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• W2502255403 abstract "Seed of the angiospermous parasite, witchweed (Striga lutea Lour.), normally germinate poorly or not at all unless adequately pretreated and exposed to a germination stimulant which is obtained from plant root exudates. Under certain conditions, scarification of the seed envelope promoted germination in the absence of the stimulant. With adequately (2-week) pretreated seed, a cut or puncture through the aleurone at the radicular end induced typical germination. A puncture through the aleurone elsewhere on the seed induced little or no germination. A cut through the aleurone at the cotyledon end or centre of the seed induced atypical germination. A puncture through the aleurone elsewhere on the seed induced little or no germination. A cut through the aleurone at the cotyledon end or centre of the seed induced atypical germination in which the radicle elongated but did not penetrate the intact envelope over the radicle. Incubation in oxygen did not promote germination regardless of the site of seed scarification. Ten per cent carbon dioxide reduced the germination of punctured seed. Seed germinated equally well when scarified over the radicle and incubated in air, nitrogen, darkness, or light. Brief treatments with sulphuric acid also induced germination. The softening effect of stimulatory acid treatments upon the aleurone was first evident 6 h later and only occurred at the radicular end of the seed. Indol-3yl-acetic acid inhibited and ethylene stimulated germination of scarified and non-sacrified seed. Gibberellic acid(GA3) had no apparent effect upon nonscarified seed but promoted germination of scarified seed. Inadequately (I-day) or excessively (12- to 16-week) pretreated seed germinated poorly or not at all when treated with the germination stimulant, ethylene, GA3, or sulphuric acid. Some seed germinated slowly when scarified over the radicle, but the germination rates and totals were less than those of scarified seed pretreated for 2 weeks. Additions of stimulant, ethylene or GA3, acelerated the germination rates of scarified but inadequately pretreated seed. Of the treatments tested, only GA3, increased the slow germination of the excessively pretreated scarified seed. Results indicated that the aleurone restrained radicle elongation. Scarification over the radicle removed the restraint and permitted radicle emergence. However, the ability of the radicle to elongate, as influenced by time of seed pretreatment and exogenous stimulant, GA3 or ethylene, determined whether or not the scarified seed germinated." @default.
• W2502255403 created "2016-08-23" @default.
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• W2502255403 date "1972-09-01" @default.
• W2502255403 modified "2023-09-23" @default.
• W2502255403 title "Influence of the Seed Envelope and Growth Regulators Upon Seed Dormancy in Witchweed (Striga lutea Lour.)1" @default.
• W2502255403 doi "https://doi.org/10.1093/oxfordjournals.aob.a084631" @default.
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