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test and correlation (two tailed analysis) was applied for the physico-mechanical properties of culm strands in order to correlate the strength (tenacity) and elongation properties of the culm strands.

RESULTS

The major contributions of the present study include the first time description of the fibre properties of the mat sedge (C. pangorei), including anatomical, physical, chemical, and physico-mechanical properties of the fibres. These descriptions provide insights into interesting observations that could be used for interpretation of the strength and tenacity of the fibres and culm strands.

Fibre Anatomy

The anatomy of the culm includes an outer rind region comprised of the epidermis, hypodermis, and varied types of compactly arranged vascular and fibrovascular bundles. The inner core consists of more or less uniform-type vascular bundles sparsely distributed in the ground parenchyma and aerenchyma. Beneath the epidermis, there is a discontinuous patch of sclerified cells (fibrous sheath) that are interrupted by a few sub-epidermal parenchyma cells (Fig. C-F). In view of the association of the fibrous sheath with the vascular bundles, the term fibrovascular bundle has been used. The fibrovascular bundles are compactly arranged in one to two rows towards the periphery of the culm, also referred as rind, and the inner region with sparsely distributed fibrovascular bundles, parenchyma, and large aerenchyma forms the core. The fibrous sheath is present only in the protoxylem pole in four to eight layers, forming a crescent in the vascular bundles of the core region (Fig. E). The rind region shows remarkable differences in the size and frequency of vascular and fibrovascular bundles in all the three regions of the culm (Table 1).

Mean

SD

R (μm)

SD

T (μm)

SD

Rind

10.85

1.93

174.3

20.2

81.26

4.8

2.14

Core

2.5

0.59

283.0

33.1

195

11.18

1.45

Rind

20.2

2.44

189.5

15.8

98

7.23

1.93

Core

3.2

0.74

235.0

25.3

156

15.6

1.50

Rind

23.15

3.39

138.4

17

86.7

6.3

1.59

Core

6.25

1.92

139.0

11.3

122

8.7

1.13

Middle

Upper most (1cm from the tip)

T: Tangential width; R: Radial height

Benazir et al. (2010). “Sedge fibers and strands,” BioResources 5(2), 951-967.

957

Lower most (1 cm from the base)

REGION

Table 1. Frequency, Dimensions, R/T Ratio of Core and Rind Fibro-Vascular

R/T RATIO

Bundles from Three Regions of Cyperus pangorei Culms

CULM

FIBRO-VASCULAR BUNDLES

REGION

FREQUENCY OF BUNDLES

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