Changes in Salicylic and Abscisic Acid Contents during Heat Treatment and Their Effect on Thermotolerance of Grape Plants

Abstract

Heat treatment (38 ° C) of young grape plants ( Vitis vinifera L., cv. Jingxiu) or leaf spraying with 100 µ M salicylic acid (SA) increased leaf thermotolerance. Both treatments led to an increase in ABA content and a decrease in lipoxygenase (LOX) activity. ABA content showed a drastic rise by one hour after treatments and then sharply declined while LOX activity continuously decreased. In the course of heat treatment of grape plants, endogenous SA level and phenylalanine ammonia-lyase activity rapidly increased during the first hour, then declined. These results showed that endogenous SA and ABA can be involved in grape plant response to heat treatment resulted in improved thermotolerance.

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

“…), and pea (Musatenko et al, 2003;Shakirova et al, 1995;Veselov et al, 1998). Wang et al (2005) found ABA content significantly increased in grape within 1 h after high-temperature stress. The higher ABA content in 'EverGlade' relative to 'Kenblue' under heat stress suggested that ABA level may be associated with heat tolerance in kentucky bluegrass.…”

“…Plants have developed various systems to cope heat stress such as antioxidant defense system, hormonal regulation, saturation level of cell membrane lipid, and fatty acids (DiPaola and Beard, 1992;Fry and Huang, 2004). Antioxidants and hormones are some of the most important metabolic defense against heat stress (Upchurch, 2008;Wang et al, 2005;Wang and Huang, 2004).…”

Interplay Between Environmental Signals and Endogenous Salicylic Acid Concentration

“…However, as occurred with grape plants, the initial and substantial increase in endogenous SA following the administration of short-term heat stress diminishes over time. Thus, after 24 h the endogenous SA levels in control and heat-stressed plants were essentially the same (Wang et al 2004(Wang et al , 2005. Interestingly, it appears that the source of this increased SA in heat-stressed grape stem and leaf tissue is the roots, as progressive increases in labelled SA transported in xylem from the roots to the shoot occurred coincidentally with the time of the heat treatment (Liu et al 2008).…”

“…Also, endogenous ABA levels are reported to increase in plants grown at low temperatures (Assmann 2010). Young grape leaves subjected to short-term heat stress showed rapid increases in endogenous SA and ABA accumulation during the first hour, with a rapid decline over the next 24 h (Wang et al 2005). Pre-treatment of the grape plants with exogenous SA caused the same increase (in terms of both absolute levels and trend over time) of endogenous ABA (Wang et al 2005).…”

“…Young grape leaves subjected to short-term heat stress showed rapid increases in endogenous SA and ABA accumulation during the first hour, with a rapid decline over the next 24 h (Wang et al 2005). Pre-treatment of the grape plants with exogenous SA caused the same increase (in terms of both absolute levels and trend over time) of endogenous ABA (Wang et al 2005). In a similar manner, heat-stressed young pea leaves showed rapid increases in endogenous SA and ABA (with a peak occurring at about the 25 min mark).…”