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for drought tolerance have been realized using different procedures (Table
9.2). Traditionally, plant physiologists have addressed the problem of en-
vironmental stress by selecting for suitability of performance over a series
of environmental conditions using extensive testing (Blum, 1988).
TABLE 9.2
Screening Procedure for Drought Tolerance
S. No.
Instruments/techniques
used
Purpose of screening
References
1
Infrared thermometry
Efficient water uptake
Blum et al., 1982
2
Banding herbicide
metribuzin at a certain
depth of soil, and use of
iodine-131 and hydro-
ponic culture under stress
of 15 bar
Root growth
Robertson et al.,
1985; Ugherughe,
1986
3
Adaptation of psychomet-
ric procedure
Evaluation of osmotic
adjustment
Morgan, 1980; 1983
4
Diffusion porometry
technique
Leaf water conductance
Gay, 1986
5
Mini-rhizotron technique
Root penetration, distribu-
tion and density in the field
Bohm, 1974
6
Infrared aerial photog-
raphy
Dehydration postponement
Blum et al., 1978
7
Carbon isotopediscrimina-
tion
Increased water-use ef-
ficiency
Farquhar and Rich-
ards, 1984
8
Drought index measure-
ment
Total yield and number of
fruits
Clarke et al., 1984;
Ndunguru et al., 1995
9
Visual scoring or mea-
surement
Maturity, leaf molding, leaf
length, angle, orientation,
root morphology and other
morphological characters
Mitra, 2001
Source: Kumar et al. (2012).
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