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Morphological and physiological response of sorghum (Sorghum bicolor L. Moench) to different pattern of drought
Titre : Morphological and physiological response of sorghum (Sorghum bicolor L. Moench) to different pattern of drought
Auteur : Alhassan Lansah Abdulai
Université de soutenance : Universitat zu Bonn
Grade : Master of Science 2005
Résumé
Drought is a major stress affecting rainfed sorghum production systems. An
experiment was setup in a green
house to evaluate the morphological and physiological
responses of sorghum to different drought patterns. Two -
week old seedlings of “ICSV
111 IN” were transplanted into 9 L pots filled with loamy sand (11.3 kg) or si
lt loam (10.8
kg) and grown for one month.
Pots were subjected
either
to constant drought (70% of
field capacity (CD)) or
to
progressive drought (slow drying -
out close to permanent
wilting point (PD)).
Growths, biomass accumulation, assimilate partitioni
ng
,
xylem ABA content
, gas
exchange, and
plant water relations
were
determined.
Drought effects were more
pronounced on loamy sand than on silt loam. Soil moisture content, rather than soil
water potential triggered drought responses. Constant drought
and
Progressive drought
conditions reduced growth and biomass accumulation, as well as all the gas exchange
components, in both loamy sand and silt loam. Assimilate partitioning did not change
under
constant drought
conditions
, but was shifted in favor of roots under progressive
drought conditions
. Xylem ABA content increased (more pronounced on loamy sand
than silt loam) under
progressive drought
conditions, but was not affected by
constant
drought
conditions.
The genotype adjusted and adapted to constant drought conditions
but employed survival mechanisms under progressive drought conditions
.
Page publiée le 11 janvier 2012, mise à jour le 4 mai 2018