ABSTRACT

A pot experiment was conducted at the BARI sub Station, Pabna during the period of February to June, 2016 to evaluate the performance of six summer tomato mutants (CLN 2418, CLN 2443, CLN 2366, CLN 2413, CLN 2026 and J-5) in respect of yield and storage quality. The experiment was conducted in Completely Randomized Design with three replications. The collected data were analyzed statistically and means were adjudged by DMRT at 5% level of probability. Results revealed that mutants, CLN 2418 and CLN 2443 produced the higher fruit yield (1.50-1.55 kg plant-1) with the highest being in CLN 2418 (1.55 kg plant-1) due to its superiority in respect of all yield contributing characters. In contrast, CLN 2026 produced the lowest fruit yield (0.97 kg plant-1). Further, harvesting duration was the highest in CLN 2418 (36 days) and the lowest was in CLN 2443 (30 days). Among the six genotypes, only one CLN 2026 had lesser NR activity (6.95 µmol g-1 fw). The highest reducing sugar (23.33 mg g-1fw), total sugar (76.32 mg g-1 fw) and amino acid (9.92 mg g-1 fw) content in leaf was recorded in CLN 2418. The highest amount of content in leaf was observed in CLN 2418. The study also confirmed that CLN 2418 also showed seven days shelf life when stored in room temperatures without deteriorating the quality in summer season of Bangladesh.
Key words: Tomato, mutants, performance, bio-chemical properties.

Introduction

Tomato (Lycopersicon esculentum Mill.) belongs to the family Solanaceae, is one of the most important popular and nutritious vegetable crops in Bangladesh. It is cultivated in almost all home gardens and also in the field for its adaptability to wide range of soil and climate in Bangladesh. The crop performs better under an average monthly temperature of 20-230C. But commercially, it may grow at temperature ranging from 15-270C (Haque et al., 1999). However, tomato is widely grown in Bangladesh usually in winter season. With the increase of population, the demand of tomato in our country is increasing day by day. The availability of quality summer vegetable in Bangladesh is very limited in number. Now-a-days, tomato is grown both in the winter and summer seasons in Bangladesh. But the production in the summer season is much less than that of winter. There is a great demand for tomato in summer. The present summer cultivated varieties are having low yield potentiality. So it is necessary to develop high yield variety for summer cultivation. In this regard, some research institutes (BARI, BINA and BAU) are trying to develop high yielding genotypes suitable for summer cultivation which need to be assessed morpho-physiologically for getting stable high yielding genotypes. Keeping the above views in mind, the present experiment was designed to evaluate the yield performances and biochemical properties of tomato mutants.

Materials and Methods

A pot experiment was carried out at the pot yard of Bangladesh Agricultural Research Institute substation, Poilanpur, Pabna during the period from February to June 2016. Geographically the experimental area is located at 24075 N latitude and 90050 E longitudes at the elevation of 18 m above the sea level. The soil of the experiment was collected from farm of BARI Substation, Pabna. The experiment consisted of six summer tomato mutants. They were CLN 2418, CLN 2443, CLN 2366, CLN 2026, CLN 2413 and J-5 (check). The experiment was laid out in a Completely Randomized Design (CRD)) with 3 replications. Two seedlings were sown in each pot on 15 March 2016. Finally, they were thinned to one seedling after 20 days of transplanting. Yield and yield contributing characters were recorded from the cultivated mutants of tomato. In addition some biochemical properties such as nitrate reductase activity, reducing sugar, total