Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion

Flora ◽  
2016 ◽  
Vol 219 ◽  
pp. 35-47 ◽  
Author(s):  
Hector A. Sato ◽  
Ana Maria Gonzalez
Keyword(s):  
Special Reference ◽  
Floral Development ◽  
Embryo Sac

DEVELOPMENT OF THE EMBRYO SAC AND EMBRYO OF TEFF, ERAGROSTIS TEF

1966 ◽  
Vol 44 (8) ◽  
pp. 1071-1075 ◽  
Author(s):  
Melak H. Mengesha ◽  
A. T. Guard
Keyword(s):  
Female Gametophyte ◽  
Leaf Blade ◽  
Floral Development ◽  
Flag Leaf ◽  
Embryo Sac ◽  
Eragrostis Tef ◽  
Careful Study ◽  
Embryo Formation ◽  
Self Pollination ◽  
Before And After

A careful study of the floral development of Eragrostis tef indicates that the flowers do not open and that self-pollination is the rule. Observations of the development of the female gametophyte show that it is of the normal monosporic type common to most angiosperms. The three antipodals divide several times as is common in grasses. Study of many ovules before and after fertilization showed absence of any apomictic type of embryo formation. Fertilization was found to occur in the basal floret of a spikelet when that floret was at the base of the flag leaf blade.

Floral development of Phyllanthus chekiangensis (Phyllanthaceae), with special reference to androecium and gynoecium

2012 ◽  
Vol 298 (7) ◽  
pp. 1229-1238 ◽  
Author(s):  
Zi-gang Zhang ◽  
Ai-ping Meng ◽  
Jian-qiang Li ◽  
Qi-gang Ye ◽  
Heng-chang Wang ◽  
...  
Keyword(s):  
Special Reference ◽  
Floral Development

Floral Development in Acacia pycnantha Benth. In Hook

1981 ◽  
Vol 29 (4) ◽  
pp. 385 ◽  
Author(s):  
MS Buttrose ◽  
WJR Grant ◽  
M Sedgley
Keyword(s):  
Light Microscopy ◽  
Pollen Development ◽  
Shoot Growth ◽  
Floral Development ◽  
Developmental Stages ◽  
Early Stage ◽  
Embryo Sac ◽  
Late Winter ◽  
Ovule Development ◽  
Floral Buds

Floral buds of Acacia pycnantha were produced in every month of the year on new shoot growth. The buds produced between November and May developed through to flowering but those produced between June and October aborted at an early stage. Differences in the rate of floral development caused buds produced several months apart to flower in the same month in late winter. Developmental stages from newly produced flower heads to anthesis were studied by light microscopy. Pollen development preceded ovule development and the 16-celled polyads were formed 1 month prior to flowering and before development of the embryo sac.

A contribution to the life history of Angophora floribunda (Sm.) Sweet (Myrtaceae)

1969 ◽  
Vol 17 (3) ◽  
pp. 457 ◽  
Author(s):  
N Prakash
Keyword(s):  
Floral Development ◽  
Outer Integument ◽  
Embryo Sac ◽  
Pollen Grains ◽  
Flower Buds ◽  
Polygonum Type ◽  
Mature Embryos ◽  
History Of ◽  
Sterile Pollen ◽  
Mother Cells

The flower buds of Angophora floribunda appear in the last week of November and anthesis occurs in the middle of January the following year. There is no prolonged resting phase at any stage during embryology and the seeds are shed during late February to early March. In floral development, the petals are the last structures to be formed. Early anther development precedes corresponding stages in the ovules of the same flower, but events in the ovules proceed more rapidly and meiosis occurs simultaneously in the spore mother cells of both organs. The mature two-celled pollen grains are shed when the ovules contain four-or eight-nucleate embryo sacs. Many flowers bear anthers containing only sterile pollen grains, which occur either singly or as tetrads. Various abnormalities in the development of the pollen are reported, and the anthers containing sterile pollen neither develop fibrous bands in the endothecium nor do they dehisce. The ovules are bitegminal, crassinucellar, and hemianatropous. Occasional bifurcation of the inner integument was observed and a hypostase differentiates at the four-nucleate stage of the embryo sac. The embryo sac follows the Polygonum type of development and is five-nucleate and four-celled when mature. The endosperm is Nuclear in origin, and in about half the seeds examined a granular unidentified substance accumulates in the embryo sac. The development of the embryo is irregular and the seedlings bear a collar-like structure at the junction of the hypocotyl and the radicle. The mature embryos are usually dicotyledonous but rarely tricotyledonous. The seed coat is formed exclusively by the outer integument; in the ripe seed it consists of an outer epidermis of large, palisade-like, thin-walled, tanniniferous cells and an inner crystalliferous layer.

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