Weedy rice (Oryza sativa) I. Grain characteristics and growth response to competition of weedy rice variants from five Asian countries

Chauhan, Bhagirath S. and Johnson, David E. (2010) Weedy rice (Oryza sativa) I. Grain characteristics and growth response to competition of weedy rice variants from five Asian countries. Weed Science, 58 4: 374-380. doi:10.1614/WS-D-09-00071.1


Author Chauhan, Bhagirath S.
Johnson, David E.
Title Weedy rice (Oryza sativa) I. Grain characteristics and growth response to competition of weedy rice variants from five Asian countries
Journal name Weed Science   Check publisher's open access policy
ISSN 0043-1745
1550-2759
Publication date 2010-01-01
Year available 2010
Sub-type Article (original research)
DOI 10.1614/WS-D-09-00071.1
Volume 58
Issue 4
Start page 374
End page 380
Total pages 7
Place of publication Lawrence, KS United States
Publisher Weed Science Society of America
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
1110 Nursing
Abstract Weedy rice is a serious weed of cultivated rice in most of the rice-growing areas of the tropics and yet, despite its importance as a weed, limited information is available on its biology in Asia. A study was conducted to determine the seed characteristics and growth response to competition of weedy rice variants from five Asian countries (India IWR, Malaysia MWR, Philippines PWR, Thailand TWR, and Vietnam VWR) when grown alone or with either 4 or 12 cultivated rice ('IR72') plants. Seed characteristics including weight, length, width, and presence and length of awn differed between weedy rice variants. PWR had the heaviest seed (25 mg seed-1). Growth of weedy rice plants differed among variants and, generally, VWR grew the fastest. IR72 interference greatly reduced tiller and leaf numbers, leaf area, and shoot biomass of all weedy rice variants. At 8 wk after sowing, for example, shoot biomass of weedy rice variants in competition with 12 IR72 plants was 13 to 30 of that where plants were grown alone. TWR plants were shorter than those of other variants at all levels of crop interference. These results show that there are considerable differences among Asian weedy rice variants and yet, competition from the rice crop greatly suppresses weedy rice growth. This suggests that measures to ensure a competitive crop should be an important component of control strategies. Nomenclature: Weedy rice, Oryza sativa f. spontanea L. ORYSA; rice, Oryza sativa L. 'IR72'.
Keyword Biomass
Leaf area
Shoot biomass
Weedy rice seed
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 15 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sat, 12 Jul 2014, 04:56:56 EST by System User on behalf of Centre for Plant Science