Gene action and standard heterosis over environments in Rice (Oryza sativa L.)

  • Sajad Hussain Dar, A.G. Rather, S.Najeeb N.A. Zeerak, Asif B. Shikari, Z.A. Bhat, M.A. Ahanger,S.D. Mir, Mushtaq Ahmad, Shahida Iqbal, Iram Saba and Gazala Hassan
Keywords: Rice, Environment, gene action, heritability, standard heterosis

Abstract

The present study on genetic components of variance carried over individual and pooled environments for thirteen metric
traits in rice revealed the greater magnitude of dominance component than corresponding additive component of variance,
thereby showing greater role of dominance in genetic control for most of the traits. The net dominance effect ( ) was
positively significant for the traits plant height, productive tillers per plant, spikelets per panicle, days to flowering and
maturity. The estimate was non-significant for all the traits studied. The proportion of /4 was less than 0.25 for
all the traits. The proportion of dominance and recessive alleles (KD/KR) in the parents was greater than one for majority
of the traits suggesting preponderance of dominance alleles. The study on genetic ratios revealed that proportion of average
degree of dominance measured from genetic components of variance ( / ) 1/2 was more than unity. The estimates of
/ were more than 0.50 for most of the characters. Low narrow sense heritability estimates were recorded for most of
the traits.Thirteen cross combinations demonstrated the maximum manifestation of standard heterotic effect for grain yield
plant-1 over check varieties Jhelum and Shalimar Rice-1. The magnitude of heterosis over Jhelum and Shalimar Rice-1
ranged from -56.07 to 35.21% and -62.69 to28.29%, respectively. The most promising cross combinations for grain yield
plant-1 in order of merit over standard checks Jhelum and Shalimar Rice-1 included SKAU-389 x K-08-60 (35.21 and
28.29%), Jhelum x K-08-60 (32.22 and 26.20%), SKAU-389 x Pusa Sugandh-5 (30.74 and 24.14%), Jhelum x SKAU-389
(29.07 and 22.58%) and China-988 x Shalimar Rice-1 (27.08 and 22.49%). Further, these crosses revealed high heterosis in
desirable direction for other economically important traits.
Published
05-11-2014
How to Cite
Sajad Hussain Dar, A.G. Rather, S.Najeeb N.A. Zeerak, Asif B. Shikari, Z.A. Bhat, M.A. Ahanger,S.D. Mir, Mushtaq Ahmad, Shahida Iqbal, Iram Saba and Gazala Hassan
Gene action and standard heterosis over environments in Rice Oryza sativa L.. 2014. Electronic Journal of Plant Breeding, 5 3, 360-370. Retrieved from https://www.ejplantbreeding.org/index.php/EJPB/article/view/26
Issue
Vol 5 No 3 (2014)
Section
Research Article

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.