True spiral angle in cotton of <i>gossypium arboreum</i>

Moharir, A. V.; Vijayraghavan, K.

doi:10.1002/app.1993.070481021

Cited by 5 publications

(14 citation statements)

References 12 publications

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“…A relative orientation/crystallinity index with respect to ramie does not yield any significant correlation with the Hermans factor, ␣ m , and bundle tenacity. The correlations of the Hermans factor and ␣ m are far better with the true spiral angle (␣ m -) 42,43 than with the other two measures of true spiral angles (40%-) and (50%-). 42,43 The correlations of ␣ m with the 40 and 50% X-ray angles are again equally significant and so also with the true spiral angles (40%-) and (␣ m -).…”

Section: Resultsmentioning

confidence: 83%

“…The correlations of the Hermans factor and ␣ m are far better with the true spiral angle (␣ m -) 42,43 than with the other two measures of true spiral angles (40%-) and (50%-). 42,43 The correlations of ␣ m with the 40 and 50% X-ray angles are again equally significant and so also with the true spiral angles (40%-) and (␣ m -). This indicates that ␣ m and the true spiral angle (␣ m -) determine the spirality of cellulose crystallites in native cotton more faithfully than do the 40 and 50% X-ray angles and the true spiral angles deduced from them.…”

Section: Resultsmentioning

confidence: 83%

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Stability of X‐ray cellulose crystallite orientation parameters in native cotton with change of location and year of growth

Moharir

Langenhove

Nimmen

et al. 1999

J. Appl. Polym. Sci.

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In this article, data on cellulose crystallite orientation parameters measured in terms of the Hermans orientation factor, average angle of orientation (␣ m ), and 40, 50, and 75% X-ray angles in respect to the same 13 cotton cultivars grown at different agroclimatic locations and in different crop years in India are presented and discussed. It was observed that whereas the average values of the X-ray orientation parameters are different for different varieties they remain practically invariant within individual varieties with change of the location of growth. The orientation parameters, therefore, appear to be genetic in origin and independent of the agroclimatic conditions of growth. It is believed that these results can be suitably exploited by cotton breeders in evolving varieties with an increased strength of fibers.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 83%

Stability of X‐ray cellulose crystallite orientation parameters in native cotton with change of location and year of growth

Moharir

Langenhove

Nimmen

et al. 1999

J. Appl. Polym. Sci.

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“…The 40 and 50% X‐ray angles show negative correlations with all three tenacity measures. Although these correlations are not significant, their trend has been reported in several earlier publications 6, 10, 11, 21, 22…”

Section: Resultsmentioning

confidence: 99%

“…Although these correlations are not significant, their trend has been reported in several earlier publications. 6,10,11,21,22…”

Section: Resultsmentioning

confidence: 99%

“…Some such areas are the rate and amount of cellulose synthesis6, 7, 15, 16 in cotton varieties and species, and the orientation and disposition of crystalline cellulose to the fiber axis within individual diurnal secondary layers of developing cotton fiber, which are complicated by the generation of reversal extinction bands17, 18 and convolution twists 18, 19. There has been debate over the constancy or variation of this orientation among varieties and species of cotton 20–22…”

Section: Introductionmentioning

confidence: 99%

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Rate and amount of cellulose synthesis in developing fibers of Gossypium arboreum and Gossypium hirsutum cotton

Moharir¹,

Bodas²,

Vashisth³

2003

J of Applied Polymer Sci

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Cotton fiber cellulose synthesis and cellulose content at various post anthesis maturity stages of boll' development were studied in sixteen cotton varieties of Gossypium arboreum and Gossypium hirsutum species, grown in the 2001 crop year in New Delhi, under identical agro-climatic conditions. Cellulose content was estimated using Updegraff's method. Field matured seed cotton was harvested at the end of the crop season and ginned fibers were subjected to physical testing in an AFIS-HVI facility. X-ray orientation parameters were computed from the normalized azimuthal diffracted X-ray intensity scans of (002) reflections. Simple correlations were worked out among various parameters measured. Cotton varieties were indeed observed to vary in their synthesized cellulose content and such differences are genetically inherent.Varieties of Gossypium arboreum synthesized less cellulose compared to the Gossypium hirsutum cultivars, although the rate of cellulose synthesis within each variety, regardless of species, was observed to be practically uniform at any five-day interval. The range of variation in cellulose content was observed to be more than 260%. Uniformity ratio, HVI tenacity and average leaf area were positively correlated with cellulose content. X-ray angles of 40% and 50% correlated significantly with a negative cellulose content, (thereby) indicating an increased orientation of cellulose crystallites to the fiber axis, with a greater amount of cellulose synthesized.

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True‐spiral angles in diploid and tetraploid native cotton fibers grown at different locations

Moharir

Langenhove

Louwagie

et al. 1998

J. Appl. Polym. Sci.

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ABSTRACT:In this article, data on true-spiral angles in respect to the same 12 cotton varieties grown at different agroclimatic locations and in different crop years in India are presented and discussed. It has been concluded that the values of true-spiral angles are different for different varieties but within a variety remain practically invariant irrespective of the location and environmental conditions of growth. The parameter therefore appears to be genetic in origin. It is believed that this information can be suitably exploited by progressive cotton breeders for evolving high-strength cottons, keeping in view the demand of the modern cotton processing technologies.

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True spiral angle in cotton of gossypium arboreum

Cited by 5 publications

References 12 publications

Stability of X‐ray cellulose crystallite orientation parameters in native cotton with change of location and year of growth

Stability of X‐ray cellulose crystallite orientation parameters in native cotton with change of location and year of growth

Rate and amount of cellulose synthesis in developing fibers of Gossypium arboreum and Gossypium hirsutum cotton

True‐spiral angles in diploid and tetraploid native cotton fibers grown at different locations

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