PJB-2020-333
EXPLORING THE COMBINING ABILITY EFFECTS OF RAPESEED (BRASSICA NAPUS L.) GENOTYPES FOR AGRO-MORPHOLOGICAL CHARACTERS UNDER WATER STRESS CONDITION
SAJID HUSSAIN RAO
Abstract
Water stress is one of major constrains for various field crop production including rapeseed. The development of water stress tolerant rapeseed varieties is believed as an efficient and effective strategy to face the challenge. However, to carry out genetic analysis, such as combining ability further helps to evolve high yielding crop varieties for stress environment. Therefore, an experiment was conducted for identifying best water stress tolerant and high yielding genotypes through genetic analysis. In this context, six high yielding water stress tolerant rapeseed genotypes were hybridized for more genetic analysis. The combining ability effects were determined after 6 × 6 half diallel mating design under water stress conditions at two treatments including control under randomized complete block design in factorial arrangement with three replications. The treatments were (i) control (4 irrigations; at four main stages i.e. stem growth, flowering, silique formation and maturity) and (ii) water stress at maturity (3 irrigations; at three main stages i.e. stem growth, flowering and silique formation). The variances of GCA and SCA were significant differences (P≤0.05) for majority of the studied traits, including seed yield plant-1 under normal and water stress conditions, inferring the additive and non-additive genes regulated most of the characteristics studied. Three parents, such as Rainbow, Rohi Sarson and NARC Sarson, remained exceptional by giving higher GCA effects for most of the traits investigated. Not only under controlled conditions but also under water stress conditions, so these three parents may prove excellent in improving rapeseed crops, particularly with regards to water stress conditions. Regarding the SCA results the crosses Con-I × Rohi Sarson, Hyola-401 × Rainbow and Rainbow × Rohi Sarson showed desirable SCA effects for all characters under normal and water stress conditions, thus may be preferred in future rapeseed stress breeding programs.
To Cite this article:
Download
