Annals of Biological Research
Abstract
Author(s): Morteza Abdi1, Reza Zarghami2, Farshad Ghoushchi1
In order to study the effects of dryness stress and changes in the source and destination on the performance and the
elements of performance in sunflower, a test was carried out in split plot form in the template of full random blocks
experiments in three intervals. The test was performed at the research farm of Islamic Azad University, Varamin-
Pishva Branch in Ghaleh-e-sin of Varamin in summer 2013. The main factor included four irrigation levels
(dryness stress) based on the morphologic a1: desirable ( full irrigation once per eight days), a2: No irrigation
from budding to flowering, a3: no irrigation from flowering to the beginning of seed filling, a4: no irrigation from
seed filing to physiological maturity of seeds; and the sub-factors of changes in source and replacement reservoirs
consisted of) b1: control without manipulation, b2: omission of 33% of the leave, and, b3: omission of 66% of
leaves. Based on the results, different levels of irrigation had highly significant effects (P<0.01) on characteristics
such as number of seeds per receptacle, the 1000-seed weight and the seed performance. In addition,
characteristics such as the diameter of receptacle were easily affected with five percent significance in statistical
level. Furthermore; characteristics such as receptacle diameter; too, were affected by different levels of leave
deletion (omitting leave) with five percent significance in statistical level. The results showed that the non-irrigation
treatment from the flowering initiation stage to the seeds filling would decrease the seed performance for
approximately 52.40 percent, compared to full irrigation treatment
