Chromosome association and pollen fertility of parental and interspecific hybrids of Lycopersicon esculentum X L. hirsutum and L. pennellii

Genetica ◽  
1996 ◽  
Vol 98 (1) ◽  
pp. 103-106 ◽  
Author(s):  
Soliman A. Haroun
Keyword(s):  
Lycopersicon Esculentum ◽  
Pollen Fertility ◽  
Interspecific Hybrids ◽  
Chromosome Association

scholarly journals Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf

2011 ◽  
Vol 11 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Carine Simioni ◽  
Cacilda Borges do Valle
Keyword(s):  
Chromosome Segregation ◽  
Pollen Fertility ◽  
Interspecific Hybrids ◽  
Somatic Chromosome ◽  
Breeding Program ◽  
Meiotic Behavior ◽  
Brachiaria Decumbens ◽  
Meiotic Analysis ◽  
Chromosome Duplication

The meiotic behavior of three tetraploid plants (2n=4x=36) originated from somatic chromosome duplication of sexually reproducing diploid plants of Brachiaria decumbens was evaluated. All the analyzed plants presented abnormalities related to polyploidy, such as irregular chromosome segregation, leading to precocious chromosome migration to the poles and micronuclei during both meiotic divisions. However, the abnormalities observed did not compromise the meiotic products which were characterized by regular tetrads and satisfactory pollen fertility varying from 61.36 to 64.86%. Chromosomes paired mostly as bivalents in diakinesis but univalents to tetravalents were also observed. These studies contributed to the choice of compatible fertile sexual genitors to be crossed to natural tetraploid apomicts in the B. decumbens by identifying abnormalities and verifying pollen fertility. Intraespecific crosses should reduce sterility in the hybrids produced in the breeding program of Brachiaria, a problem observed with the interspecific hybrids produced so far.

scholarly journals Development of Interspecific Hybrids between Lycopersicon esculentum and L.peruvianum var. humifusum and Introgression of L.peruvianum Invertase Gene into L.esculentum.

1996 ◽  
Vol 46 (4) ◽  
pp. 355-359
Author(s):  
Shigeru Imanishi ◽  
Hiroaki Egashira ◽  
Hiroshi Tanaka ◽  
Satoshi Harada ◽  
Rintaro Nishimura ◽  
...  
Keyword(s):  
Lycopersicon Esculentum ◽  
Interspecific Hybrids ◽  
Invertase Gene

TRISOMIC PROGENY FROM INTERSPECIFIC HYBRIDS BETWEEN HELIANTHUS MAXIMILIANI AND H. ANNUUS

1982 ◽  
Vol 24 (4) ◽  
pp. 375-384 ◽  
Author(s):  
Ernest D. P. Whelan
Keyword(s):  
High Frequency ◽  
Pollen Fertility ◽  
Interspecific Hybrids ◽  
Extra Chromosome ◽  
Chromosome Elimination ◽  
Perennial Species ◽  
Two Generations ◽  
Pollen Shed

Interspecific hybrids between the diploid (2n = 34) perennial species Helianthus maximiliani Schrad. and wild H. annuus L. (2n = 34) had multivalents in meiosis. Consecutive backcrossing of the hybrids by the open-pollinated sunflower (H. annuus L.) cv. 'Saturn' resulted in rapid normalization of meiosis. However, some plants with highly modified anthers occurred and such plants were found to be diploid, whereas many plants with normal anthers and pollen shed were trisomic (2n + 1). Trisomics were first observed in two of three progenies after two crosses by 'Saturn'. Further backcrossing of trisomic females for two generations indicated about 50% megagametophyte transmission of the extra chromosome in one line and 10% in two others. Plants with a high frequency of 17 bivalents and a univalent in diplotene-MI had a higher frequency of chromosome elimination in subsequent division stages and a lower frequency of megagametophyte transmission of the extra chromosome, compared to plants having a high frequency of 16 bivalents and a trivalent. Elimination of the extra chromosome was correlated with increased pollen fertility. Primary interchange or tertiary trisomics were implicated by meiotic and fertility observations but were not identified as to type.

scholarly journals The effects of fosetyl-Al application on morphology and viability of Lycopersicon esculentum Mill. pollen

2008 ◽  
Vol 54 (No. 8) ◽  
pp. 336-340 ◽  
Author(s):  
İ. Öztürk Çalı
Keyword(s):  
Lycopersicon Esculentum ◽  
Pollen Fertility ◽  
Pollen Viability ◽  
Polar View ◽  
The Other ◽  
Control Group ◽  
Recommended Dosage ◽  
Viable Pollen ◽  
Pollen Types ◽  
Viability Level

In the present study, the effects of fungicide Aliette WG 800 [80% fosetyl-Al (aluminium tris-o-ethyl phosphonate)], widely used against <I>Phytophtora infestans</I> on tomatoes grown in greenhouse in Turkey, were studied on the morphology and viability of tomato (<I>Lycopersicon esculentum</I> Mill.) pollens. The fungicide was applied to tomatoes grown in greenhouse at recommended dosage (200 g/100 l water) and at double the recommended dosage (400 g/100 l water). The fungicide caused changes in the morphological structures of tomato pollens. Some pollen morphological structures that are not observed in the control group were encountered in the pollens in equatorial view and in polar view at 200 g/100 l treated groups. On the other hand, pollen viability level decreased as the dosage increased. Especially, non-viable pollen types such as wrinkled pollen or pollen with abnormal shape were encountered in the fungicide groups. It was expected that the pollen fertility as well as yield would decrease in future.

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