19] reported that moisture stress at pollination stage influenced grain setting of corn by decreasing photosynthesis and decreased grain number per cab row owing to the increase in the number of sterile pollens which were produced due to the deficiency of assimilates.
Stem dry weight was decreased in the treatment of the removal of upper leaves of cab compared to control which indicates the deficiency of assimilates and the incapability of leaves in supplying enough assimilates.
In the treatment of removal of lower leaves of cab, TGW was decreased due to the deficiency of assimilates.
Larson and Whitham (1991) showed that aphid-induced galls may compete for assimilates with plant sinks such as flowers and fruits.
This aphid induces mobilizing sinks that draw assimilates from neighboring leaves.
In a preliminary study on the sources of assimilates imported into galls of a guild of aphid species (Homoptera; Pemphigidae) that forms galls on Pistacia palaestina Boiss.
The participation of stem reserves assimilates in yield at stressful condition significantly was not more of optimum environment.
There fore we can conclude that remobilization and translocation of assimilates have main role in the Grain yield.
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