Degree Type

Dissertation

Date of Award

1946

Degree Name

Doctor of Philosophy

Department

Botany

Abstract

The present study of the development and structure of the vegetative and reproductive organs of kudzu was undertaken to furnish a basis for studies in the breeding, cultivation and utilisation of the plant;Kudzu is a coarse, hairy, stoloniferous vine with alternate, trifoliate compound leaves and racemose, papilionaceous flowers. Twenty to thirty days are required for the completion of anthesis in one raceme;The order of initiation of floral organs is sepals, petals, stamens, and carpel;The haploid number of chromosomes is eleven. The ovules arise as dome-shaped primordia along the inner margins of the ventral suture. The nine to thirteen campylotropous ovules develop simultaneously, arranged alternately in two rows;The sporogenous cell generally functions directly as the megasporocyte which undergoes meiotic divisions and produces a linear tetrad of megaspores. Three of the megaspores disintegrate, and the surviving chalazal megaspore gives rise to the female gametophyte;The female gametophyte consists of two polars, an egg, and two synergide. The antipodals disappear before fertilization. The nucellus soon becomes absorbed at the micropylar end and along the sides;The proembryo has a short, massive suspensor of several tiers of cells. The mature embryo consists of two cotyledons, a simple leaf, a compound leaf and a large radicle;The endosperm remaining when the seed is mature constitutes an unbroken covering of two to several cell layers in thickness around the embryo;The seed coat is almost entirely the product of the outer integument. The malpighian layer has no well-defined cuticularized layer, and no domes or light line. The osteosclereide layer consists of one row of I-shaped cells. The layer is continuous except in the region of the hilum. The nutritive layer contains chloroplasts;An arillate rim surrounds the hilum. The strophiole is a small, elongated depression in the region of the hilum opposite the micropyle.

DOI

https://doi.org/10.31274/rtd-180813-14059

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Harry Josef Romm

Language

en

Proquest ID

AAIDP11857

File Format

application/pdf

File Size

43 pages

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