane permeability, and play an important role in maintaining water balance in plants under mild water stress (Du et al 2004).…”

Biostimulant Effects of Glutacetine® and Its Derived Formulations Mixed With N Fertilizer on Post-heading N Uptake and Remobilization, Seed Yield, and Grain Quality in Winter Wheat

“…Moreover, it is well documented that the actions of N and S fertilizers are strongly linked and impact seed yield components and quality (Poisson et al, 2019;Guerrini et al, 2020). Other elements, such as Ca (Liu et al, 2020), chloride (Cl), or boron (B), facilitate N assimilation (López-Lefebre et al, 2000;Bielski et al, 2020) and stimulate N metabolism (Wang et al, 2019a) even under abiotic stresses (Arshi et al, 2006;Das et al, 2016;Kaczmarek et al, 2016). Designing and developing new biostimulants or enhanced-efficiency fertilizers is a crucial process that requires an accurate testing of the product's effects on the morphophysiological traits of plants and a deep understanding of their mechanism of action.…”

PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERIZATION OF TEA (Camellia sinensis L.) MICROSHOOTS in vitro: THE NORM, OSMOTIC STRESS, AND EFFECTS OF CALCIUM

“…Имеются сообщения, что Са 2+ участвует в регуляции реакции растений на неблагоприятное действие засухи (35). У проростков Vernicia fordii Hemsley и Hordeum vulgare L. после обработки этим макроэлементом содержание воды в листьях повышалось, и этот эффект зависел от длительности воздействия и концентрации Са 2+ , а также от генотипа растения (36,37 Стрессовые условия, в том числе засуха, часто способствуют образованию активных форм кислорода в клетках растений и усилению окислительных процессов (1, 4, 19,35). Для их оценки определяют показатели ПОЛ в клетках, о котором судят по количеству МДА (19,38).…”