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The male sterility system in hybrid seed production can eliminate the cost of emasculation and ensure seed hybridity through
avoidance of self pollination. GMS and CMS are two types of male sterility system that currently employed in pepper breeding.
Conversion from GMS to CMS will increase the male sterility proportion of female parent from 50 to 100%. In this study, segregation
analysis of four male sterile mutants consisting of one CMS mutant (CA1) and three GMS mutants (GA1, GA3 and GA4) showed that
each had single recessive gene inheritance. A modified complementation test was performed by replacing male sterile mutants
with their maintainer line as male parent. The nuclear restorer gene for CMS was independent of all nuclear restorer genes
for GMS and all nuclear restorer genes for GMS were independent each other. Further observation on CMS and GMS male sterility
loci revealed that GA1 and GA3 had mutated in both nuclear restorer genes for CMS and GMS, while CA1 and GA4 each carried
mutation in single male sterility system of nuclear restorer gene for CMS and GMS, respectively. Conversion from GMS to CMS
in the case of lines carried mutations in both sterility systems required only S-type cytoplasm donor, while lines carried
mutation in single nuclear restorer gene for GMS required not only S-type cytoplasm but also rf allele donors. The important finding is the broader function of maintainer line in certain male sterility system that can
be used as a maintainer or restorer line for other male sterility systems. We also confirmed that line CC1 is the general
restorer for both CMS and GMS systems. 相似文献
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