Water relations and some aspects of leaf metabolism of Jatropha curcas young plants under two water deficit levels and recovery

Abstract

Water relations and some aspects of leaf metabolism of Jatropha curcas young plants under two water deficit levels and recovery and 25% (severe stress), after rehydration were measured on the second and fourth day. Both mild and severe stress decreased g s and E; however, only severe stress reduced LCS, FAA and TP content and increased SOD activity (70%) and MDA content (60%) compared with the control. Moreover, under these conditions, the plants showed severe leaf senescence. These results show that only severe drought stress decrease foliar metabolism in potted plants.These results show that severe drought decreased metabolism and leaf RWC, in potted plants. However, 48 h under a moderate stress is enough to drive the stomatal control is the main barrier against water loss. Finally, in the fourth day after rehydration the plants under a moderate and severe drought even had a g s and E reduced in both evaluation periods.Key words: biodiesel, drought tolerance, MDA, oxidative stress, ROS, water deficit.

Gas exchange and photosynthetic activity in Hancornia speciosa gomes seedlings under water deficit conditions and during rehydration

“…Although leaf Ψw was not evaluated, there are reports in the scientific literature showing that controlling stomatal opening in water-deficient plants seems to be an immediate response to low water availability in the soil (ARCOVERDE et al, 2011;POMPELLI et al, 2010;SILVA et al, 2010;FLEXAS et al, 2006) even before a decrease in the relative leaf water content is noted.…”

“…In their review of the literature, Sapeda et al (2013), found a strong evidence that gs responds to soil moisture content more than leaf turgor; therefore, reduced stomatal conductance under water stress conditions may be unrelated to reduced leaf moisture content (POMPELLI et al, 2010;SILVA et al, 2010;ARCOVERDE et al, 2011), but it may be related to other factors such as the plant hormone abscisic acid (ABA) (WILKNSON; DAVIES, 2002) which originates from the roots and functions to minimize water loss due to transpiration.…”

The relationship between succulence and shoot biomass differences according to nutritional status in Jatropha curcas L.

“…Nevertheless, in the case of J. curcas, this strategy still needs experimental verification. Succulence is a plant characteristic with clear ecophysiological implications (Mantovani, 1999;Mwine and Van Damme, 2011), which in J. curcas plants, until now, has been mainly explored in in relation to its adaptation to environments characterized by water deficit or soil salinity (Maes et al, 2009;Arcoverde et al, 2011;Díaz-López et al, 2012;Rodrigues et al, 2013;Sapeta et al, 2013).…”

Antioxidant system is insufficient to prevent cell damages in Euterpe oleracea exposed to water deficit

“…He et al (2012) described highest H 2 O 2 accumulation in leaf, following by stem and root in Solanum tuberosum plants exposed to water limitation. The increase in MDA in both tissues was caused by the actions of reactive oxygen species (ROS), such as H 2 O 2 and O 2 -, which areproduced during stress (Arcoverde et al, 2011). ROS also promote lipid peroxidation due to membrane denaturation and consequent increases in MDA levels.…”