الفهرس 
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Abstract
Two field experiments were conducted at the Experimental Farm, Faculty
of Agriculture (Saba Basha), Alexandria University, Egypt, during 2018/2019
and 2019/2020 cropping seasons to study the wheat performance of some wheat
varieties under drought conditions and using genetic markers to define its.
5.1. Experimental design:
A split- plot system in three replicates was applied. The treatments can
be illustrated as follows:
5.1.1. Main plots (drought stress):
1. Full irrigations (control).
2. Skipping one irrigation at the growth stage.
3. Skipping one irrigation at grain filling stage.
5.1.2. Sub-plots (wheat varieties):
1. Gemmieza 11.
2. Giza 168.
3. Giza171.
4. Shandawee l.
The preceding crop was maize (Zea mays L.) in both cropping seasons.
Soil samples of the experimental sites were taken at the depth of (0-30 cm).
5.2. Studied characteristics:
5.2.1. Growth parameter:
1. Plant height (cm).
2. Dry matter accumulation.
3. Leaf area index (LAI).
4. Total chlorophyll content of wheat leaves
5.3. Yield and its components:
1. Tillers number /m2
.
2. Spikes number/m2
.
3. Spikelets number/spike.
4. Grains number/spike 5. 1000- kernel weight (g).
6. Grain yield (kg/fed.).
7. Straw yield (t/ha.).
8. Biological yield = grain yield + straw yield (t/ha).
9. Harvest index (HI %).