English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

bulk tissue elastic modulus (wall rigidity) which resulted in turgor loss at the same h in both stressed Ber (Ziziphus mauritiana Lamk.) is a major fruit tree and unstressed leaves. The possible ecological signicrop of the north-west Indian arid zone. In a study of ficance of maintenance of turgor potential and cell the physiological basis of drought tolerance in this volume at low water potentials for drought tolerance species, two glasshouse experiments were conducted in Ziziphus is discussed. in which trees were droughted during single stresscycles. In the first experiment, during a 13 d drying Key words: Ziziphus mauritiana, drought, solute accumulacycle, pre-dawn leaf water (Y leaf ) and osmotic (Y p ) tion, osmotic adjustment, proline. potentials in droughted trees declined from ’0.5 and ’1.4 MPa to ’1.7 and ’2.2 MPa, respectively, for a decrease in relative water content (h) of 14%. During Introduction drought stress, changes in sugar metabolism were associated with significant increases in concentra- Drought is probably the most important factor limiting tions of hexose sugars (3.8-fold), cyclitol (scyllo- crop productivity world-wide (Jones and Corlett, 1992). inositol; 1.5-fold), and proline (35-fold; expressed per In semi-arid regions, where the amounts and patterns of unit dry weight), suggesting that altered solute parti- seasonal rainfall are often erratic and unpredictable, deeptioning may be an important factor in drought toler- rooting perennial species may exploit deep soil water ance of Ziziphus. On rewatering, pre-dawn Y leaf and h reserves. This facilitates production of yields in situations recovered fully, but Y p remained depressed by 0.4 MPa of high light coupled with drought, where shallow-rooted relative to control values, indicating that solute con- annual crops would normally fail. The use of perennials centration per unit water content had changed during may help buVer farmers’ production against year-to-year the drought cycle. fluctuations in yields from annual crop species. Under Evidence for osmotic adjustment was provided from such conditions, an ability to maintain cell water status a second study during which a gradual drought (e.g. through osmotic adjustment and/or leaf area adjustwas imposed. Pressure‐volume analysis revealed a ment) and cell integrity (by protecting cells against photo0.7 MPa reduction in osmotic potential at full turgor, and chemical oxidation) may be an advantage. There are with Y leaf at turgor loss depressed by ~1 MPa in many cases where plants growing in hostile environments drought-stressed leaves. Coupled with osmotic adjust- exhibit increased oxy-stress enzyme activities to combat lipid peroxidation by free radicals, hydrogen peroxide

The role of solute accumulation, osmotic adjustment and changes in cell wall elasticity in drought tolerance in Ziziphus mauritiana (Lamk.)