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  • AID0290919850
  • DOI10.1093/oxfordjournals.aob.a088002

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Stigma Morphology and Pollination in Arachis L. (Leguminosae)

Annals of Botany
Annals of Botany
Журнал с антэкологическими публикациями.
Oxford University Press · office@annbot.com

, 1990. V. 66. No. 1. P. 73–82
Two principal types of stigma were found in species of Arachis belonging to section Arachis and section Rhizomatosae. The different types did not correlate with sectional classification, genome groups or ploidy level, but did correlate with life form. All the perennial species studied had very small stigmas, which were guarded by a ring of hairs and were difficult to pollinate effectively. Most of the annuals, including the cultivated peanut (A. hypogaea), had larger stigmas, which were not surrounded by hairs and which were easily pollinated. One annual species, A. spinaclava, had a stigma intermediate in many of its characteristics between the other two types. Proteins, including esterase and acid phosphatase, were present in all stigmas before the flowers opened. Bud pollination produced apparently normal pollen tube growth in pistils of the wild annual A. spegazzinii and may overcome certain interspecific incompatibilities. Various methods of pollinating stigmas of the perennial species were tried, but even the most successful produced pollen tubes in less than half of the flowers pollinated. Difficulties in pollination, due to stigma morphology, probably explain the limited seed set and poor performance as female parents in interspecific crosses which have been reported for perennial species of Arachis.

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