ABA AND SUNFLOWER TOLERANCE TO WATER STRESS

A. Hassan, A.; Ahmed, S.A.

	ABA AND SUNFLOWER TOLERANCE TO WATER STRESS
IRAQ JOURNAL OF AGRICULTURE
Article 1, Volume 19, Issue 6, 2014, Pages 0-0
Authors
A. A. Hassan; S.A. Ahmed
Abstract
A field study was conducted during two spring season (2012 and 2013) at the experimental farm of the Dept. P Field Crop, College of Agriculture, University of Baghdad that was study the effect of different treatments of irrigation and concentrations of abscisic acid (ABA) in yield and its components, evapotranspiration and water use efficiency, by using randomized complete block design in the arrangement of a split-plot with three replications. Irrigation treatments: control treatment (50% of available water) 70, 50, 30% water of the control treatment were assigned in the main plots while concentrations of (ABA) (0, 2.5, 5 and 7.5) micromole were assigned in the sup plots. The results showed that the treatment of irrigation control (50% of available water) gave the highest average of the relative water content and chlorophyll and turgor pressure and oil content in seeds was (80.15 and 81.09%) and (43.07 and 41.43 mg g-1 weight fresh) and (2.45 and 2.54 MPa) and (40.91 and 40.74%) for both seasons, which don't differ significantly from the treatment of 70% of the irrigation treatment (control), which gave an average of (77.17 and 80.21%) and (41.71 and 40.38 mg g-1 weight fresh) and (2.34 and 2.47 MPa) and (40.19 and 39.79%) for both seasons, while the treatment of irrigation recorded 30% of the treatment (control), the highest average for proline content was (3.85 and 3.14 mg g-1)and saturation deficit ratio (36.08 and 27.91%) for both seasons. Affected the concentrations of Abscisic Acid in significant characteristics physiological, as the superiority of concentrations 7.5 micromole ABA significant and gave the average water content relative (73.97 and 77.27%) and proline content (3.73, 2.01 mg g-1) and chlorophyll content (40.46 and 40.83 mg g-1) weight fresh and turgor pressure (2.23 and 2.31) MPa for two seasons and effectiveness of the peroxidase enzyme (73.13 absorption unit. g-1) for the second season only. Conclusion from this that spray abscisic acid has improved physiological characteristics that help drought tolerance under water deficit circumstances, and the irrigation 70% of the amount of water available had no significant effect on physiological traits and oil content. Thus, we recommend treatment plants sunflower abscisic and acid concentration of 7.5 micromole, irrigation and 70% of the amount of water ready without any impact on the characteristics of Physiology and oil content.

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