DEVELOPMENT AND IDENTIFICATION OF SUPERIOR HYBRIDS WITH LEAF BLAST RESISTANCE IN RICE (Oryza sativa. L)
Loading...
Files
Date
2018
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY
Abstract
The present investigation entitled “DEVELOPMENT AND IDENTIFICATION
OF SUPERIOR HYBRIDS WITH LEAF BLAST RESISTANCE IN RICE (Oryza
sativa L.)” was undertaken to study the gene action, combining ability and magnitude of
heterosis of experimental hybrids for grain yield per plant and yield contributing
characters.
The analysis of variance for grain yield and yield contributing characters revealed
significant difference between the treatments for all the characters under study indicating
that there was sufficient variability among the lines tested. Hence, combining ability
analysis was carried out.
The analysis of variance for combining ability revealed significant difference
between the treatments for grain yield per plant and all the component traits, thus
justifying their use in the present investigation. Similarly, hybrids also varied
considerably between themselves, suggesting the wide variability among the crosses. The
analysis of variance for combining ability revealed that no significant differences were
recorded for replications for all the traits. The lines were found significant for certain
characters viz., days to 50 per cent flowering, plant height, number of productive tillers,
panicle weight, 1000 grain weight, kernel breadth and length-breadth ratio. The testers
were significant for 1000 grain weight while the interaction between lines and testers
were significant for all the traits except kernel breadth.
On the whole based on the overall mean performance, gca effects and sca effects,
CMS 64A was the best tester while among the lines, WGL 14 and IET 26264 performed
better. Among the hybrids, CMS 64A x WGL 14, CMS 59A x WGL 14 and CMS 23A x
IET 26264 performed superior to hybrid check US 312.
The overall study of sca effects of different traits, in the present investigation reveals
that sca effects of per se performance of the crosses were not closely related. The crosses
with high per se performance need not be the one with high sca effects and vice versa.
The reason ascribed is due to positive interaction between nuclear and cytoplasmic genes
appear to be important than the interaction between nuclear genes alone. It is evident from
the different studies, the predominance of non-additive gene action over the additive
component, which is ideal for exploitation through heterosis breeding.
Heterosis for grain yield per plant is mainly because of simultaneous manifestation
of heterosis for yield component traits. Out of 32 hybrids studied, the significant standard
heterosis was observed in 3 hybrids viz., CMS 59A x WGL 14 (54.89), CMS 23A x IET
26264 (46.60) and CMS 64A x WGL 14 (30.43) over standard hybrid check, US 312.
From the blast screening experiments by UBN (Uniform Blast Nursery) method, it
was found that four hybrids and three parents are resistant to screening reaction; 11
hybrids and five parents are moderately susceptible and four parents are highly
susceptible to the blast disease. The parents which showed resistant reaction were JGL
180457, IET 26274 and JMS 13B which can be used as parents for development of blast
resistant varieties and hybrids. JMS 13A x JGL 180457, CMS 23A x RNR 11450, JMS
13A x IET 26264 and JMS 13A x IET 26274.
From this study, three hybrids viz., CMS 59A x WGL 14, CMS 64A x WGL 14
and CMS 23A x IET 26264 were identified as best hybrids with high significant standard
heterosis for grain yield and yield contributing characters, high sca effects and moderate
blast resistance. These hybrids are recommended for further testing over locations and
seasons, for stable performance.
Description
Keywords
Citation
D10,303