Rehydration of Sugar Beet Plants after Water Stress: Effect of Cytokinins

Methyl jasmonate alleviates drought stress in young sugar beet (Beta vulgaris L.) plants

“…Fv/Fm declined only after 6 days without water and was reduced by a mere 2% relative to controls at this time. Other studies conducted with more mature plants have similarly reported sugar beet Fv/Fm to be unaffected by drought stress (Clover et al, 1999;Vom a cka & Posp ı silov a, 2003) or affected only under severe drought conditions (Bloch et al, 2006).…”

Photosynthesis on individual leaves of sugar beet (Beta vulgaris) during the ontogeny at variable water regimes

“…So far, major efforts have been addressed at studying photosynthesis at a single‐leaf level (Yeo et al , 1985; Willmer et al 1988; Monti et al , 2006 b ), while just a few reports have been focused on P n of sequential leaves in response to water stress or rehydration (Vomáčka & Pospíšilová, 2003; Monti et al , 2006 a ). The results of this study show that, in spite of a moderate effect on total accumulated dry biomass (Barbanti et al , 2007), water stress and rehydration clearly disturbed the natural course of P n of individual leaves during the ontogeny.…”

“…The changes in photosynthesis of individual leaves at variable water regimes or after rehydration have not received much attention as well (Pospíšilová et al , 2001; Vomáčka & Pospíšilová, 2003; Monti et al , 2006 a ). Woodward (1976) pointed out how in soybean, despite young plus mature leaves as a whole can ensure a fairly stable carbon assimilation rate through the growth cycle, individual leaves have very different photosynthetic capacities, both referring to same age leaves at variable phenological stage and to coexistent leaves of different age.…”

“…The authors concluded that this was somewhat related to a reduction of the root apparatus caused by drought. However, to what extent the photosynthesis is reversible after rehydration is still debatable, as recent findings on sugar beet show that photosynthesis can be completely recovered (Pospíšilová et al , 2001; Vomáčka & Pospíšilová, 2003; Monti et al , 2006 a ). Therefore, the main objective of this research was to assess how and to what extent photosynthesis decreases in individual leaves of sugar beet during the ontogeny and leaf ageing, and, if and why the negative effects of water stress may be reversible after rehydration.…”

Comparative Effect of Ca, K, Mn and B on Post-Drought Stress Recovery in Tea [<i>Camellia sinensis</i> (L.) O <i>Kuntze</i>]

“…However, recovery of stress induced damages after post-stress rehydration in terms of regaining antioxidative properties and photosynthetic functions has been reported earlier [1]. There are many studies on the water stress effects and rehydration response [1] and enhancement of recovery by hormone treatment [3]. However, role of nutrients (micro & macro) in post-drought recovering plant is one of the important areas to be explored.…”