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STUDIES ON DROUGHT TOLERANCE IN SUNFLOWER GENOTYPES

KrishiKosh

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Title STUDIES ON DROUGHT TOLERANCE IN SUNFLOWER GENOTYPES
 
Creator SANTHOSH, B
 
Contributor NARENDER REDDY, S
 
Subject DROUGHT, TOLERANCE, SUNFLOWER, GENOTYPES
 
Description A research project entitled “Studies on drought tolerance in sunflower
genotypes” was conducted with two experiments namely “Drought tolerance of
sunflower parental lines at seedling stage” and “Understanding the mechanism of
drought tolerance”.
The first experiment was carried out at Department of Crop Physiology
Laboratory, College of Agriculture, ANGRAU, Rajendranagar. Thirty nine sunflower
genotypes were screened by subjecting them to water stress in the laboratory by treating
with PEG (Poly ethylene glycol) solution at different concentrations viz., 0.0, -0.2, -0.4,
-0.6 and -0.8 MPa. Germination percentage, root length, shoot length and seedling dry
weight decreased with increase in osmotic stress. Based on the above characters, DRSF-
113 and EC-602063 were selected as tolerant and GMU-337 and GMU-437 were
identified as less tolerant to moisture stress. These genotypes were studied in field
experiment.
The second experiment was conducted on sandy loam soil at student’s farm,
College of Agriculture, ANGRAU, Rajendranagar, during late rabi 2013-14 in a strip
plot design. Stress was assigned to main plots viz., control and water stress and
constituted sub plots, four sunflower genotypes viz., GMU-337, GMU-437, EC-602063
and DRSF-113.
Water stress imposed from 30-65 DAS resulted in decreased plant height, leaf
number, days to 50% flowering, days to maturity, LAI, crop growth rate, SCMR values,
stomatal conductance, fluorescence, photosynthetic rate, chlorophyll stability index,
membrane stability index, while, proline content was increased under moisture stress.
The water stress imposition has also negatively influenced yield related
attributes like capitulum diameter, capitulum dry weight, total number of seeds per
capitulum, test weight seed yield per plant in water stress treatments as compared to
control.
Among the genotypes DRSF-113 and EC-602063 recorded better values for
morphological, physiological characters and yield attributes over other genotypes both
under moisture stress and control conditions. Among the four genotypes studied DRSF-
113 and EC-602063 showed better drought tolerance as compared to GMU-337 and
GMU-437.
 
Date 2016-09-08T10:26:15Z
2016-09-08T10:26:15Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/75959
 
Language en
 
Relation D9660;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD