Agriculture Reference
In-Depth Information
TABLE 9.3
(Continued)
Plant traits
Effects relevant for yield
Modulation under stress
References
Cuticular tol-
erance and
surface rough-
ness
Higher or lower water loss,
modification
of boundary layer and
reflectance
-
Kerstiens
(1996)
Photosynthetic
pathway
C3/C4/CAM, higher WUE
and greater heat tolerance
of C4 and CAM
-
Cushman
(2001)
Osmotic
adjustment
Accumulation of solutes:
ions, sugars,
poly sugars, amino acids,
glycine betaine
Slow response to water
potential
Serraj and
Sinclair
(2002)
Membrane
composition
Increased membrane stabil-
ity and changes
in aquaporin function
Regulation in response to
water potential changes
Tyerman et al.
(2002)
Antioxidative
defense
Protection against active
oxygen species
Acclimation of defense
systems
Reddy et al.
(2004)
Accumula-
tion of
stress-related
proteins
Involved in the protection
of cellular
structure and protein activi-
ties
Accumulated under stress
Ramanjulu
and Bartels
(2002), Cat-
tivelli et al.
(2002)
Source:
Cattivelli et al. (2008); Kumar et al. (2012).
9.3 PHYSIOLOGICAL PARAMETERS HELP IN SCREENING
DROUGHT RESISTANT VARIETEIES
Screening of genotypes for drought tolerance would be accelerated with
a greater understanding of physiological traits involved in drought tol-
erance. Many physiological characters responsible for continued growth
under water stress have been identified. The interacting effect of all physi-
ological parameters depends on growth strategy of the species considered,
and their ability to adjust during drought stress. Some of the physiological
parameters that are noticeably affected by water deficit conditions and can
