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Microsporogenesis Abortion in Cytoplasmic Male Sterile Plants from H. petiolaris or H. petiolaris fallax Crossed by Sunflower (Helianthus annuus)
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References
1989
Year
FertilityBotanyGeneticsPlant PathologyReproductive BiologyPollen AbortionFertilisationEmbryologyPlant DevelopmentSunflower LinesMicrosporogenesis AbortionPlant ReproductionPublic HealthPlant CytologyInfertilityH. PetiolarisMeiosisMale Fertile LinesBiologyDevelopmental BiologyMicropropagationMedicinePlant Physiology
The microsporogenesis of two sunflower lines carrying two different cytoplasmic male sterilities (CMS) from H. petiolaris (PL) and from H. petiolaris fallax (PF) has been studied and compared to the normal process in male fertile lines. The first signs of abortion are, respectively, the vacuolation of the endoplasmic reticulum in PL during the first division of meiosis and the abnormal deposition of the endexine layer in PF during the vacuolation of the microspore. The genotype of the male line seems to modulate the stage of pollen abortion, Furthermore, two ways of abortion have been observed for a single male sterile plant. Consequently, we suggest that the ultrastructural observations reflect only the main consequences of a primary unknown event which takes place earlier.