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Morphological Variation in Three Indigofera Spp.

A.B.M.M.M. Khan
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

M.H.K. Howlader
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

A.K.M.A. Prodhan
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

M.M. Rahman
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

M.S.A. Fakir
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

A morphological investigation was carried out in three Indigofera species (Indigofera tinctoria, I. suffruticosa and I. amblyantha) with a view to identifying a set of characteristics for the individual indigo species. Distinct variation exists in stem, leaf, inflorescence, flower, pod and seed character. The species I. tinctoria possesses 5-11 obovate leaflets per leaf, pink flower with larger standard and wings, narrow cylindrical pod (average pod volume 161.1 mm³) with slightly curved tip and cylindrical deep brown large seed (average 1000-seed weight, 5.79 g); I. suffruticosa possesses green stem with patches of reddish colour, 9-17 narrowly oblong leaflets per leaf, crimson flower with large standard and wings, short strongly curved pod (average pod volume 91.1 mm³) and cylindrical dark green small seed (average 1000-seed weight, 3.75 g); and I. amblyantha possesses 13-15 ovate to lanceolate large leaflets per leaf, cerise-violet flower with largest standard and wings, long, thick, straight cylindrical pod (average pod volume 498.0 mm3) and globose greenish yellow medium seed (average 1000-seed weight, 4.72 g).

Keywords: Morphology, Indigo species, Variation

Location: Botanical Garden, Department of Crop Botany, Bangladesh Agricultural University (BAU), Mymensingh,

Start Date: 00-09-2006

End Date: 00-11-2007

Program Area: Variety and Species

Non-commodity: Indigo

Objectives:

1. To provide a set of diagnostic characters for individual Indigofera species.

Methodology:

This study was conducted at Botanical Garden, Department of Crop Botany, Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh during the period of September 2006 to November 2007. The seeds of I. tinctoria and I. suffruticosa were sown in line in plot following Randomised Complete Block Design (RCBD) with four replications. The plot size was 4 m2 (2 m × 2 m) and the spacing was 30 cm × 30 cm. All necessary intercultural operations were done following recommended practices. Detailed morphological features of the three species were studied, both qualitative and quantitative measurements were recorded from randomly selected at least 5 individual samples of each species. The observed data were: i) stem colour, ii) length of rachis of leaf, iii) colour, size (length × breadth i.e., L × B), shape, surface of leaflets, iv) chlorophyll content of 2nd pair leaflets, v) number of leaflets per leaf, vi) colour, size and shape of different floral parts (corolla, androecium, gynoecium), vii) colour, size and shape of pod and seed. Volume of dry matured pod was measured by πr2h where, π = 3.1415, r = radius of the pod and h = length of the pod. The radius of the pod was calculated from mean value of diameter taken from each of base, middle and top of the pod. Length of pod was measured from base of pod to tip of matured ovary. Length of rachis of leaf was measured from base of the leaf to the tip of terminal leaflet. Chlorophyll content of the 2nd pair of leaflets was estimated by chlorophyll meter, SPAD-502 (Konica Minolta Sensing, Inc. Japan) between 10th and 12th fully expanded leaf descending from top of the plant. All the specimens were photographed with a digital camera (Nikon Coolpix E 7600, Nikon Corp., Japan).

Source of Information: J. Agrofor. Environ. 2(1): 1-6, 2008; ISSN 1995-6983

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Knowledge Management: Journal