Record Details

STUDIES ON SEEDLING COLD TOLERANCE AND VALIDATION OF INDENTIFIED QTLS IN RICE GENOTPES

KrishiKosh

View Archive Info
 
 
Field Value
 
Title STUDIES ON SEEDLING COLD TOLERANCE AND VALIDATION OF INDENTIFIED QTLS IN RICE GENOTPES
 
Creator SARITA PRADHAN
 
Contributor JHANSI RANI, K
 
Subject tolerance, rice, developmental stages, genotypes, germinability, planting, biological phenomena, sowing, yields, genetics
 
Description Rice (Oryza sativa L.) is one of the most important food crops and primary
source of food for more than half the world’s population. Among the biotic factors
affecting rice productivity cold is the major factor which results in low productivity
and delay maturity especially during post rainy season. The problem is more
pronounced in Northern districts of Telangana state. The low temperature prevailing
during December and January results in poor germination and establishment. To
breed cold tolerant rice cultivars, effective screening techniques are essential. As
field evaluation for cold tolerance is less accurate due to environmental variation,
screening under control temperature in the laboratory would be more reliable. Hence,
39 rice genotypes were evaluated for cold tolerance at germination and early seedling
growth stage at normal and 150C temperature.P
Germination was significantly high in RNR 21579, Sathya, MTU 1010 and
Krishna. Germination index was high in Pusa 1121, Krishna and KNM 110. The
percentage of seeds with coleoptiles superior to 5 mm was high in Krishna, JGL
11118, Bhadrakali and Varalu and percentage of reduction in coleoptiles length was
high in MTU 1010, Varalu and JGL 11470.The difference between germination
under control and cold temperature was low in Tellahamsa, Pusa 1121, KNM 110
and Taramathi, which have capacity to survive under cold temperature. Highest
difference in germination percentage under control and cold temperature are RNR
21579, RNR 21588, MTU 1010, RNR 17420 and MTU 1075, this may be due to
cold susceptibility.
The same set of genotypes under field evaluation during late kharif planting
showed differential response, when the crop was subjected to cold at reproductive
stage. The none of the genotypes were superior to checks for field emergence. The
seed yield was high in Taramati, RNR 21582 WGL 44, compared to checks Sheetal,
Tellahamsa and JGL 3844.
The confirmation of QTLs presence among genotypes against cold tolerance
was done through the genetic level using SSR markers. The molecular profling of
these genotypes was done for presence of already known QTLs with available linked
markers using Sheetal and JGL 3844 as positive control and MTU 1010 as a
susceptible control. Among the 48 genotypes 9 genotypes showed resistance at
genetic level by showing QTLs. When the same genotypes were observed for cold
resistance at phenotypic level only two genotypes viz., WGL 32100 and RNR 15048
showed resistance, whereas RNR 174 20 was resistant at molecular level but
susceptible to phenotypic level.
 
Date 2017-01-02T15:21:57Z
2017-01-02T15:21:57Z
2016
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/93996
 
Language en
 
Relation D10007;
 
Format application/pdf
 
Publisher PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD