Cytological mechanism of 2n pollen formation and unilateral sexual polyploidization in Lolium

Euphytica ◽  
1989 ◽  
Vol 43 (1-2) ◽  
pp. 1-6 ◽  
Author(s):  
C. A. Sala ◽  
E. L. Camadro ◽  
M. T. Salaberry ◽  
A. O. Mendiburu
Keyword(s):  
2N Pollen ◽  
Sexual Polyploidization ◽  
Unilateral Sexual Polyploidization ◽  
Pollen Formation ◽  
Cytological Mechanism

Occurrence and cytological mechanism of 2n pollen formation in ChineseDiospyrosspp. (Ebenaceae) staminate germplasm

2008 ◽  
Vol 83 (5) ◽  
pp. 668-672 ◽  
Author(s):  
Li-Qing Xu ◽  
Qing-Lin Zhang ◽  
Zheng-Rong Luo
Keyword(s):  
2N Pollen ◽  
Pollen Formation ◽  
Cytological Mechanism

Introgression of Solarium acaule germ plasm from the endosperm balance number 2 gene pool into the cultivated endosperm balance number 4 potato gene pool via triplandroids

Genome ◽  
1990 ◽  
Vol 33 (2) ◽  
pp. 273-278 ◽  
Author(s):  
C. R. Brown ◽  
K. Adiwilaga
Keyword(s):  
Gene Pool ◽  
Interspecific Hybrids ◽  
Germ Plasm ◽  
Interspecific Crosses ◽  
Endosperm Balance Number ◽  
2N Pollen ◽  
Stainable Pollen ◽  
Low Frequencies ◽  
Pollen Formation ◽  
Cytological Mechanism

Triploid plants from interspecific crosses between selected clones of Solanum acaule and a 2n pollen producing, cultivated diploid expressed an average of 7.7% to 2n pollen, called triplandroids. Percent stainable pollen of these triploids ranged from 1.8 to 22.1%. The cytological mechanism of 2n pollen formation was parallel orientation of spindles in the second division of meiosis. Three triplandroid-producing triploids were crossed to several tetraploid potato cultivars and breeding clones. Of these 4x−3x pollinations, 49% produced berries, containing an average of 15.2 seeds. Progeny from 4x−3x crosses were 67% pentaploid, 2n = 60, and 33% aneuploids 2n = 56–59, mostly 2n = 59. Thus, functional microspores from triploids were predominantly triplandroids, 2n = 3x = 36, with low frequencies of aneuploidy. This use of a triplandroid bridge is a rapid means of introducing S. acaule germ plasm to the cultivated tetraploid gene pool.Key words: interspecific hybrids, parallel spindles, pollen restitution, triploidy, 2n pollen.

Cytological mechanism of 2n pollen formation in Chinese jujube (Ziziphus jujuba Mill. ‘Linglingzao’)

Euphytica ◽  
2011 ◽  
Vol 182 (2) ◽  
pp. 231-238 ◽  
Author(s):  
Zhihui Xue ◽  
Ping Liu ◽  
Mengjun Liu
Keyword(s):  
2N Pollen ◽  
Chinese Jujube ◽  
Ziziphus Jujuba ◽  
Pollen Formation ◽  
Cytological Mechanism

Cytology of 2n Pollen Formation in Diploid Crested Wheatgrass, Agropyron cristatum

Crop Science ◽  
1992 ◽  
Vol 32 (6) ◽  
pp. 1361-1365 ◽  
Author(s):  
Ian M. Ray ◽  
Mary K. Tokach
Keyword(s):  
Agropyron Cristatum ◽  
2N Pollen ◽  
Crested Wheatgrass ◽  
Pollen Formation

CYTOLOGY OF 2n POLLEN FORMATION IN DIPLOID ALFALFA, MEDICAGO SATIVA

1979 ◽  
Vol 21 (4) ◽  
pp. 525-530 ◽  
Author(s):  
Nicholi Vorsa ◽  
E. T. Bingham
Keyword(s):  
Medicago Sativa ◽  
Seed Set ◽  
Pollen Grains ◽  
Genetic Constitution ◽  
2N Pollen ◽  
Diploid Parent ◽  
2N Gamete ◽  
Medicago Sativa L ◽  
Pollen Formation ◽  
Mother Cells

Four diploid (2x) clones of alfalfa, Medicago sativa L., which produced good seed set when used as male parents in 4x-2x crosses were selected for study. The 2x clones descended from 2x haploids of cultivated 4x alfalfa. Fertility in the 4x-2x cross was due to the production of pollen with the unreduced chromosome number (2n pollen) from the 2x parent. The cytological mechanism of 2n pollen formation was found to be disorientation of spindles at metaphase II in up to 38% of the pollen mother cells. Thus, both n and 2n pollen were produced by all four diploids examined. Normal spindles at metaphase II were oriented such that they defined the poles of a tetrahedron and resulted in normal tetrads in a tetrahedral arrangement. Disoriented spindles were basically parallel to each other and resulted in formation of dyads and occasionally a triad. Dyads developed into two 2n pollen grains; triads developed into one 2n and two n pollen grains. Since both n and 2n pollen grains are produced by the diploids, they can be maintained as diploids or they can be used as male parents in crosses to tetraploids. The genetic constitution of 2n pollen resulting from parallel spindles is similar to that expected after first division restitution of meiosis and much of the heterozygosity of the diploid parent is conserved in the gametes. The 2n gamete mechanism has potential application in germplasm transfer and in maximizing heterozygosity in tetraploid hybrids.

Cytological mechanisms of 2n pollen formation in the wild potato Solanum okadae and pollen-pistil relations with the cultivated potato, Solanum tuberosum

2007 ◽  
Vol 55 (3) ◽  
pp. 471-477 ◽  
Author(s):  
Elsa Lucila Camadro ◽  
Sandra Karina Saffarano ◽  
Juan Carlos Espinillo ◽  
Mateo Castro ◽  
Phillip W. Simon
Keyword(s):  
Solanum Tuberosum ◽  
Wild Potato ◽  
2N Pollen ◽  
Cultivated Potato ◽  
In The Wild ◽  
Pollen Formation

Evaluation for chipping and tuber soft rot (Erwinia carotovora) resistance in potato clones from unilateral sexual polyploidization (2x × 4x)

2002 ◽  
Vol 79 (2) ◽  
pp. 139-145 ◽  
Author(s):  
A. Capo ◽  
M. Cammareri ◽  
F. Delia Rocca ◽  
A. Errico ◽  
A. Zoina ◽  
...  
Keyword(s):  
Erwinia Carotovora ◽  
Soft Rot ◽  
Sexual Polyploidization ◽  
Unilateral Sexual Polyploidization ◽  
Soft Rot Erwinia

Meiotic aberrations during 2n pollen formation in Begonia

Heredity ◽  
2009 ◽  
Vol 104 (2) ◽  
pp. 215-223 ◽  
Author(s):  
A Dewitte ◽  
T Eeckhaut ◽  
J Van Huylenbroeck ◽  
E Van Bockstaele
Keyword(s):  
2N Pollen ◽  
Pollen Formation ◽  
Meiotic Aberrations
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