Heritable Effect of Plant Water Availability Conditions on Restoration of Male Fertility in the "9E" CMS-Inducing Cytoplasm of Sorghum
Heritable changes of phenotype arising in plant ontogenesis by the influence of environmental factors belong to the most intriguing genetic phenomena. An unusual inheritance pattern was detected during examination of male fertility restoration in the CMS-inducing "9E" type cytoplasm of sor...
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Published in | Frontiers in plant science Vol. 3; p. 91 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Switzerland
Frontiers Research Foundation
01.01.2012
Frontiers Media S.A |
Subjects | |
Online Access | Get full text |
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Summary: | Heritable changes of phenotype arising in plant ontogenesis by the influence of environmental factors belong to the most intriguing genetic phenomena. An unusual inheritance pattern was detected during examination of male fertility restoration in the CMS-inducing "9E" type cytoplasm of sorghum: Rf-genes were functional in self-pollinated progeny of F(1) hybrids yet were either not expressed or poorly expressed in backcrosses of these hybrids to CMS-lines with the same cytoplasm type. In experiments on parallel growing of the same F(1) hybrid combinations in the "dry plot" and in the "irrigated plot," it was found that high level of plant water availability during panicle and pollen developmental stages significantly increased male fertility of F(1) and test-cross hybrid populations, in which fertility-restoring genes were in heterozygote state, whereas in F(2) populations the influences of water availability conditions cause less pronounce effects. Similarly, male-sterile F(1) plants, being transferred from the "dry plot" to greenhouse, produced male-fertile panicles. In addition, male-sterile plants from F(2) families, which segregated-out as recessives, being transferred to greenhouse also produced male-fertile panicles. In the progenies of these revertants that were grown in field conditions and in the "dry plot," stable inheritance of male fertility for three cycles of self-pollination was observed, and a number of stable fertile lines in the "9E" cytoplasm were obtained. However, in test-crosses of these fertile lines to CMS-lines with the "9E" cytoplasm restoration of male fertility was not observed, except the progeny of one revertant that behaved as fertility-restorer line. These data suggest that the functional state of fertility-restoring genes for the "9E" sorghum cytoplasm is epigenetically regulated trait established by the influence of environmental factors and is transmitted to sexual generations. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Reviewed by: Richard A. Jorgensen, National Laboratory of Genomics for Biodiversity, Mexico; Igor Kovalchuk, University of Lethbridge, Canada Edited by: Richard A. Jorgensen, National Laboratory of Genomics for Biodiversity, Mexico This article was submitted to Frontiers in Plant Genetics and Genomics, a specialty of Frontiers in Plant Science. |
ISSN: | 1664-462X 1664-462X |
DOI: | 10.3389/fpls.2012.00091 |