Cryptic dioecy and leaky dioecy in endemic species of Dombeya (Sterculiaceae) on La Re´union
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چکیده
منابع مشابه
Cryptic dioecy of Symplocos wikstroemiifolia Hayata (Symplocaceae) in Taiwan
Symplocos wikstroemiifolia Hayata is one of the few morphologically androdioecious species in Symplocaceae. Although this species has been proposed as cryptically dioecious, little is known about its patterns of sexual expression in the field. We studied the breeding system and reproductive biology of S. wikstroemiifolia in Taiwan. Field investigations showed that anthers of most morphologicall...
متن کاملCryptic dioecy in Mussaenda pubescens (Rubiaceae): a species with stigma-height dimorphism.
BACKGROUND AND AIMS Evolutionary transitions from heterostyly to dioecy have been proposed in several angiosperm families, particularly in Rubiaceae. These transitions involve the spread of male and female sterility mutations resulting in modifications to the gender of ancestral hermaphrodites. Despite sustained interest in the gender strategies of plants, the structural and developmental bases...
متن کاملPaternal effects on functional gender account for cryptic dioecy in a perennial plant.
Natural selection operates on the mating strategies of hermaphrodites through their functional gender, i.e. their relative success as male versus female parents. Because functional gender will tend to be strongly influenced by sex allocation, it is often estimated in plants by counting seeds and pollen grains. However, a plant's functional gender must also depend on the fate of the seeds and po...
متن کاملDioecy, hermaphrodites and pathogen load in plants
Sex-specifi c investment in pathogen resistance and immunity has been widely reported in animals and to a much lesser degree in plants. Here, we investigated the incidence of fungal pathogens in dioecious versus hermaphroditic plant species. We found that direct studies on diff erences between males and females in disease resistance or pathogen incidence were rare or non-existent in plants, but...
متن کاملDiversification, dioecy and dimorphism in schistosomes.
In addition to causing one of the great neglected diseases of the world, schistosomes have unusual biological features that further command attention, including their habit of living in the blood of their hosts and the presence of separate, dimorphic sexes. Phylogenetic studies including a more complete sampling of pivotal and rare schistosomes and their relatives, provide an improved framework...
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ژورنال
عنوان ژورنال: American Journal of Botany
سال: 1999
ISSN: 0002-9122
DOI: 10.2307/2656925