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Shattering habit and dormancy of spikelets in a cultivated form of Echinochloa oryzicola recently found in China
Author(s) -
T. Hirosue,
Yuji Yamasue,
Tomosaburo Yabuno
Publication year - 2000
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1046/j.1365-3180.2000.00199.x
Subject(s) - dormancy , biology , habit , weedy rice , germination , seed dormancy , botany , echinochloa , agronomy , weed , oryza sativa , psychology , biochemistry , gene , psychotherapist
Shattering habit and dormancy of spikelets were studied in a cultivated form of Echinochloa oryzicola , which was found in 1994 in the Yunnan Province of China, and compared with a weedy form of the same species. Spikelet weight of the cultivated form (8.3 mg) was nearly twice as large as that of the weedy form. The weedy form developed abscission layers in the spikelet rachis before detachment, but the cultivated form developed no particular structures at a comparable region of the spikelet rachis. The spikelet shattering percentage in the cultivated form was 4.2% at 80 days after heading, compared with 99.8% in the weedy form. Spikelets of the cultivated form, collected in the field at 60 days after heading, showed 96.3% germination in the laboratory at 20/30 °C in the light, and vivipary of the spikelets was observed in the field after persistent rainfall. The weedy form showed only 0.1% germination in the laboratory when collected at 60 days after heading, but this increased to 55% after 100 days of dry storage. We concluded that the cultivated form of E. oryzicola examined in the present study was characterized by large spikelets with non‐shattering habit and no innate dormancy.