fungi-2-reproduction - sporangium and releases its spores...

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Fungi 2 Rhizopus - Sexual reproduction (a) Adjacent hyphae put out protuberances (b) Where they meet, the tips of the hyphae swell and are cut off by cross walls. The nuclei divide rapidly (c) The intervening walls break down and the nuclei fuse in pairs. The whole structure is called a zygospore (d) The zygospore wall thickens and the hyphae shrivel. The thick-walled zygospore can remain dormant for a few months and can withstand drought and extremes of temperature (e) In suitable conditions the zygospore germinates to produce a single vertical hypha which forms a
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Unformatted text preview: sporangium and releases its spores hypha sporangium zygospore wall breaks open zygospore © D.G. Mackean Sexual reproduction takes place only between two different strains of Rhizopus. The strains are visually indistinguishable but may have differences in their physiology, e.g. one may be able to digest organic matter better than the other. In sexual reproduction, beneficial characteristics like this may be combined, leading to a more successful strain of the fungus. nuclei...
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