scholarly journals Investigation of the limitations to photosynthesis induced by leaf water deficit in field-grown sunflower (Helianthus annuus L.)

1992 ◽  
Vol 15 (6) ◽  
pp. 755-756 ◽  
Author(s):  
R. R. WISE ◽  
J. R. FREDERICK ◽  
D. M. ALM ◽  
D. M. KRAMER ◽  
J. D. HESKETH ◽  
...  
Keyword(s):  
Helianthus Annuus ◽  
Water Deficit ◽  
Leaf Water ◽  
Helianthus Annuus L ◽  
Leaf Water Deficit

Investigation of the limitations to photosynthesis induced by leaf water deficit in field-grown sunflower (Helianthus annuus L.)

1990 ◽  
Vol 13 (9) ◽  
pp. 923-931 ◽  
Author(s):  
R. R. WISE ◽  
J. R. FREDERICK ◽  
D. M. ALM ◽  
D. M. KRAMER ◽  
J. D. HESKETH ◽  
...  
Keyword(s):  
Helianthus Annuus ◽  
Water Deficit ◽  
Leaf Water ◽  
Helianthus Annuus L ◽  
Leaf Water Deficit

Leaf Dehydration Induces Different Content of Phenolics and Ferulic Acid in Drought-Resistant and -Sensitive Genotypes of Spring Triticale

2009 ◽  
Vol 64 (1-2) ◽  
pp. 85-95 ◽  
Author(s):  
Tomasz Hura ◽  
Katarzyna Hura ◽  
Stanisław Grzesiak
Keyword(s):  
Phenolic Compounds ◽  
Ferulic Acid ◽  
Water Deficit ◽  
Photosynthetic Apparatus ◽  
Leaf Water ◽  
Red Fluorescence ◽  
Spring Triticale ◽  
Total Pool ◽  
Drought Resistant ◽  
Leaf Water Deficit

Analyses of the total pool of phenolic compounds and ferulic acid, as a photoprotector of the photosynthetic apparatus, and the activity of L-phenylalanine ammonia-lyase (PAL), as a key enzyme in phenolics synthesis, were carried out. Measurements were performed on drought-resistant (CHD 12, CHD 147) and -sensitive (CHD 220, CHD 247) genotypes of spring triticale during flowering under increasing leaf water deficit. Additionally, the emission of blue and red fluorescence from leaves were estimated.The exclusively in the resistant triticale genotype CHD 247 observed simultaneous increase in the content of ferulic acid and the total pool of phenolic compounds as a response to the leaf water deficit seems to be a promising biochemical indicator for a reliable selection of genotypes most resistant to drought stress. For the other genotypes, an increase in the total pool of phenolic compounds is accompanied by a decrease in the content of ferulic acid. An increase in the emission of red fluorescence, correlated with the high content of phenolic compounds, indicates the possibilities of these substances participating in the mechanisms of adaptation of the photosynthetic apparatus to water deficit in leaf tissues.

Abscisic Acid Levels in Nacl-Treated Barley, Cotton and Saltbush

1991 ◽  
Vol 18 (1) ◽  
pp. 17 ◽  
Author(s):  
Z Kefu ◽  
R Munns ◽  
RW King
Keyword(s):  
Abscisic Acid ◽  
Water Deficit ◽  
Water Status ◽  
Xylem Sap ◽  
Leaf Water ◽  
Leaf Water Status ◽  
Cotton Plants ◽  
Presence And Absence ◽  
Leaf Water Deficit

Exposing barley and cotton plants to 75 mol m-3 NaCl reduced transpiration and increased abscisic acid (ABA) levels in leaves, roots and xylem sap. Exposing saltbush (Atriplex spongiosa) plants to 75 mol m-3 NaCI, at which concentration they grow best, did not affect transpiration or ABA levels but when the NaCl was increased to 150 mol m-3 transpiration fell and ABA levels rose. ABA levels in leaves were high in salt-treated barley and saltbush even when the leaf water status was raised by pressurising the roots. These responses indicate that an increased leaf ABA level was not triggered by leaf water deficit, but by the root's response to the salinity. The flux of ABA in the xylem sap of the three species was more than enough to account for the amount of ABA in leaves, in the presence and absence of salinity. This suggests that the roots may be the source of at least part of the ABA found in leaves.

scholarly journals Decline in stomatal response to leaf water deficit in Corylus maxima cuttings

2001 ◽  
Vol 21 (8) ◽  
pp. 489-496 ◽  
Author(s):  
M. C. Fordham ◽  
R. S. Harrison-Murray ◽  
L. Knight ◽  
C. M. Clay
Keyword(s):  
Water Deficit ◽  
Leaf Water ◽  
Stomatal Response ◽  
Leaf Water Deficit
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