The effect of polyploidy and hybridity on seed size in crosses betweenBrassica chinensis, B. carinata, amphidiploidB. chinensis-carinata and auto-tetraploidB. chinensis View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1942-01

AUTHORS

H. W. Howard

ABSTRACT

1. AmphidiploidBrassica chinensis-carinata and autotetraploidB. chinensis plants were obtained by colchicine treatment. 2. The amphidiploid (2n = 54) has a fairly regular meiosis and is quite fertile. 3. A study was made of crosses betweenB. chinensis, B. carinata, the amphidiploidB. chinensis-carinata and autotetraploidB. chinensis. Pollen-tube growth appeared to be good in all crosses. 4. A high set of good seeds per fruit is produced in crosses of the types, diploid × diploid, tetraploid × tetraploid and tetraploid female × diploid. Crosses of the type diploid female × tetraploid never produced a high set of good seeds, developed ovules only being obtained from such crosses. 5.B. carinata (n = 17), although an allotetraploid species, appeared to behave as a diploid in its physiology of seed production. 6. Good seeds from crosses of the type tetraploid female × diploid are only about one-third the size of normal seeds from selfing diploids. ‘Hybridity’ may also produce a reduction in seed size. 7. It is suggested that some allotetraploid species may have evolved so as to have a ‘diploid physiology’. More... »

PAGES

105

Journal

TITLE

Journal of Genetics

ISSUE

1-2

VOLUME

43

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02982749

DOI

http://dx.doi.org/10.1007/bf02982749

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1029252473


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