TY - BOOK AU - JAGJIWAN Singh TI - Estimation of combining ability and heterosis through the use of male sterile lines in tomato (Lycopersicon esculentum Mill) U1 - 635.642 2 J20E PY - 1999/// PB - Ludhiana KW - TOMATOES -- GENETICS KW - HETBREEDING KW - TOMATO KW - TOMATO BREEDING KW - VEGETABLE N2 - The investigation was carried out at the Vegetable Research Farm of the Punjab Agricultural University,Ludhiana dunng 1998-99 to assess the combining ability and heterosis by line x tester analysis For the hybrids mean squares were found to be significant ER -