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ThesisItem Open Access MORPHOLOGICAL CHARACTERIZATION OF CITRUS ROOTSTOCKS(Punjab Agricultural University, Ludhiana, 2013) Harjeet SinghABSTRACT The present investigation entitled “Morphological Characterization of Citrus Rootstocks” was carried out during 2012-2013 at New Orchard and College Orchard, Department of Fruit Science, PAU, Ludhiana. The research work was carried out on nine citrus rootstocks. Among them three rootstocks having different strains were Rough lemon (Citrus jambhiri), Trifoliate (Poncirus trifoliata) and Rangpur lime (Citrus limonia) and six individual other rootstocks viz., Cleopatra (Citrus reshni), Pectinifera (Citrus pectinifera), Alemow (Citrus macrophylla), Karna Khatta (Citrus karna), Calamondin (Citrus mitis) and Volkamarina (Citrus volkameriana). Their evaluation was done for characters as per citrus descriptor given by IPGRI. The qualitative trees, leaves, flowers and fruit characters showed little variability within a species. Most of the quantitative trees, leaves, flowers and fruit characters were found statistically significant for all rootstocks. Maximum fruit weight was recorded in Karna Khatta (710 g). Total soluble solids were observed maximum in Flying Dragon (12.10 oBrix) strain of trifoliate while minimum were recorded in Nagpur strain of rough lemon, (5.66 oBrix). The Sohmyndog strain of rough lemon had the highest acidity (5.37 per cent) while minimum was recorded for Flying Dragon strain of trifoliate, being 1.38 per cent. The Brazilian strain of Rangpur lime had the highest seed number (38.0). The X-639 strain of trifoliate, and Brazilian and Texas strains of Rangpur lime were scored as early maturing (October-November) while Trifoliate was scored as late maturing (February-March). Variability analysis was done and Brazilian was most diverse from other strains of rough lemon.