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Contribution of Morpho-physiological Traits on Yield in Lentil

M. Monjurul Alam Mondal, PhD
Principal Scientific Officer
Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Experiments were performed under tropical condition with five promising lentil mutants, LM-149, LM-417, LM-504, LM-507, LM-1018 and L-5 to evaluate some morpho-physiological features and its impact on seed yield. The growth rate was very slow during the vegetative phase in all the genotypes due to a relatively smaller portion of dry matter production before flower initiation and bulk of it after anthesis. The maximum growth rate was observed at late flowering stage (60-70 days after sowing) in most of the genotypes. Results indicated that genotype improvement efforts have achieved higher seed yield by higher growth rate at early growth stages and better assimilate partitioning to economic yield, and bushy plants are unlikely to improve harvest index in lentil. Two mutants, LM-507 and LM-1018 had medium plant stature with moderate biomass production capacity and improved harvest index thereby increased yield. This information may be used in future plant breeding programme.

Keywords: Growth, Lentil, Mutants, Nitrate reductase, Yield

Location: Experimental farm, Bangladesh Institute of Nuclear Agriculture, Mymensingh

Start Date: 03-11-2009

End Date: 21-03-2010

Program Area: Crop-Soil-Water Management

Commodity: Lentil

Objectives:

To study the physiological, biochemical and morphological relationship with seed yield in advanced lentil mutant lines.

Methodology:

The experiments were conducted at research farm of Bangladesh Institute of Nuclear Agriculture, Mymensingh during November to March 2009 and 2010. The experiment was laid out in a randomized complete block design with three replicates. The unit plot size was 2.5 m × 2.0 m with plant spacing of 30 cm × 5-6 cm. The tested mutants were LM-149, LM-417, LM-504, LM-507, LM-1018 and L-5. Recommended intercultural practices were followed in both years. To study ontogenetic growth characteristics, a total of six harvests were made. Ten plants were randomly sampled for growth parameters from 40 DAS and continued at an interval of 10 days up to 90 DAS. The plants were separated into roots, stems, leaves and pods, and the corresponding dry weights were recorded after oven drying at 80 ± 2⁰C for 72 hours. The growth analysis was carried out following the formulae of Hunt (1978). Chlorophyll content and nitrate reductase activity in leaves, leg-haemoglubin content in nodule and photosynthesis rate in leaves were determined at 65-70 DAS (flowering and fruiting stages). Leaf area of each sample was measured at 90 DAS. Leaf chlorophyll was determined following the method of Yoshida et al. (1976). Leaf photosynthesis was measured by photosynthesis meter (LI 6400XT, LI-COR Biosciences, USA). Nitrate reductase activity was determined following the methods of Stewart and Orebamjo (1979). Leg-haemoglubin was determined by the Cyanmethaemoglobin method (Schifftmann and Lobel, 1970). Grain protein per cent was estimated by Micro-Kjeldhal method (AOAC, 1980). The yield contributing characters were recorded at harvest from ten competitive plants of each plot. The seed yield was recorded from five rows of each plot (1.5 m × 2.0 m) and converted into seed yield ha^-1. All data were analyzed statistically.

Source of Information: Australian Journal of Crop Science 7(8):1167-1172 (2013)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In addition to superior characters for yield components, a high yielding lentil genotype should posses a relatively higher growth rate at early growth stages and having capacity to better dry matter partitioning to economic yield. Among the mutants/cultivar, ML-1018 produced the highest seed yield ha^-1 along with HI and was the earliest in maturity.

Knowledge Management: Journal