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A BIOSYSTEMATIC STUDY OF THE DIGITAR...

WEBSTER, ROBERT DALE.

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A BIOSYSTEMATIC STUDY OF THE DIGITARIA SANGUINALIS COMPLEX IN NORTH AMERICA (POACEAE: PANICEAE).

Record Type:	Electronic resources : Monograph/item
Title/Author:	A BIOSYSTEMATIC STUDY OF THE DIGITARIA SANGUINALIS COMPLEX IN NORTH AMERICA (POACEAE: PANICEAE)./
Author:	WEBSTER, ROBERT DALE.
Description:	167 p.
Notes:	Source: Dissertation Abstracts International, Volume: 42-07, Section: B, page: 2634.
Contained By:	Dissertation Abstracts International42-07B.
Subject:	Agriculture, Range Management. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8128938

A BIOSYSTEMATIC STUDY OF THE DIGITARIA SANGUINALIS COMPLEX IN NORTH AMERICA (POACEAE: PANICEAE).
WEBSTER, ROBERT DALE.

A BIOSYSTEMATIC STUDY OF THE DIGITARIA SANGUINALIS COMPLEX IN NORTH AMERICA (POACEAE: PANICEAE). - 167 p.

Source: Dissertation Abstracts International, Volume: 42-07, Section: B, page: 2634.

Thesis (Ph.D.)--Texas A&M University, 1981.

A biosystematic treatment was made of the Digitaria sanguinalis complex in North America. Materials for morphological, anatomical, embryological, and cytological studies were collected from throughout this geographic area. Based on these studies six species are recognized: D. bicornis, D. ciliaris, D. sanguinalis, D. nuda, D. setigera, and D. horizontalis. No new species of new combinations were described. New biological descriptions are given for each of the recognized taxa.Subjects--Topical Terms:

1022885
Agriculture, Range Management.

A BIOSYSTEMATIC STUDY OF THE DIGITARIA SANGUINALIS COMPLEX IN NORTH AMERICA (POACEAE: PANICEAE).
LDR:03653nmm 2200277 4500 001 1819019
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008 130610s1981 d
035 $a (UnM)AAI8128938
035 $a AAI8128938
040 $a UnM $c UnM
100 1 $a WEBSTER, ROBERT DALE. $3 1908321
245 1 2 $a A BIOSYSTEMATIC STUDY OF THE DIGITARIA SANGUINALIS COMPLEX IN NORTH AMERICA (POACEAE: PANICEAE).
300 $a 167 p.
500 $a Source: Dissertation Abstracts International, Volume: 42-07, Section: B, page: 2634.
502 $a Thesis (Ph.D.)--Texas A&M University, 1981.
520 $a A biosystematic treatment was made of the Digitaria sanguinalis complex in North America. Materials for morphological, anatomical, embryological, and cytological studies were collected from throughout this geographic area. Based on these studies six species are recognized: D. bicornis, D. ciliaris, D. sanguinalis, D. nuda, D. setigera, and D. horizontalis. No new species of new combinations were described. New biological descriptions are given for each of the recognized taxa.
520 $a Development of the pedicelled and sessile spikelet was examined on each of the taxa by means of scanning electron microscopy. These investigations showed that epidermal cell types, patterns of nervation, and pubescence were highly variable and that these characters cannot be consistently correlated with the recognized taxa of the complex. A correlation existed between epidermal macrohairs and bulliform cells on the lemma of the lower floret. True heteromorphism was found to be not typical of North American specimens of the complex.
520 $a Detailed quantitative descriptions are given for leaf epidermal and internal anatomical characters. Based on the specimens examined, adaxial epidermal characters were used to differentiate among the taxa. However, the full range of variation within a single leaf, a specimen, or even between species is presently unknown. Anatomical characters of the leaf were found to be of the panicoid type. Based on a single sheath, radiating chlorenchyma, no endodermis, and centrifugal chloroplast it was concluded that all members of the complex were C(,4) subtype NADP-me.
520 $a A morphological examination was made on 245 populations of the complex. Phenetic and basic biostatistical techniques were used to delineate and define taxa. Principal components analysis, correlation and distance phenograms, and multivariate analysis of variance were used to show spacial relationships among population clusters. Correlation coefficients, means, ranges, standard deviations, coefficients of variation, nested analysis of variance, and discriminant analysis were used to compare and define species. Even though some intergradation occurs, six species were defined.
520 $a Normally developed mature embryo sacs of the Polygonum type were observed in all species. High germination rates occur in all taxa. Pollen viability ranged between 94% to 99% in all species. Pollen diameters of D. sanguinalis (2n = 36) were significantly smaller than the other species whereas, diameters for D. setigera (2n = 72) were significantly larger. Diameters for D. ciliaris (2n = 54) were variable, whereas measurements from populations of D. bicornis (2n = 72) did not differ significantly. Pollen diameters for D. nuda (2n = 36) averaged second largest among the species. Chromosome number cannot be consistently correlated with pollen size.
590 $a School code: 0803.
650 4 $a Agriculture, Range Management. $3 1022885
690 $a 0777
710 2 0 $a Texas A&M University. $3 718977
773 0 $t Dissertation Abstracts International $g 42-07B.
790 $a 0803
791 $a Ph.D.
792 $a 1981
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8128938