EFFECT OF REPRODUCTIVE STAGE DROUGHT ON RICE PHYSIOLOGY
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Date
2002
Authors
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Publisher
Indira Gandhi Krishi Vishwavidyalya, Raipur
Abstract
The present studies entitled "Effect of reproductive stage drought on rice
physiology" was conducted at the Instructional Farm of IGAU, Raipur during wet
season of 2000. The objectives of the study was to find out the effect of
reproductive stage drought on dry matter production and its partitioning into
various plant parts, photosynthetic stability, membrane stability, phenology, root
growth, ability to maintain leaf water potential, contribution of stem to built grain
yield, transpiration rate and yield of different rice varieties. Varieties were
staggered in the nursery to match the phenological stages during experiment.
Drought was imposed by stopping irrigation from fifteen days after panicle stage
to maturity. Rain out shelters were used to protect the drought plots from rains.
Dry matter production capacity reduced under drought as the drought
progress from flowering to maturity. The ability to maintain higher leaf water
potential and photosynthetic stability was related with stability in dry matter
production under drought. Drought tended to delay the flowering. The delay in
flowering due to drought was associated with higher yield reduction. It was
noticed that membrane stability contributes significantly to the drought resistance
at reproductive stage drought. Crop growth and grain yield under drought was
strongly influenced by the root growth. The varieties with good root system keeps
the aerial parts well supplied with water. Such a regular flow of water was also
reflected in higher transpiration rate. Translocation of dry matter from stem
increases under drought conditions and was related with yield stability. The
reproductive stage drought resistance in rice was related with photosynthetic
stability, maintenance of higher leaf water potential, higher remobilization of
stored assimilates to grain, higher root growth and less delay in flowering.
Description
Keywords
REPRODUCTIVE STAGE DROUGHT, RICE PHYSIOLOGY
Citation
117 p.