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"PHYSIOLOGICAL CHARACTWIZATlBN OF RICE GERMPLASM FOR DROUGHT TOLERANCE AND YIELD REGULATING MECHANISM UNDER DIFFERENT WATER PEGIMES

KrishiKosh

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Title "PHYSIOLOGICAL CHARACTWIZATlBN OF RICE GERMPLASM FOR DROUGHT TOLERANCE AND YIELD REGULATING MECHANISM UNDER DIFFERENT WATER PEGIMES
 
Creator Gupta, Reena
 
Contributor Guhey, Dr. Arti
 
Subject PHYSIOLOGICAL CHARACTWIZATlBN, RICE GERMPLASM, DROUGHT TOLERANCE, YIELD REGULATING MECHANISM, DIFFERENT WATER PEGIMES
 
Description The Present investigation entitled "Physiological characterization of rice
germplasm for drought tolerance and yield regulating mechanism mder
different water regimes" was conducted at Instructional f- of I.G.~u,
KPdur~ing kharif season of 2006 and 2007 with twenty germplasm lines.
The experiment was also canied out in net house (control condition) and rain
out sheher to protect the drought plots fiom rain and also for getting the
samples for biochemical analysis. Germplasm is a valuable source of base
population and provides the material for breeding. The nature and magnitude
of divergence would help the plant breeder in choosing the right type of
parents for broad spectrum of variability. Henceforth, physiological
characterization of these germplasm is an urgent need to emphasii the
identification of desirable genotypes for exploration in a breeding programme
which is mainly aimed to improve the drought tolerance and to break the yield
ceiling. The objectives of this study was to identify the reliable indices as a
selection criterion for tolerance to water deficit and also to determine the
physiological traits contributing to the tolerance for water stress in target
environment. The physiological (relative water content, photosynthetic rate,
transpiration rate and apparent translocation rate)mrphology (leaf area, plant
height and number of tillers),phenology (days to panicle initiation, 50%
flowering and &ys to maturity) root characteristics, anatomical root study and
biochemical (prohe content, membrane stability index and chlorophyll
content) were recorded at various growth stages.
rainfed condition, genotype tends to delay the flowering which
seems to be a key cause of yield reduction of the genotypes. Findings clearly
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conferred that the genotypes viz. Lakhokunwar, Bhatagunnatia and Uraibuta
have expressed better root mining ability through deeper root system and
adequate root growth desirable for efficient water uptake. Studies clearly
revealed that the remarkable differences do exist in anatomical features
(ground tissues and vascular bundles) in genotypes (Lakhokunwar, Uraibuta,
Bhatagurmatia, Banspor, Luchai and Kanakchudi) in irrigated and rainfed
conditions. The higher grain yield of Uraibuta and Banspor under rainfed site
can be related with maintenance of high leaf water status, less delay in
flowering, photosynthetic stability, high apparent translocation rate and
spikelet fertility. The result indicated that yield can be regulated either by
extended photosynthetic traits or by partitioning of biomass to the grains.
Mobilization of assimilates under rainfed condition was triggered coupled
with higher translocation rate from shoot to grains in these genotypes. Leaf
rolling and reduced leaf area are the major indicators exhibiting the cultivars
ability to maintain a favourable water status under stress. The maintenance of
plant water status and sustained metabolic function after stress are the key
components of drought stress. In general the grain yield reduction in rainfed
condition was approximately estimated 34.19 percent over the control.
On the basis of association analysis studies in irrigated condition, the
grain growth rate, chlorophyll stability index and harvest index determines the
assimilate partitioning while in rainfed condition the relative water content,
membrane stability index and apparent translocation rate were found to be the
key traits for grain yield. Hence forth in nutshell, study revealed that for
producing gain yield during drought depends on action and interaction of
different morphological (earliness, reduced leaf area, leaf rolling, efficient
rooting system reduced tillering and yield stability), physiological (reduced
transpiration, higher plant water status and stomata1 closure) and biochemical
(accumulation of proline) traits.
 
Date 2016-02-06T11:06:04Z
2016-02-06T11:06:04Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64181
 
Language en
 
Format application/pdf
 
Publisher Indira Gandhi Krishi Vishwavidyalaya, Raipur