The crossing of common wheat (Triticum aestivum L.) with cultivated rye (Secale cereale L.). I. crossability, pollen grain germination and pollen tube growth

Euphytica ◽  
1976 ◽  
Vol 25 (1) ◽  
pp. 609-620 ◽  
Author(s):  
Wouter Lange ◽  
Barbara Wojciechowska
Keyword(s):  
Triticum Aestivum ◽  
Pollen Tube ◽  
Common Wheat ◽  
Secale Cereale ◽  
Pollen Tube Growth ◽  
Triticum Aestivum L ◽  
Pollen Grain ◽  
Tube Growth ◽  
Pollen Grain Germination ◽  
Secale Cereale L

Cross-incompatibility of common wheat with rye: effect of varying the day of pollination on seed set and development

1978 ◽  
Vol 56 (23) ◽  
pp. 3000-3007 ◽  
Author(s):  
Julian B. Thomas ◽  
R. Glenn Anderson
Keyword(s):  
Triticum Aestivum ◽  
Common Wheat ◽  
Secale Cereale ◽  
Seed Set ◽  
Triticum Aestivum L ◽  
Hybrid Seed ◽  
Intergeneric Cross ◽  
Secale Cereale L ◽  
Wheat Spike

Varieties of common wheat (Triticum aestivum L. em. Thell.) of low wheat–rye crossability showed increased seed set if pollinated with cultivated rye (Secale cereale L.) before the wheat spike attained maximum receptivity to wheat pollen (before the stage of first anthesis). After first anthesis the development of hybrid seed progressively deteriorated with increasing lateness of pollination. Premature or 'bud' pollination may be a useful approach for overcoming intergeneric cross-incompatibility barriers in the Triticineae.

Factors limiting hybridization between Penstemon spectabilis and Penstemon centranthifolius

2001 ◽  
Vol 79 (12) ◽  
pp. 1439-1448 ◽  
Author(s):  
Jeannie Chari ◽  
Paul Wilson
Keyword(s):  
Pollen Tube ◽  
Pollen Tube Growth ◽  
Fruit Set ◽  
Seed Set ◽  
Pollen Grain ◽  
Tube Growth ◽  
Natural Hybridization ◽  
Poor Growth ◽  
Pollen Grain Germination ◽  
Isolating Mechanisms

Speciation involves the formation of reproductive isolating mechanisms such as a difference in pollinators, incompatibility between pollen tubes and stylar tissue, hybrid seed abortion, or poor growth of hybrid seedlings. We studied reproductive isolating mechanisms in naturally sympatric populations of Penstemon spectabilis Thurber and Penstemon centranthifolius (Benth.) Benth. where F1 hybrids occurred at very low frequency. We compared conspecific crosses, backcrosses, and heterospecific crosses in terms of pollen grain germination, pollen tube growth, fruit set, seed set, and offspring performance. We found several postpollination barriers to hybridization. When P. spectabilis was the ovule parent, the lack of natural hybridization was partially explained by the presence of two isolating factors: reduced pollen tube growth and reduced seed set. When P. centranthifolius was the recipient, the barrier to hybridization was nearly 100% effective and occurred primarily at the stages of pollen grain germination and fruit set. The success of backcrossing was generally intermediate between conspecific and heterospecific crossing. For these two species, it is likely that partial pollinator specificity in addition to strong postpollination reproductive isolating mechanisms contribute to maintaining the species boundary.Key words: speciation, hybridization, introgression, Penstemon, reproductive isolating barriers.

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