Estimation of morphological and genetical variation in some mango Mangifera indica L varieties using DUS testings norms

Abstract

The experiment entitled Estimation of morphological and genetical variation in some mango (Mangifera indica L.) varieties using DUS testing s norms was carried out in Horticulture Garden of Bihar Agricultural College, Sabour during the year 2015-16 and 2016-17 with the main objectives (1) to study the genetic diversity in mango varieties based on morphological and phenotypic characters and (2) to access the genetic diversity of mango accessions through molecular markers focused on analysis of genetic variability and divergence in mango genotypes. As many as 48 varieties were selected for study. newlineWide range of variability was observed among various morphological traits like plant height (3.45-5.43 m), plant spread (3.18-4.63 m E-W direction and 3.21-4.68 m N-S direction), crown diameter (3.20-4.66 m), trunk circumference (45.03-67.04 cm.), crown height (0.72-1.34 m), canopy volume (23.09-52.95 m3), canopy height (2.99-4.09 m), leaf length (12.15-33.40 cm), leaf width (2.55-10.19 cm) and petiole length (1.90-5.75 cm), inflorescence length (10.24-40.73 cm), inflorescence width (5.73-26.56 cm) and hermaphrodite flower per cent (6.25-30.06 %). A wide range of variability was observed in physical parameters of fruit traits also. The maximum fruit length (14.94 cm) was found in Alfazli, fruit diameter (10.59 cm) in Dholikothi Maldah at par with Alfazli (10.43 cm) and Vanraj (10.27 cm) and fruit weight (598.27 g) in Hathi Jhula, while minimum fruit length (4.68 cm), fruit diameter (4.45 cm) and fruit weight (73.29 g) were noted in Gilas. The highest range of variability was found in fruit weight i.e. 73.29 to 598.27 g among all characters of mango varieties. The wide range of variability was also observed in biochemical traits. Variety Sabri recorded highest TSS (23.49%) at par with Nisar Pasand, Bag Bahar, Rani Pasand, Bombai, Prabhashankar, Kala Pahar, Husnara and Neeludin (23.21 %, 23.07 %, 23.05 %, 22.89 %, 22.88 %, 22.74 %, 22.58 % and 22.58 %). The minimum mean value was obtained in Gilas (12.55 per cent) which showed