Madhu BalaManjinder Singh2019-04-222019-04-222019http://krishikosh.egranth.ac.in/handle/1/5810100803The present investigations „Studies on morphological variability and DUS characterization in tuberose (Polianthes tuberosa L.)‟ were undertaken in the Department of Floriculture and Landscaping, Punjab Agricultural University, Ludhiana (India) during the year 2017-2018. The experimental material comprised of thirteen genotypes of tuberose viz. Local Single, Bidhan Rajani H-1, Bidhan Rajani H-2, Bidhan Rajani H-3, Phule Rajani, Prajwal, GKT-C4 and Arka Nirantara of single type and Pearl Double, Suvasini, Pune Double, Hyderabad Double and Vaibhav of double type. The experiment was replicated thrice using randomized block design (RBD). The observations on various growth and flowering parameters were recorded and data was subjected to statistical analysis. The results of the study revealed that for single type genotypes, plant height (53.66 cm), flowering duration (26.66 days), weight of floret per spike (52.32 g), diameter of bulbs (3.67 cm) and bulblets (1.87 cm), weight of bulblet (3.34 g) and vase life (6.95 days) was observed maximum in cv. „Prajwal‟, while cv. „Bidhan Rajani H-2‟ exhibited minimum days to spike emergence (65.8 days) and the maximum number of bulbs per clump (3.89). The spike length was the maximum (86.46 cm) in cv. „Bidhan Rajani H-1‟. In double type genotypes, the maximum plant height (43.92 cm), spike length (70.26 cm), number of florets per spike (56.86), diameter of floret (3.86 cm), weight of floret per spike (2.62 g) and vase life (7.37 days) was recorded in „Suvasini‟ while „Vaibhav‟ was earliest to spike emergence (76.73 days) and had maximum number of leaves per plant (52.14), flowering duration (26.40 days), number of bulbs per clump (2.06), number of bulblets per clump (22.8), diameter of bulbs (3.57 cm), diameter of bulblets (2.17 cm) and weight of bulblets (5.41 g). The morphological characterization of these genotypes showed differences for colour, variegation, length and breadth of leaf, length of bud and length, type and diameter of flower. The colour of bud and flower recorded no variation and were white in all genotypes. The shape of flower, rows of tepals, inflorescence length, number of flowers per inflorescence, days taken for flowering also exhibited variations among different genotypes when compared as per DUS 80 days. Among all the genotypes „Prajwal‟ and „Suvasini‟ performed best in all the growth, flowering and yield parameters under Punjab conditions for single and double types, respectively. All the varieties under study showed morphological variation with respect to different parameters as per DUS guidelines.ennullThesis