LEVELS OF MAYSIN AND MAYSIN ANALOGS IN SILKS OF MAIZE GERMPLASM

被引:66
作者
SNOOK, ME
GUELDNER, RC
WIDSTROM, NW
WISEMAN, BR
HIMMELSBACH, DS
HARWOOD, JS
COSTELLO, CE
机构
[1] INSECT BIOL & POPULAT MANAGEMENT RES LAB, TIFTON, GA 31793 USA
[2] USDA ARS, RUSSELL RES CTR, PLANT STRUCT & COMPOSIT RES UNIT, ATHENS, GA 30613 USA
[3] UNIV GEORGIA, DEPT CHEM, ATHENS, GA 30602 USA
[4] MIT, DEPT CHEM, CAMBRIDGE, MA 02139 USA
关键词
D O I
10.1021/jf00033a024
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Maysin [2''-O-alpha-L-rhamnosyl-6-C-(6-deoxy-xylo-hexos-4-ulosyl)luteolin], the resistance factor of Zapalote Chico corn (Zea mays L.) silks to the corn earworm (Helicoverpa zea Boddie), was determined by HPLC in the silks of over 600 inbreds, populations, plant introductions (PI), and various unassigned collections. Maysin levels ranged from 0% to 0.9% fresh weight with approximately 19% of both the inbreds and populations containing maysin levels above 0.2%, a level considered to be necessary for resistance, as based on the laboratory bioassay determined level (for larval) of maysin toxicity. Over 25 lines-yielded higher silk maysin than found in Zapalote Chico (0.347%). High levels of 2''-O-alpha-L-rhamnosyl-6-C-(6-deoxy-xylo-hexos-4-ulosyl)apigenin (apimaysin) were found in inbred NC7, while Tx501 contained appreciable amounts of 2''-O-alpha-L-rhamnosyl-6-C-(6-deoxy-xylo-hexos-4-ulosyl)-3'-methoxyluteolin (3'-methoxymaysin). Spectral data (C-13 NMR and FAB-MS) are given for the characterization of maysin, apimaysin, and 3'-methoxymaysin.
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页码:1481 / 1485
页数:5
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