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A biosystematic study of selected fa...

Wipff, Joseph Karl, III.

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A biosystematic study of selected facultative apomictic species of Pennisetum (Poaceae: Paniceae).

Record Type:	Electronic resources : Monograph/item
Title/Author:	A biosystematic study of selected facultative apomictic species of Pennisetum (Poaceae: Paniceae)./
Author:	Wipff, Joseph Karl, III.
Description:	183 p.
Notes:	Source: Dissertation Abstracts International, Volume: 56-06, Section: B, page: 2981.
Contained By:	Dissertation Abstracts International56-06B.
Subject:	Biology, Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9534459

A biosystematic study of selected facultative apomictic species of Pennisetum (Poaceae: Paniceae).
Wipff, Joseph Karl, III.

A biosystematic study of selected facultative apomictic species of Pennisetum (Poaceae: Paniceae). - 183 p.

Source: Dissertation Abstracts International, Volume: 56-06, Section: B, page: 2981.

Thesis (Ph.D.)--Texas A&M University, 1995.

Pennisetum flaccidum, a facultative aposporous apomict, was used as a female parent and was crossed with the following apomictic species of Pennisetum: P. mezianum, P. massaicum, P. orientale, and P. ciliare var. setigerum. These crosses were made to begin to understand the basic formation of agamic complexes in Pennisetum. The objectives of the study were to create an artificial agamic complex using controlled hybridizations, numerically analyze the morphological variation between facultative aposporous species and their hybrids, determine the frequency if n + n, 2n + n, 2n + 2n hybrids and their stability, and to gain a better understanding of the processes within agamic groups that will aid in developing a classification system for these agamic complexes.Subjects--Topical Terms:

1017825
Biology, Botany.

A biosystematic study of selected facultative apomictic species of Pennisetum (Poaceae: Paniceae).
LDR:02361nmm 2200277 4500 001 1819058
005 20061004161445.5
008 130610s1995 eng d
035 $a (UnM)AAI9534459
035 $a AAI9534459
040 $a UnM $c UnM
100 1 $a Wipff, Joseph Karl, III. $3 1908359
245 1 2 $a A biosystematic study of selected facultative apomictic species of Pennisetum (Poaceae: Paniceae).
300 $a 183 p.
500 $a Source: Dissertation Abstracts International, Volume: 56-06, Section: B, page: 2981.
500 $a Co-Chairs: Mark A. Hussey; Stephan L. Hatch.
502 $a Thesis (Ph.D.)--Texas A&M University, 1995.
520 $a Pennisetum flaccidum, a facultative aposporous apomict, was used as a female parent and was crossed with the following apomictic species of Pennisetum: P. mezianum, P. massaicum, P. orientale, and P. ciliare var. setigerum. These crosses were made to begin to understand the basic formation of agamic complexes in Pennisetum. The objectives of the study were to create an artificial agamic complex using controlled hybridizations, numerically analyze the morphological variation between facultative aposporous species and their hybrids, determine the frequency if n + n, 2n + n, 2n + 2n hybrids and their stability, and to gain a better understanding of the processes within agamic groups that will aid in developing a classification system for these agamic complexes.
520 $a The study of these controlled hybrids has revealed that the 2n + n hybrids are stable reproductively and are morphology distinct from either parent. The n + n hybrids, as expected from wide interspecific hybridizations, were self sterile due to the high abortion of the microgametophytes and megametophytes, however when viable pollen was provided from the male parent the aposporous embryo sacs functioned to form seeds through pseudogamous seed set. The hybrids in all cases were morphologically distinct from the parents and given the reproductive stability of the 2n + n hybrids they could described as a separate species if their lineage was not known.
590 $a School code: 0803.
650 4 $a Biology, Botany. $3 1017825
690 $a 0309
710 2 0 $a Texas A&M University. $3 718977
773 0 $t Dissertation Abstracts International $g 56-06B.
790 1 0 $a Hussey, Mark A., $e advisor
790 1 0 $a Hatch, Stephan L., $e advisor
790 $a 0803
791 $a Ph.D.
792 $a 1995
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9534459