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Publication Type J
Authors KUO, J; LONG, WL; COLES, RG
Author Full Name KUO, J; LONG, WL; COLES, RG
Title OCCURRENCE AND FRUIT AND SEED BIOLOGY OF HALOPHILA-TRICOSTATA GREENWAY (HYDROCHARITACEAE)
Source AUSTRALIAN JOURNAL OF MARINE AND FRESHWATER RESEARCH
Language English
Document Type Article
Keywords Plus DECIPIENS OSTENFELD HYDROCHARITACEAE; ENGELMANNII HYDROCHARITACEAE; REDFISH BAY; GERMINATION; SEAGRASS; ASCHERS; RESERVE; PANAMA; TEXAS; QUEENSLAND
Abstract Halophila tricostata Greenway appears to be endemic to eastern Queensland, Australia, and occurs between 14-degrees 11'S and 23-degrees 45'S. It was found at depths from 1.4 to 30 m in well sheltered habitats, including in shallow coastal sites near mangrove-lined estuaries, on the lee side of continental and coral-reef islands, and on some commercial prawn-trawling grounds within the Great Barrier Reef lagoon. It grows on predominantly fine mud substratum in small monospecific meadows or mixed with other tropical seagrasses, mostly other Halophila species. Field observations indicate that H. tricostata is an annual angiosperm and produces an estimated 70000 seeds m-2 year-1. Halophila tricostata is dioecious. The plant has a horizontal rhizome bearing an erect shoot with eight to twelve nodes and a root at each rhizome node. Except at the first two or three nodes, the mature plants produce a reproductive organ at each node of their rarely branched erect shoot. The reproductive organs and fruits develop and mature acropetally along the erect shoot. There are 24-60 seeds, with a mean of 41 seeds, per fruit. The seed has a coiled embryo protected by a cotyledon, and an enlarged hypocotyl. The hypocotyl acts as a nutrient store and contains starch, protein and lipid. The seed covering consists of pericarp remains and two thin cuticular layers of seed coat. The surface of the seed covering has numerous fine protrusions. The seed covering becomes loose and is discarded during germination, exposing the hypocotyl. The surface of the hypocotyl develops hair-like unicellular structures during seedling development. The majority of the seeds begin to germinate at 26-28-degrees-C after two weeks of culturing, but germination is not synchronized. The culturing of H. tricostata seedlings beyond the three-leaf stage was not successful.
Author Address QUEENSLAND DEPT PRIMARY IND,CTR NORTHERN FISHERIES,CAIRNS,QLD 4871,AUSTRALIA
Reprint Address KUO, J (reprint author), UNIV WESTERN AUSTRALIA,CTR MICROSCOPY & MICROANAL,NEDLANDS,WA 6009,AUSTRALIA.
ORCID Number Coles, Robert/0000-0002-3192-3778
Cited Reference Count 33
Times Cited 17
Total Times Cited Count (WoS, BCI, and CSCD) 19
Publisher C S I R O PUBLICATIONS
Publisher City COLLINGWOOD
Publisher Address 150 OXFORD ST, PO BOX 1139, COLLINGWOOD VICTORIA 3066, AUSTRALIA
ISSN 0067-1940
29-Character Source Abbreviation AUST J MAR FRESH RES
Year Published 1993
Volume 44
Issue 1
Beginning Page 43
Ending Page 57
Page Count 15
Web of Science Category Fisheries; Limnology; Marine & Freshwater Biology; Oceanography
Subject Category Fisheries; Marine & Freshwater Biology; Oceanography
Document Delivery Number LH428
Unique Article Identifier WOS:A1993LH42800005
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