Carbohydrate Dynamics in Leaves of Rapeseed (Brassica napus) Under Drought

Abstract

Until now, the carbohydrate dynamics in leaves of rapeseed under drought have largely been unknown. For this reason, a growth chamber study was conducted to examine whether the accumulation of carbohydrates under drought stress contributes to osmotic adjustment in leaf tissue. Plants of the cultivar Titan were subjected to temporary drought in the vegetative and reproductive stages. A third variant of long-term drought covered the period from leaf development to flowering. The level of sucrose decreased under moderate water deficit, but accumulated under severe long-term drought. Concentrations of glucose, fructose and trehalose were significantly enhanced and that of raffinose decreased in all the variants of drought. There was no evidence that any of the carbohydrates analysed in this study or the activities of soluble acid and cell wall invertases contributed to a drought-induced accumulation of osmolytes. The results of this study indicate that osmotic adjustment in response to drought in leaves of the rapeseed cultivar Titan is only limited. It is virtually impossible that carbohydrates function as osmoprotectants in leaves of this cultivar, rising above that of the frequently detected accumulation of proline in rapeseed under water deficit.

Use of MSAP Markers to Analyse the Effects of Salt Stress on DNA Methylation in Rapeseed (Brassica napus var. oleifera)

“…As far as the salt-tolerant cultivar Exagone is concerned, our data demonstrates that salinity indeed significantly increased the endogenous trehalose content in the leaves. Müller et al [66] recently reported such an increase in response to drought in rapeseed cultivar Titan. Since salt stress clearly presents an osmotic component compromising the plant water status [8,9], the reported increase in response to salt may be at least partly due to salt-induced modification in the plant water potential.…”

Physiological characteristics, antioxidant enzyme activities, and gene expression in 2 spring canola (Brassica napus L.) cultivars under drought stress conditions

“…These compounds are osmoprotectant for cell protection from the harmful effects of stress. Muller et al (2012) showed the level of sucrose decreased under moderate water deficit, but concentrations of glucose, fructose, and trehalose were significantly enhanced and that of raffinose decreased in all variants of drought. 3.5.…”

Growth‐Stage‐Based Irrigation Management on Biomass, Yield, and Yield Attributes of Spring Canola in the Southern Great Plains

“…Therefore, there is a need to identify alternative crops that have lower ET requirements than traditional crops and are well adapted to the region. Canola regulates carbohydrate dynamics and accumulates various metabolites including proline in drought to enhance its drought stress tolerance (Ma et al, 2004;Din et al, 2011;Müller et al, 2012). Therefore, understanding the critical growth stage of alternative crop for irrigation will help in developing proper irrigation strategies to maximize return per unit of water (Singh et al, 2016b).…”

“…It reduces stomatal conductance and promotes stomatal closure to preserve plant hydration on reduction in leaf water status ( Johnston et al, 2002;Shafiq et al, 2014). Canola regulates carbohydrate dynamics and accumulates various metabolites including proline in drought to enhance its drought stress tolerance (Ma et al, 2004;Din et al, 2011;Müller et al, 2012). Therefore, canola could be a good alternative crop for the region.…”