Authors:
Zulkarami Berahim
, Deivaseeno Dorairaj
, Halimi Mohd Saud
, Mohamad Husni Omar
, Nazmin Yaapar
,
Mohd Razi Ismai |
Abstract:
Oryza sativa, rice is the major staple food for half the human population especially Asians.
However, the crop which belongs to the grass family is highly susceptible to drought which
causes huge yield losses in the areas of cultivation. This condition affects physiological and
biochemical processes in rice plant which in turn impacts its productivity. Grain filling which is
the most important determinant of yield is affected if water stress were to occur during the
booting stage. The effect of different water regimes (well watered and water stressed) on the high
yielding rice variety, MR219 was investigated both under rain shelter and field condition. The
objectives of this study were to evaluate the growth, physiological processes, yield and biomass
partitioning of rice plants subjected to water stress. Biomass partitioning, harvest index and
photosynthesis were reduced by 50% under water stress due inefficient translocation of
assimilates. Results from the field study pointed to yield losses that ranged from 60 to 90% under
drought condition as compared to control
|
