Viveka Nand Yadav, Mahak Singh, RK Yadav, HC Singh, Alok Kumar Maurya, Anil Kumar Singh and Sri Govind Singh
An experiment consisting twenty one single crosses derived from 7 x7 diallel cross and seven parents of Indian mustard was conducted at Oilseed research Farm of C. S. Azad Univ. of Ag. & Tech., Kanpur during Rabi 2015-16. Each parent and F1s
was sown in two rows of 5 meter long spaced at 45x10 cm between rows and plants respectively during the month of December in three replications. The data were recorded on 5 randomly selected plants for days to 50% flowering, days to maturity, plant height (cm), number of primary branches per plant, number of secondary branches per plant, number of siliquae per plant, number of seeds per siliqua, 1000-seed weight (g), biological yield per plant (g), harvest index (%), oil content (%) and seed yield per plant (g). The analysis of variance showed highly significant differences among parents and crosses revealing sufficient quantity of variations in the genetic materials used in study. The Analysis of Variance for Combining Ability revealed highly significant differences both for GCA and SCA for all the characters except harvest index for GCA and days to maturity and harvest index based on SCA. Higher the value for variances due to SCA as compared with corresponding variances due to GCA for all the characters except days to maturity & 1000 seed weight indicated the preponderance role of non -additive gene action for controlling the characters. Parents Kranti, RLM-198, RGN-291 and Vardan were noted as good general combiner for majority of the characters. It showed the consistency of fixable additive and/or additive X additive gene action. The crosses selected on the basis of per se
performance and desirable significant SCA effects for seed yield per plant and associated characters showed that cross combinations namely; Kranti x NRCHB-101, Kranti x Ashirvad, NRCHB-101 x RLM-198, NRCHB-101 x RGN-291, RLM-198 x Ashirvad, RGN-291 xAshirvad, RH-30 x Ashirvad and Vardan x Ashirvad were the best specific combiners for seed yield per plant. A perusal of these crosses showed that the parents involved in these combinations had high x low and Low x Low GCA status. Kranti x NRCHB-101, Kranti x Ashirvad, NRCHB-101 x RLM-198, NRCHB-101 x RGN-291, NRCHB-101 x RH-30 and RH-30 x Ashirvad also showed positive and significant economic heterosis for seed yield per plant. All these crosses can be further exploited for yield and its attributes through appropriate selection procedures for harvesting of the desirable transgressive segregates in advanced generations.
Viveka Nand Yadav, Mahak Singh, RK Yadav, HC Singh, Alok Kumar Maurya, Anil Kumar Singh and Sri Govind Singh. Genetics of seed yield in Indian mustard [Brassica juncea (L.) Czern. & Coss.] under late sown environment. J Pharmacogn Phytochem 2020;9(4):249-254.