Stimulation of Germination of Monochoria vaginalis Seeds by Seed Coat Puncture and Cotylenins.

Takeuchi, Yoshinori; Sassa, T.; Kawaguchi, Shun; Ogasawara, M.; Yoneyama, Koichi; Konnai, Makoto

doi:10.3719/weed.40.221

Cited by 11 publications

(18 citation statements)

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“…The germination of Monochoria seeds requires light and anaerobic conditions that can be replaced by either seedcoat incision or by cotylenin treatment (Takeuchi et al . ). Ethylene also can mimic anaerobic conditions (Momonoki ; Takeuchi et al .…”

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confidence: 97%

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Mechanism of the rice hull‐induced germination of Monochoria vaginalis seeds in darkness

Yokota

Handa

Yamada

et al. 2014

Weed Biology and Management

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The seeds of Monochoria vaginalis require light to germinate. However, they are able to germinate in darkness in the presence of rice hulls. The mechanism of this phenomenon was investigated in this study, in which only the unsterilized seeds of Monochoria were induced to germinate by the presence of a rice hull extract. The rice hull extract was able to be replaced by either a mixture of amino acids and phosphate or a yeast extract. The culture media in which germination was observed always showed turbidity, indicating the propagation of bacteria, which were identified as Bacillus sp., Pedobacter sp., Pantoea sp. and Sphingomonas sp. Treatment with the individual bacterial species or combinations of these bacteria induced Monochoria seed germination when added to the media containing the rice hull extract. It was concluded that the rice hull extract accelerates the propagation of bacteria, which in turn digest the seed coat of Monochoria, facilitating its germination.

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confidence: 97%

“…Ethylene also can mimic anaerobic conditions (Momonoki ; Takeuchi et al . ). However, these events provide no indication as to the underlying mechanisms that result in the successful emergence of Monochoria seedlings in the paddy field.…”

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confidence: 97%

Mechanism of the rice hull‐induced germination of Monochoria vaginalis seeds in darkness

Yokota

Handa

Yamada

et al. 2014

Weed Biology and Management

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“…Therefore, this research excluded the possible role of rice hulls and dehulled rice, and indicated that the germinating rice seeds play a critical role in promoting germination of Monochoria. Takeuchi et al [16] proved that germination of Monochoria required light and flooded condition, but suggested that ethylene stimulated seed germination only in the light by increasing the embryo growth potential which is then high enough to overcome the mechanical restriction of the seed coat. The use of rice exudates from germinating rice at 2-20 seed density showed germination promotion, however, it was not examined whether ethylene or ethephon, an ethylene-releasing substance [17], was whether contained in the exudates.…”

Section: Discussionmentioning

confidence: 99%

“…An amount of 100 rice seeds was immersed in 100 ml distilled water in a glass beaker for 2,4,6,8,10,12,14,16,20, and 22 days in the growth chamber. The exudates were filtered by filter papers and an aliquot of 10 ml of the extracts was put into a 9 cm diameter Petri dish with 10 seeds of Monochoria.…”

Section: Effects Of Exuding Duration Of Rice Seeds On Germination Andmentioning

confidence: 99%

“…Ethylene or its derivative ethephon released from germinating rice seeds and immersed seed coats of barnyardgrass and Monochoria may play a critical role in inducing germination of Monochoria, however experiments for germination were conducted in darkness, therefore it needs to elaborate whether it is true that ethylene is inactive to germination of Monochoria, as suggested by Takeuchi et al [16]. Bacteria may also available in the seed coats of barnyardgrass and Monochoria and may play a role in the germination promotion of the weed as reported in Yokota et al (2014) [10].…”

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Factors Promote Germination and Initial Growth of <i>Monochoria vaginalis</i>

Xuan

Anh

Minh

et al. 2016

ILNS

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The purpose of study was conducted to examine factors that influence on germination of Monochoria vaginalis, a major and problematic weed in paddy fields. It was found that seed coats of barnyardgrass and Monochoria itself strongly promoted germination of Monochoria seeds. Germinating rice seeds caused germination induction of Monochoria, but dehulled rice and rice hulls did not play a role. In general, rice root exudates from 2 to 22 day after germination did not exert significant influence on germination and initial growth of Monochoria. The increase of rice seeds showed no remarkable impact on germination, root length and shoot length of Monochoria. In conclusion, it is suggested that coats of weed seeds, residues of rice and other plants in paddy fields may play a critical role in promoting germination of Monochoria seeds. Therefore, the incorporation of these residues in paddy fields may provide negative impact to weed control as germination of Monochoria is much accelerated.

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