Mechanisms and diversity of resistance to sorghum midge, Stenodiplosis sorghicola in Sorghum bicolor

Sharma, H. C., Franzmann, B. A. and Henzell, R. G. (2002) Mechanisms and diversity of resistance to sorghum midge, Stenodiplosis sorghicola in Sorghum bicolor. Euphytica, 124 1: 1-12. doi:10.1023/A:1015634211375


Author Sharma, H. C.
Franzmann, B. A.
Henzell, R. G.
Title Mechanisms and diversity of resistance to sorghum midge, Stenodiplosis sorghicola in Sorghum bicolor
Journal name Euphytica   Check publisher's open access policy
ISSN 0014-2336
Publication date 2002
Sub-type Article (original research)
DOI 10.1023/A:1015634211375
Volume 124
Issue 1
Start page 1
End page 12
Total pages 12
Place of publication Netherlands
Publisher Kluwer
Collection year 2002
Language eng
Subject C1
300204 Plant Protection (Pests, Diseases and Weeds)
620104 Other cereals
0706 Horticultural Production
0703 Crop and Pasture Production
1001 Agricultural Biotechnology
Abstract Sorghum midge, Stenodiplosis sorghicola (Coquillett) is the most important pest of grain sorghum worldwide, and plant resistance is an important component for the control of this pest. To identify sorghum genotypes with diverse mechanisms of resistance to sorghum midge, we studied oviposition, larval survival, and midge damage in 27 sorghum midge-resistant genotypes, and a susceptible check under greenhouse conditions. Observations were also recorded on floral characteristics and compensation in grain mass. Of the 28 sorghum genotypes tested, 19 showed high levels of antixenosis to oviposition as a component of resistance, and had <20% spikelets with eggs when infested with 10 or 25 sorghum midge females per panicle under no-choice conditions in the headcage. Genotypes IS 8887, IS 10712, IS 21873, IS 21881, ICSV 745, and QL 39 showed antibiosis as one of the components of resistance. Lines IS 7005, IS 10712, IS 18563, IS 21873, IS 21881, PM 15936-2, ICSV 197, and ICSV 745 showed <20% spikelets with eggs, larvae, or, midge damaged chaffy spikelets across infestation levels, compared with > 80% midge damaged spikelets in QL 12 - the susceptible check. Genotypes showing resistance to sorghum midge have smaller glumes than the susceptible check, QL 12. However, IS 7005, IS 18653, and ICSV 745 have relatively large sized glumes, but suffered <20% midge damage suggesting that factors other than glume size also contribute to midge resistance in sorghum. Fourteen genotypes showed >20% compensation in grain mass when the panicles were reduced to 250 spikelets and infested with 10 or 25 midges per panicle. There is considerable diversity in sorghum genotypes showing resistance to sorghum midge. Genotypes with diverse combination of characteristics associated with resistance to sorghum midge can be used in breeding programs to broaden the genetic base and increase the levels of resistance to this insect.
Keyword Agronomy
Plant Sciences
Horticulture
Antibiosis
Diversity Of Resistance
Oviposition Nonpreference
Resistance
Resistance Mechanisms
Sorghum Midge
Stenodiplosis Sorghicola
Contarinia-sorghicola
Coquillett Diptera
Grain-sorghum
Cecidomyiidae
Identification
Antixenosis
Component
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Tue, 14 Aug 2007, 18:14:24 EST