Genetic variability and correlation in maize inbred lines under irrigated and moisture stress condition
Maize, one of the most widely grown cereals in the world and is called as queen of cereal due to its productivity. The experiment was conducted to assess the extent of genetic variability and correlation for yield and its attributing traits under irrigated and moisture stress conditions (stress imposed during flowering stage) at two locations viz., Department of Millets, TNAU, Coimbatore and Maize Research Station, Vagarai. A total of thirteen biometrical parameters were recorded. High values of GCV, heritability and genetic advance per cent, respectively was noted for the traits Anthesis Silking Interval (ASI) (36.51,78.51 & 66.63%), number of kernels per row (29.08, 80.50 & 53.75%), hundred grain weight (28.54, 82.16 & 53.29%) and yield (21.37, 73.85 & 37.83%) under irrigated condition, and the traits cob yield (29.78, 71.49 & 51.87%), ASI (29.03, 72.52 & 50.93%), hundred grain weight (26.86, 80.76 & 49.73%) and cob placement height (21.34,78.75 & 39.01%) under stress condition. This indicates that the selection based on these traits may be influenced by additive gene action and would be quite effective. The correlation analysis revealed a positive association of the traits hundred grain weight (0.592, 0.536), number of kernels per row (0.430, 0.397), number of kernel rows per cob (0.415, 0.382) and plant height (0.303, 0.316) with grain yield under both ecosystems (irrigated and moisture stress) and these traits can be given importance while the selection of promising individuals for grain yield. Days to 50% per cent tasseling (-0.496, -0.240) and silking (-0.565, -0.358) recorded significant negative association with yield and it can be used for the development of early duration lines. Further the significant negative ASI could be exploited to develop drought tolerant inbred lines in maize.
Key words: Zea mays, water stress, ASI, GCV, heritability, genotypic correlation.
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.