1. Growth Stress Response (Agronomical Stress Response)

2. Growth Stress Response
Germination inhibition
Growth reduction
Premature senescence
Reduction in productivity

3. Tolerance Yield base Use Efficiency base Yield:
The reduction in yield under stress conditions compared to yield under optimal condition of cultivation
Use Efficiency base
The ratio between the yield and unit of resource available to the plant
Yield:
The combination of distinct independent processes (agronomical and Physiological component)
Primary trait for selection in breeding programs aims at increasing yield potential and at achieving adaptation to stress –prone environment

4. Selection The way to improve genetic material
Directly to a primary trait in a target environment (empirical breeding approach)
Indirectly for a secondary trait that must be particularly putative to a higher yield potential and/or to employ behavior of crop when grown in a stressful environment (analytical breeding approach)
Most of the progress has been derived from an empirical breeding by taken yield as the main trait for selection
Traditional breeding reaches a plateau

5. Yield related traits
Agronomic-traits
A characteristics in plant that will add economic value to agricultural production
Yield component
Individual plant part directly contributing to yield on their number, size and/or weight
Characteristics that contributed to economic yield
The yield component of each crops are different, they should be evaluated through some statistical analysis
To be useful in a breeding program, it must comply with several requirement:

6. Several General Requirements
It must be genetically correlated with grain yield in the larger environment
It should be less affected by environment that grain yield. It should have greater heritability than yield itself and less GE interaction
It must show genetic variability within the species
It should not associated with poor yield in unstressed environment
It must lend itself to rapid and reliable measurement, and measurement should be less expensive than determining yield it self
It must lend itself to assessment in individual plants or in vary small plot

7. Several Requirements to improve selection response to stress condition
Improve precision
Prevent confounding effect of stress on yield
Focus the selection on specific type
Cheaper, easier and faster to measure than grain yield

8. Difficulties in Abiotic Stress Breeding
Screening techniques require high scale and are time consuming
Creation of artificial condition is expensive
Under field screening, it may not provide optimum conditions
In vitro techniques are to be followed though it is expensive
Abiotic stress breeding depends mostly on physiological traits which are not stable

9. It should base on yield response to stress condition
Genotypes Grouping
It should base on yield response to stress condition
Group
Category A
Producing high yield under both stress and non stress condition B
Producing high yield under non-stress condition C
Producing high yield under stress condition D
Producing low yield both under non-stress and stress condition