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An experiment was conducted to evaluate the responses of various concentrations of NAA (25, 50, 75 ppm) and Pseudomonas inoculum on growth, yield and some biochemical parameters of sesame (Sesamum indicum L. var. BARI Til-4). Results revealed that application of NAA treatments and Pseudomonas inoculum reduced plant height non-significantly. Significant result was recorded on number of branches per plants from 50 ppm NAA treated plants. Plants treated with 75 ppm NAA produced maximum number of leaves, fresh and dry weight of leaves and roots, leaf area per plant and specific leaf weight whereas significant variation was found on leaf area. Seeds treated with Pseudomonas inoculum exhibited maximum shoot and root ratio which showed non-significant variation with the results of NAA treated plants. Yield contributing parameters viz., number of pods per plant, fresh and dry weight of pods per plant, 1000-seed weight were recorded maximum from 75 ppm NAA which were statistically similar to control. Maximum length of pod and number of seeds per pod were also recorded from 75 ppm NAA treated plants which eventually produced 32.54% higher yield than control. Harvest index was significantly influenced by all the treatments. Foliar NAA treatments and Pseudomonas inoculum had stimulatory effects on pigment contents of fresh leaves at vegetative stage where, Pseudomonas inoculum treated plants produced significantly higher chlorophyll a and carotenoids content than control. Significantly higher protein content of fresh leaves and seeds were also recorded from 75 ppm NAA treated plants. Out of four treatments, 75 ppm NAA produced better responses in most of the parameters. Introduction Sesame (Sesamum indicum L.) is one of the ancient oilseed crops cultivated from tropical to temperate regions of the world under the family Pedaliaceae. It occupies fifth position as an oil crop in Bangladesh and plays vital role in human diet having high per cent of oil (42 45), protein (20) and carbohydrate (14.20). Seed contains 47% oleic, 39% linoleic acid and rich in omega 6 fatty acid (BARI 1998). Currently the annual demand of oil seeds is approximately 1.4 million metric ton whereas the production at national level is only 0.4 million metric ton (Azad et al. 2017). Acute shortage of this edible oil has been prevailing in Bangladesh during the last several decades and about 70% of this shortage has been met through imports, using a huge amount of foreign exchange every year. To meet the demand of oilseeds, Bangladesh needs to improve cultivation of oilseed crops for attaining self-sufficiency in the country. In addition, the yield of sesame is very low in the country due to lack of proper management practices (Rahman et al. 1994). The yield of sesame could be increased by using numerous improved technologies and practices where, application of growth regulators and plant growth promoting bacteria is considered as the easiest ways for such an attempt. Some investigations have showed that naphthalene acetic acid (NAA) had stimulatory effect on different oil seeds crops including sesame (Govindan et al. 2000, Haque 2005, Behera 2015, *Author for correspondence: <adam_du04@yahoo.com>.

bangladesh journal of botany

Responses of naphthalene acetic acid and Pseudomonas inoculum on growth, yield and some biochemical parameters of sesame (Sesamum indicum L. var. BARI TIL-4)