EVALUATION OF EXPERIMENTAL HYBRIDS OF OKRA (Abelmoschus esculentus Moench.)

Abstract

An experiment was conducted at the research field of the Department of Genetics and Plant Breeding, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur, under the supervision of Genetics and Plant Breeding Department, (HSTU), Dinajpur during March, 2017 to June, 2017. The experiment was set in Randomized Complete block Design (RCBD). The major objectives of the experiment were to study heritability and genetic advance to evaluate the experimental hybrids. Two check variety occupying accession number 960 (Green finger, Lal teer seed), 1 (BARI dherosh-1) and eight F1 hybrids occupying accession number 6 (Green finger × Komol), 9 (Local, Rangpur × Komol), 10 (Local, Rangpur × Green finger), 14 (Shakti × Green finger), 15 (Shakti × Local, Rangpur), 19 (R&D seg × JK haritha), 20 (AMO-215 × JK haritha), 21 (AMO-215 × JK haritha) were used in the experiment. The study revealed a wide range of genetic variation among the accession number for all the characters studied. Highest plant height, no. of leaves/plant, fruit/plant, weight of fruit, length of fruit, diameter of fruit, seed/pod and 100 seed weight were found among the accession number in the study. The highest observation of fruit/plant (45.22), weight of fruit (150.44 g), length of fruit (17.80 cm), diameter of fruit (6.84 cm) and 100 seed weight (8.33 g) was recorded in accession number 21. The heritability estimation varied from 27.657%-97.481%. High heritability was found in number of leaves at 100 days (97.481%). The highest genetic advance was recorded in the plant height at 100 days (22.392). Acc. No. 21 showed the highest heterobeltiosis, average heterosis and standard heterosis in fruit/plant, fruit length and no.of leaves/plant, which is desirable for the exploitation of a commercial hybrid. Acc. No. 14 showed the highest heterosis in the weight of fruit and diameter of fruit in all the types of heterosis. Acc. No. 15 showed significant positive heterosis over better parent and mid parent in 100 seed weight. Acc. No. 10 showed significant haterosis over mid parent and check variety but Acc. No. 9 showed the highest heterobeltiosis in the character seeds/pod. Plant height showed significant positive correlation with no. of leaves/plant, fruit weight, and seed/fruit. fruit length, fruit diameter, 100 seed weight also showed positive correlation with plant height. Fruits/ plant showed significant positive correlation coefficients with fruit weight, fruit diameter, 100 seed weight in both genotypic and phenotypic correlation coefficients. Increase in fruits/ plant increased fruit weight, fruit length, fruit diameter, seeds/ fruit, 100 seed weight. So, these characters transpired as the yield contributing characters. On the other hand 1st flower initiation days showed significant positive correlation with 50% flower initiation days. So, the breeder should take into consideration of these characters for commercial exploitation of hybrid variety in okra. Acc. No. 21, 14, 10, 9 may be exploited as commercial F1 hybrids. It may be concluded that the accession number 21 proved itself as the topmost promising hybrid variety and can be tested in different agro-ecological zones in Bangladesh.