Abstract

Tomato is a winter vegetable in Bangladesh. The production of tomato in summer is limited because of high temperature, heavy rainfall and severe infestation of diseases. Recently Bangladesh Agricultural Research Inst. developed two varieties of tomato that can set fruits in summer with the application of Tomatotone (Parachloro phenoxy aceticacid) but, the yield is poor (24 t/ha). Hence, a program was initiated to develop hybrid tomatoes that can set fruits at high temperature without Tomatotone. In 1995 winter season half dialel crosses were made between seven selected inbred lines. Hybrid seeds of all crosses were collected and tested in 1996 summer season along with the parents. All the hybrids gave higher yield over the parents. The hybrid line TM0832 was the highest yielder and produced 424.7% higher yield over the better parent. Selected hybrids were further put into regional yield trial in Summer 1997 with the control variety BARI Tomato-4. TM0832 performed better in all the locations and produced 146.45% higher yield over the control. The distinguishing morphological characters of the hybrids are dwarf plants with less foliage coverage and profuse bearing (70–75 fruits/plant). Fruits of TM0832 matured in 60–65 days after transplanting and harvesting continued for a month. Fruits are globose, medium in size, solid and developed uniform red colour at maturity. Fruits have shelf life of 20 days at an ambient summer environment. The plants showed high degree of tolerance to bacterial wilt.

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