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Brassica is an important oilseed crop. The genetic basis of plant height, no. of primary branches, no. of pods per plant, no. of pods per raceme, pod length, beak length and 1000 grain weight in brassica lines was estimated through combining ability by using line × tester (5 × 3) analysis. The presence of a significant difference in the means squares of analysis of variance indicated that all the genotypes genetically differed from each other for investigated traits. The super value of Ϭ²sca over Ϭ²gca revealed the presence of non-additive gene action for all studied parameters. The results for the gca effect concluded that BN3, BN4, and BC27 had higher gca effect for many traits. Lines exhibited greater contribution then testers for every trait except beak length. The F1 hybrid of BN3 × BC27 was superiors in sca effect for many of the investigated traits. The other best performing hybrids were BN3 × BC7, BN4 × BC27, BCAC × BC7, BCAC × BC27, BCAA × BC7, BCAA× BC27, and BC44 × BC7. This research described the importance of the non-additive type of gene action in brassica and suggested its use in the breeding programs for evaluating genetic variations. The study presented useful information about gene action for various yield controlling traits. Thus, concluded that the use of lines having superior gca and sca in the yield improvement plans for brassica will help in obtaining improved cultivars.

#Brassica #Gene action #General combining ability #Specific combining ability #Line × tester

GENE ACTION AND INHERITANCE OF RESISTANCE TO RHIZOCTONIA SOLANI AND PYTHIUM ULTIMUM IN COTTON SEEDLINGS

Abstract:

Gene Action and Inheritance of Resistance to Rhizoctonia solani and Pythium ultimum in Cotton Seedlings (May, 1986) Maxwell Amlai Todi Poswal, B.Sc. (Agric.) Ahmadu Bello University, Zaria, Nigeria M.Sc. (Crop Protection) Ahmadu Bello University, Zaria, Nigeria. Chairman of Advisory…

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#COTTON SEEDLINGS #GENE ACTION #GENE ACTION AND INHERITANCE OF RESISTANCE TO RHIZOCTONIA SOLANI AND PYTHIUM ULTIMUM IN COTTON SEEDLINGS #PYTHIUM ULTIMUM #RHIZOCTONIA SOLANI

Babar Usman, Munir Ahmad, Mozammil Hussain, Mohsin Niaz, Mudassar Abbas, Umair Khalid, Gul Nawaz, Zhao Neng Department of Plant Breeding and Genetics, PMAS-Arid Agriculture University, Rawalpindi, Pakistan Maize, Sorghum, Millet & Fodder Program, Crop Sciences Institute, NARC, Pakistan College of Agriculture, Guangxi University, Nanning, P.R. China State Key Laboratory for Conservation and Utilization of Subtropical Agro Bioresources, Guangxi University, Nanning, P.R. China Key words: Gene action, Dominance, Epistasis, Heritability, Variance

The present study was carried out to determine the type of gene action to design the efficient breeding program which helps to generate high yielding and adaptive cultivars. The experiment was conducted at National Agricultural Research Centre Islamabad (Pakistan) and experimental material comprised of 30 crosses derived from 10 inbred lines and three testers of maize. The evaluation trial was laid out using Randomized complete block design with three replications. Data were collected on plant height, flag leaf area, ear leaf area, chlorophyll content, kernel rows per ear, 1000 kernel weight and seed depth.

#Gene action #Dominance #Epistasis #Heritability #Variance

By: Ali Ahmed Sial, Tariq Manzoor Khan, Amir Shakeel, Sohail Kamaran, Alam Zeb

Present study was conducted during 2013-14 at University of Agricultural, Faisalabad, Pakistan to Fig. out gene action and heritability of lint yield and quality traits in upland cotton. Parental genotypes viz COKER-3113, CRIS-9, BT-122 and CRS-456 were crossed following 4×4 diallelmating design. Genotypes showed significant variations for plant height, monopodia plant-1, sympodia plant-1, bolls sympodia-1, bolls plant-1, seed cotton yield plant-1, fiber length, fiber fineness and fiber strength

#conventional breeding #Heritability #Response #Selection #Gene action

By: Mildred Ochwo-Ssemakula Abstract Stalk eyed flies (D. longicornis and D. apicalis) are pests of economic importance on rice. Of the two species of stalk- eyed fly, D. longicornis is the most pr…

#Quantitative inheritance #combining ability #Gene action #Rice.

Charles Ganteh Weelar, Jimmy Lamo, Michael Hilary Otim, Bruno Awio, Mildred Ochwo-Ssemakula School of Agricultural Sciences, Makerere University, Kampala, Uganda National Crops Resources Research Institute, Kampala, Uganda Key words: Quantitative inheritance, combining ability, Gene action, Rice.

Abstract

Stalk eyed flies (D. longicornis and D. apicalis) are pests of economic importance on rice. Of the two species of stalk- eyed fly, D. longicornis is the most prevalent and destructive. To determine the mode of inheritance for resistance to the stalk-eyed fly in rice in Uganda, crosses were made among eight parental lines (NERICA4, TXD306, K85, NM7-22-11-B-P-1-1, NERICA1, NERICA6, NAMCHE2 and PAKISTAN) selected on the basis of their response to the stalk-eyed fly, high yield and early maturity. Of the eight, four genotypes [NERICA4, TXD306, and NM7-22-11-B-P-1-1 and K85], exhibited lower levels of deadheart occurrence and were crossed using the North Carolina II mating design with four susceptible genotypes [NERICA1 and NERICA6, PAKISTAN, and NAMCHE2]. Studies on combining abilities were conducted on 16 F1 hybrids along with the eight parents. Narrow sense coefficients of genetic determination (NSCGD) were low to moderate (0.09 – 0.33) and broad sense coefficients of genetic determination (BSCGD) were moderate to high (0.38 – 0.89) for traits studied. Both GCA and SCA effects were significant for percentage of deadhearts. However, Baker’s ratio was less than 0.5 (0.37) for deadhearts, indicating that both additive and non-additive gene effects were involved in resistance to the stalkeyed fly, although non-additive gene effects were more important. NERICA4 andK85 were found to be good general combiners for increasing resistance. The crosses Pakistan × TXD306 and NERICA1× NM7-22-11-B-P-1-1 were identified as promising lines for advancement.

Get the original articles in Source: Mode of inheritance of resistance to the stalk-eyed fly (Diopsis longicornis) in rice

Journal Name: International Journal of Agronomy and Agricultural Research (IJAAR)

Published By: International Network for Natural Sciences

#Quantitative inheritance #combining ability #Gene action #ricette

The F1 hybrids along with the parents were evaluated in field for genetic analysis to determine the nature and magnitude of genetic variances and heritability estimates a in maize (Zea mays L.) in 2012 using RCBD with three replications. Results analysis of variance showed, based upon the results of tests, simple genetic model was fully adequate for analyzing the data set for all traits except plant height.

#Genetic parameters #Gene action #Zea mays