M. M. ALAM PATWARY
Senior Scientific Officer
ARS, Bangladesh Agricultural Research Institute (BARI), Pahartali Chittagong
M. MIZANUR RAHMAN
Professor
Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRU), Gazipur
SHAHABUDDIN AHMAD
Chief Scientific Officer
HRC, BARI, Gazipur
M. A. KHALEQUE MIAH
Professor, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRU), Gazipur
HAIMONTI BARUA
Scientific Officer (T&C)
ARS, BARI, Pahartali, Chittagong, Bangladesh.
Tomato, Heterosis, Heat tolerant tomato, Summer.
ARS, Bangladesh Agricultural Research Institute (BARI), Pahartali Chittagong
Variety and Species
The experiment was conducted at the experimental farm of Olericulture Division, Horticulture Research Centre (HRC), Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur during the month of May to October 2008. The average minimum and maximum temperature during the crop period was 25.220C and 31.880C, respectively. A diallel cross of 8 x 8 excluding reciprocals were constructed from the eight heat tolerant parental lines viz., P1, P2, P3, P4, P5, P6, P7, and P8 collected from HRC, BARI, Gazipur. The basic seeds of the 8 x 8 halfdiallel mating were produced in the vegetable research field, HRC, BARI during October 2007 to March 2008. Seeds of the eight selfed parents and their 28 F1 hybrids were sown in seed bed on 5 May 2008. At the age of 30 days, seedlings were transplanted in the main experimental plots. The experiment was set up in a randomized complete block design (RCBD) with three replications. Thirty-six genotypes (28 F1s + 8 parents) of tomato were considered as the 36 treatments of the experiment. The experimental plots were covered by transparent polythene with minimum interruption of photosynthesis. The polytunnel was 2.3 meter wide having two 1.0 meter wide bed with 30 cm drain in between, which serves as irrigation channel. Chemical fertilizers @ of 550 kg urea, 450 kg TSP, 250 kg MoP, 120 kg Gypsum, 2 kg boron, and 10 tons cowdung per hectare were applied. Half of the cowdung and the entire amount of TSP, Gypsum, and Boron were applied during final land preparation. The pits were prepared one week before planting. The remaining cowdung and 1 /3 of MoP were applied at that time. Top dressings were done in three equal installments at 10, 25, and 40 days after transplanting to apply the entire urea and rest 2/3 of MoP. Weeding and mulching were done followed by top-dressing and irrigation at 15 days interval. Data on days to 50% flowering, flowers per cluster, viable pollens, fruit set (%), fruited cluster/plant, fruits/plant, fruit weight (g), fruit yield/plant (g), viable pollens, fruit length (cm), fruit diameter (cm), branches/plant, plant height (cm), seeds/fruit, 1000-seed weight, TSS, shelf life, locules/fruit, fruit firmness and fruit flesh thickness were recorded. All the recorded quantitative data were subjected to ANOVA. The significance of increase or decrease in F1 hybrids over their corresponding mid parent and better parent were tested by comparing their means with the help of appropriate standard error values in percentage. For estimation of heterosis in each character the mean values of the 28 F1s have been compared with better parent (BP) for heterobeltiosis.
Bangladesh J. Agril. Res. 38(3): 531-544, September 2013 ISSN 0258-7122
Journal