Physiological impacts of ABA–JA interactions under water-limitation

Abstract

Plant responses to drought stress depend on highly regulated signal transduction pathways with multiple interactions. This complex crosstalk can lead to a physiological outcome of drought avoidance or tolerance/resistance. ABA is the principal mediator of these responses due to the regulation of stomatal closure that determines plant growth and survival, but also other strategies of drought resistance such as osmotic adjustment. However, other hormones such as JA seem responsible for regulating a subset of plant responses to drought by regulating ABA biosynthesis and accumulation and ABA-dependent signalling, but also by ABA independent pathways. Here, we review recent reports of ABA–JA hormonal and molecular interactions within a physiological framework of drought tolerance. Understanding the physiological significance of this complex regulation offers opportunities to find strategies of drought tolerance that avoid unwanted side effects that limit growth and yield, and may allow biotechnological crop improvement.

Gas Exchange and Photochemical Efficiency in Lima Bean Genotypes Grown in Compacted Soils

“…An example is the reduction in the hydraulic conductivity of the bean root in response to saline stress (CALVO-POLANCO; SÁNCHEZ-ROMERA; AROCA, 2014). According to Ollas and Dodd (2016), changes in root hydraulic conductivity may affect the water status of the plant to control transpiration. The maximum rates of E was 5.45 and 1.24 g cm -3 , respectively.…”

Enhanced tolerance to a combination of heat stress and drought in Arabidopsis plants deficient in ICS1 is associated with modulation of photosynthetic reaction center proteins

“…The involvement of plant hormones in the acclimation of plants to abiotic stress has been extensively studied. For example, abscisic acid (ABA) plays key roles in the response of plants to drought by regulating stomatal closure and expression of acclimation proteins (Nakashima et al 2014, Mittler and Blumwald 2015, de Ollas and Dodd 2016, Vishwakarma et al 2017, Wang et al 2017). It has long been known that ABA functions as a key regulator of stomatal closure to prevent excess water loss through respiration under drought (Daszkowska-Golec and Szarejko 2013).…”

Drought-stressed tomato plants trigger bottom-up effects on key mite pests

“…In the case of tomato, ABA has been involved in different drought tolerance mechanisms such as stomatal closure, growth reduction, metabolism reconfiguration and the increase of free sugars and amino acids (Thompson et al, 2007;Asbahi et al, 2012;Iovieno et al, 2016). Nevertheless, SA and JA, the two main regulators of biotic stress responses, have been also reported to be involved in the plant response to drought (Daszkowska-Golec and Szarejko, 2013;Bartels and Sunkar 2005;De Ollas and Dodd, 2016). Jasmonates play an important role in the plant response to drought, interacting at different levels with the ABA signaling pathway on tomato plants (Muñoz-Espinosa et al, 2015;De Ollas and Dodd, 2016).…”

“…Nevertheless, SA and JA, the two main regulators of biotic stress responses, have been also reported to be involved in the plant response to drought (Daszkowska-Golec and Szarejko, 2013;Bartels and Sunkar 2005;De Ollas and Dodd, 2016). Jasmonates play an important role in the plant response to drought, interacting at different levels with the ABA signaling pathway on tomato plants (Muñoz-Espinosa et al, 2015;De Ollas and Dodd, 2016). In contrast, the role SA on plant response to drought is not clearly understood, in tomato is reported to increase drought tolerance and is involved on early signaling (Hayat et al, 2008;Muñoz-Espinosa et al, 2015).…”

“…Jasmonates play an important role in the plant response to drought, interacting at different levels with the ABA signaling pathway on tomato plants (Muñoz-Espinosa et al, 2015;De Ollas and Dodd, 2016). In contrast, the role SA on plant response to drought is not clearly understood, in tomato is reported to increase drought tolerance and is involved on early signaling (Hayat et al, 2008; Muñoz-Espinosa et al, 2015).…”