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Floral Morphology and Seed Yield in Two Indigofera Spp. as Affected by Shoot Clipping

Dr. A. K. M. Golam Sarwar
Professor
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh 2202,Bangladesh

Abstract/ Executive Summary:

An experiment was carried out to know the effect of shoot clipping on floral morphology and seed yield in two Indigofera spp. viz. I. tinctoria L. and I. suffruticosa Mill. All parts of shoot including the main stem were clipped at 60 cm height from the base at 120 days after sowing (DAS). At 120 DAS, I. tinctoria already exhibited 1^st flowering while I. suffruticosa showed no flowering. Shoot clipping had significant effect on almost all floral morphological features in two Indigofera spp. Flower raceme⁻¹ and pod raceme⁻¹ were fewer in clipped plant than in unclipped one. Shoot clipping altered the size of different floral parts to a great extent. The seed yield was decreased in clipped plant.

Keywords: Indigofera spp., Shoot clipping, Floral morphology, Seed yield

Location: Mymensingh

Start Date: 00-04-2011

End Date: 00-12-2011

Program Area: Seed Technology

Commodity: Indigofera

Objectives:

To know the effect of shoot clipping on floral morphology and seed yield in two Indigofera spp. viz. I. tinctoria L. and I. suffruticosa Mill.

Methodology:

The experiment was conducted at the Field, and Plant Morphology Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, during the period from April to December, 2011. The experiment was carried out following a randomized complete block design (RCBD) with three replications. The seeds of two Indigofera spp. viz. I. tinctoria and I. suffruticosa, were sown at 2–3 cm depth in the rows 30 cm apart. Emergence of seedling commenced at 4–5 days after sowing (DAS). Seedlings were thinned to maintain 15 cm distance between two adjacent seedlings. Different intercultural operations were done as and when necessary. It was found that shoot clipping at 60 cm height at 120 DAS resulted in higher biomass yield (Kabir, 2003; Rokonuzzaman, 2003). Therefore, the shoot clipping was done at 120 DAS where all the shoots of plants were clipped at 60 cm height from the base to maximize biomass yield for dye production. Final harvesting was done at 240 DAS. Morphological features (colour, size and shape) of different floral parts (corolla, androecium and gynoecium), pod and seed were studied. Quantitative data were recorded from randomly selected at least 5 individual plants of two species. Volume of the pod was determined following Khan et al. (2008). Collected data were statistically analyzed by using the computer software program MSTAT-C and the difference between means was adjudged by Duncan’s New Multiple Range Test (DMRT).

Source of Information: J. Bangladesh Agril. Univ. 11(1): 61–66, 2013,ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The pods raceme^-1 was significantly smaller in I. tinctoria than in I. suffruticosa both in clipping and control conditions, although shoot clipping increases fruit setting percentage in both the species .Therefore, clipping in this experiment produced fewer flowers and pods and finally lowered the seed yield in I. tinctoria. It can be concluded that shoot clipping adversely affected size of flower and pod and seed yield in both of the two Indigofera spp.

Knowledge Management: Journal