الفهرس 
Effect of gamma irradiation
MATERIALS AND METHODSOnly 14 pages are availabe for public view
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Abstract
The effect of three doses of gamma irradiation ( 0, 20 and 30
Gy) and their effect on three cultivars of snap bean Paulista, Xera and Bronco under different
sowing dates ,i.e. the 1st, 8th and 15th of October was studied in an experimental farm during
2011/2012 and 2012/2013 seasons. The results revealed that the 1st of October scored the highest
leaf and stem dry weight at all ages , plant length , leaf number at 30 DAP , leaf and stem fresh
weight at 45 and 60 DAP, leaf area, number of branches and leaf area at 60 DAP. On the other hand,
the 8th of October led to the highest values of plant length at all ages, leaf and stem fresh
weight and leaf dry weight at 30 DAP, leaf area and number of branches at 30 and 45 DAP, stem fresh
weight at 45 DAP and leaf number at 30 and 60 DAP. Regarding the effect of cultivars, cv. Bronco
gave the highest leaf and stem fresh weight and leaf area at all ages, leaf number at 30 DAP and
leaf dry weight at 45 and 60 DAP, whereas cultivar Paulista had the highest leaf and branch
number and stem dry weight, also cultivar Xera gave the highest plant length and branch number at
30 DAP and leaf number and stem fresh and dry weight. Concerning gamma irradiation effect , 20 Gy
significantly increased all growth parameters except leaf fresh weight at 45 DAP, stem dry weight
at 30 DAP, plant length, leaf number and stem dry weight at 30 and 60 DAP, number of branches and
leaf area at 60 DAP. On the other hand, 30 Gy produced the highest leaf fresh weight at 30 and 45
DAP, leaf number, number of branches, leaf dry
weight and leaf area at 60 DAP. As for chemical constituents ,the 1st
and 8th of October scored the highest gibberellin and indole acetic acid content, while the 15th of
October gave the highest values of chlorophyll reading , total phenols and proline content in the
first