Gene effects for yield and yield contributing traits and allelic relationship of white rust resistant genes in Indian mustard [Brassica juncea (L.) Czern & Coss.]
| dc.contributor.advisor | Pant, Usha | |
| dc.contributor.author | Kandpal, Purnima | |
| dc.date.accessioned | 2020-09-07T10:28:24Z | |
| dc.date.available | 2020-09-07T10:28:24Z | |
| dc.date.issued | 2020-08 | |
| dc.description.abstract | Indian mustard (Brassica juncea) is an important rabi oilseed crop which has a distinctive role in human diet as well as in the economy of the country. However, the productivity of mustard is limited due to many biotic and abiotic stresses and of which white rust is the major cause. Therefore, the present investigation entitled “Gene Effects for Yield and Yield Contributing Traits and Allelic Relationship of White Rust Resistant Genes in Indian [ d r a t s u M a e c n u j a c i s s a r B & n r e z C ) . L ( ] . s s o C ” e r u t l u c i r g A f o y t i s r e v i n U t n a P . B . G , C R C B E N t a t u o d e i r r a c s a w7 and Technology, Pantnagar during the year 201 -20 to study the gene effects governing various quantitative and qualitative traits and also to study inheritance and allelic relationship of white rust resistant genes. The experimental material consisted of two separate but related experiments. The material for Experiment-I consisted of five parents out of which Donskaja, PWR-13-8, and EC399301 were white rust resistant while the remaining two, Varuna and PRB-06-5, were susceptible to white rust. These parents were crossed to develop four families viz, Donskaja × Varuna (Family A), PWR-13-8 × Varuna (Family B), PWR-13-8 × PRB-06-5 (Family C), and EC399301 × Varuna (Family D) and each family consisted of six generations (P1, P2, F1, F2, BC1, and BC2) evaluated in Compact Family Block Design with three replications. The data was subjected to generation mean analysis by joint scaling test (Cavalli, 1952) for obtaining the necessary information. In Experiment II, six generations of the aforementioned families along with two more crosses viz., Donskaja × PWR-13-8 and Donskaja × EC399301 with only four generations (P1, P2, F1, and F2) were used in the study and then chi square analysis (Gomez and Gomez, 1984) was done to study the inheritance and allelic relationship of white rust resistant genes. The analysis of variance showed significant variability between families and also within families (i.e. among progenies) for various traits except for plant height, number of primary branches/plant, number of secondary branches/plant, siliquae density, and seed yield/plant. Adequacy test of different models for characters showed that both main effects and epistatic effects were found important in controlling the various traits under study. An epistatic model was adequate for most of the characters in all the four families except for plant height (in Families A, B, C, and D), length of main raceme (Families B and D) and siliquae length (Families B and C). For Family A, the preponderance of interaction effects in number of primary branches, length of main raceme, siliqua on main raceme, number of primary branches/plant, number of secondary branches/plant, test weight, and seed yield/plant was observed. In Family B, for characters like, siliquae on main raceme, siliquae density, test weight, oil content, and glucosinolate content epistatic effect was found. Family C characters such as length of main raceme, siliqua on main raceme, number of seeds/siliqua, siliqua density, and oil content while in Family D characters like siliqua on main raceme, siliqua length, test weight, seed yield/plant, and glucosinolate content displayed epistatic effects. The presence of interaction effects and duplicate epistasis propounds on the probability of obtaining transgressive segregants in the further generations. Given the overall results in this experiment, it is obvious that most of the characters in all the four families were found to be controlled by both fixable (additive and additive × additive epistasis) and non-fixable (dominance, additive × dominance and dominance × dominance) gene effects coupled with duplicate type of epistasis. These findings will thus help in deciding effective selection and breeding strategies to get desired improvement in seed yield and related traits. Results of chi square analysis indicated that the resistant to white rust is controlled by a single dominant gene. This observation was further confirmed by screening of BC1 and BC2 generation where all BC1 plants were found to be resistant and in BC2 the ratio of 1 resistant : 1 susceptible was observed. When crosses between resistant parents from different sources were observed, a segregation ratio of 15:1 (resistant : susceptible) in F2 indicated the involvement of two different genes governing white rust resistance in these sources. Since white rust resistance has been found to be monogenic dominant, introgression breeding programme, will be the most effective breeding strategy. | en_US |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810150956 | |
| dc.keywords | gene effects, yield components, rust diseases, genes, mustard, Brassica juncea | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 155 | en_US |
| dc.publisher | G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand) | en_US |
| dc.research.problem | Mustard | en_US |
| dc.sub | Genetics and Plant Breeding | en_US |
| dc.theme | Genetic Improvement | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Gene effects for yield and yield contributing traits and allelic relationship of white rust resistant genes in Indian mustard [Brassica juncea (L.) Czern & Coss.] | en_US |
| dc.type | Thesis | en_US |