Assessment of genetic variability in lowland sub1 introgressed rice genotypes showing tolerance to submergence and stagnant flooding
The present investigation is carried out to establish the nature of relation between grain yield and yield components by partitioning the correlation coefficients between grain yield and its components into direct and indirect effects by using simple correlation and path analysis .By the help of correlation coefficients Selection index were constructed to increase the selection efficiency .A correlation coefficient and path analysis study was conducted in 51 low land Rice with tolerance to submergence and stagnant flooding for ten component characters including grain yield. The results indicated that grain yield was positively correlated with days to flowering, plant height, fertile grain number and fertility percentage indicating the importance of such traits for realization of high yield in rice. The traits like days to 50% flowering exhibited maximum positive direct effect on grain yield followed by plant height, grain yield per plant, fertility percentage and 100-grain weight, thus, indicating the importance of such traits as criteria for selection for realization of higher productivity. Using grain yield as economic criterion, ten selection indices were constructed. On the basis of selection criteria, the promising genotypes selected were IR 85086-SUB 33-3-2-1, IR 88760-SUB 93-3-3-3, Upahar, IR 88250-20-1-1-3, Jagabandhu, IR 88230-60-1-2-2, CR1009 sub 1, IR 87092-26-3-1-3, Savitri, IR 87098-55-2-1, Mahanadi, PSBRc 68, Swarna, Swarna-sub 1, PSBRc 70. evaluation of sub 1 introgressed line in normal condition i.e. how the sub 1 lines are performing without the occurrence of flood. The genotypes like savitri-sub 1, IR 64-sub 1 , PSBRc 18- sub1 , IR 85086-SUB 33-3-2-1, IR 87439-BTN-145-2-1, IR 88228-33-3-5-2, IR 88234-STG 11-1-1-1, IR 88250-20-1-1-3, IR 88764-SUB 30-1-1-2 and IR 88776-SUB 8-1-1-2 had shown high level of submergence tolerance through screening under control conditions.
It is certified that:
- The corresponding author is fully responsible for any disputes arising due to the publication of his/her manuscript.
- The article has been seen by all the authors who are satisfied with its form and content.
- The sequence of names of authors in the by-line is as per their relative contribution to this experiment, giving due credit to all scientists who made notable contribution to it.
- All the authors fully understand that inclusion of any other co-authors or exclusion of any co-authors is not possible once the article has been submitted to the journal.
- The corresponding author takes full responsibility for this article.
- The address of the organization where the research was conducted is given.
- The article is exclusive for this journal, and the results reported here have not been sent (and will not be sent during its consideration by this journal) for publication in any other journal.
- Authors agree to abide by the objective comments of referees and do agree to modify the article into a short note as per the recommendation, for publication in the Electronic Journal of Plant Breeding.
- If published in Electronic Journal of Plant Breeding, the copyright of this article would vest with the Indian Society of Plant Breeders, who will have the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in it, and neither we nor our legal heirs will have any claims on royalty.