Dormancy in bulbils of several herbaceous plants: Effects of photoperiod, light, temperature, oxygen and gibberellic acid

Okagami, Nobuo

doi:10.1007/bf02488300

Cited by 15 publications

(6 citation statements)

References 15 publications

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“…Reduced ventilation extended dormancy in yams, possibly because lower oxygen concentrations would decrease the metabolic rate of the yam tubers (Ajayi and Madueke, 1990). In D. opposita bulbils, however, a concentration of less than 10% O 2 in N 2 was eective in breaking dormancy (Okagami, 1979). Similar ®ndings have been made with potato tubers where reduced oxygen concentration (Burton, 1989) and an atmosphere enriched in carbon dioxide (Reust and Gugerli, 1984) were eective in breaking dormancy.…”

Section: Physical Interventionmentioning

confidence: 71%

“…This hastening of development may have been due to the leaching of putative`sprouting inhibitors' (Gupta et al, 1979). Similarly, reducing oxygen concentration in the air to below ambient values also broke dormancy in bulbils of D. opposita (Okagami, 1979). Barker (1998), however, soaked ®ve clones of D. rotundata in water for 24 or 48 h at ambient temperatures (about 25 8C) and found either no eect or an increase in the duration to sprouting of about 10 d. He also soaked two clones in a water bath at 50 8C for 1 h and this treatment too prolonged dormancy by 15±25 d, an eect he attributed to high temperature and damage to the outer layers of cork cells.…”

Section: Factors Aecting the Duration Of The Dormant Period And Sproumentioning

confidence: 95%

“…Dormancy has also been studied intensively in potato (Coleman, 1987), but it is critically important to remember that potato and yam tubers are botanically very dierent. In yam, some progress has been made in understanding the dormancy mechanism in bulbils, particularly in D. opposita (formerly D. batatas) where both photo-sprouting (in young bulbils) and thermo-sprouting (in dormant bulbils) mechanisms have been identi®ed (Okagami, 1979).…”

Section: Endogenous Control Of Dormancymentioning

confidence: 99%

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Dormancy in Yams

et al. 2001

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The tubers of yam, principally those of Dioscorea rotundata (white Guinea yam) and D. alata (water or greater yam), are important staple foods and sources of carbohydrate in West Africa. Yams are grown in diverse environments ± from the high-rainfall forest zone on the coast to the seasonally arid savannas of West Africa, that is in situations in which the duration and the timing of the onset of the growing season vary appreciably. Dormancy in both underground and aerial tubers of the Dioscoreaceae is an important adaptive mechanism that helps to maintain organoleptic quality during storage and also ensures that tubers germinate at the start of the growing season. Plant breeders are especially keen to manipulate the duration of the dormant period in order to synchronize growth periods and, therefore, to produce more than one generation per year. The control of tuber dormancy, however, is poorly understood. This review examines critically those factors that aect tuber initiation, dormancy and sprouting, and makes recommendations for future priorities in research. 150P. Q. CRAUFURD et al. Figure 2. Growth cycles of four cultivars of D. rotundata grown from tuber pieces in the ®eld in the forest zone of CoÃ te d'Ivoire. The experiment was planted between 15±23 April . From Trouslot (1982.

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Section: Physical Interventionmentioning

confidence: 71%

Section: Factors Aecting the Duration Of The Dormant Period And Sproumentioning

confidence: 95%

Section: Endogenous Control Of Dormancymentioning

confidence: 99%

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Dormancy in Yams

et al. 2001

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“…Specific factors influence the duration and termination of dormancy in bulbs: specific proteins [12,13], changes in the level of gibberellins and abscisic acid [9,[14][15][16][17][18][19], amylasedependent degradation of starch [20][21][22][23], as well as hydration of large molecules and subsequent water release from hydrated molecules [23][24][25][26]. In certain cases, dormancy release leads to an increase in cell division rate [27].…”

Section: Dormancymentioning

confidence: 99%

Bulb Dormancy In Vitro—Fritillaria meleagris: Initiation, Release and Physiological Parameters

Marković

Trifunović‐Momčilov

Uzelac

et al. 2021

Plants

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In ornamental geophytes, conventional vegetative propagation is not economically feasible due to very slow development and ineffective methods. It can take several years until a new plant is formed and commercial profitability is achieved. Therefore, micropropagation techniques have been developed to increase the multiplication rate and thus shorten the multiplication and regeneration period. The majority of these techniques rely on the formation of new bulbs and their sprouting. Dormancy is one of the main limiting factors to speed up multiplication in vitro. Bulbous species have a period of bulb dormancy which enables them to survive unfavorable natural conditions. Bulbs grown in vitro also exhibit dormancy, which has to be overcome in order to allow sprouting of bulbs in the next vegetation period. During the period of dormancy, numerous physiological processes occur, many of which have not been elucidated yet. Understanding the process of dormancy will allow us to speed up and improve breeding of geophytes and thereby achieve economic profitability, which is very important for horticulture. This review focuses on recent findings in the area of bulb dormancy initiation and release in fritillaries, with particular emphasis on the effect of plant growth regulators and low-temperature pretreatment on dormancy release in relation to induction of antioxidative enzymes’ activity in vitro.

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“…Parallel evolution of bulbils. -Many herbaceous plants form bulbils (Okagami, 1979). Bulbils serve as a means of clonal reproduction with the ability to colonize and sequester resources quickly after initial introduction, particularly in isolated populations (Callaghan & al., 1997;Abrahamson, 1980).…”

Section: Discussionmentioning

confidence: 99%

Zhengyia shennongensis: A new bulbiliferous genus and species of the nettle family (Urticaceae) from central China exhibiting parallel evolution of the bulbil trait

Deng

Kim

Zhang

et al. 2013

TAXON

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Zhengyia shennongensis is described here as a new genus and species of the nettle family (Urticaceae) from Hubei province, central China. The phylogenetic position of Z. shennongensis is determined using DNA sequences of nuclear ribosomal ITS and three plastid regions (rbcL, psbA–trnH, trnL–F). Zhengyia shennongensis is readily distinguished from the related genera Urtica, Hesperocnide, and Laportea in the tribe Urticeae by its seed (oblong–globose or subglobose and not compressed achenes, surface densely covered with nipple–shaped protuberances) and stipule morphology (large leaf–like stipules with auriculate and amplexicaulous base and united with stem). Phylogenetic evidence indicates that Zhengyia is a distinct group related to Urtica (including Hesperocnide) species and Laportea cuspidata in tribe Urticeae. The bulbiliferous species of the tribe (L. bulbifera, L. cuspidata, Z. shennongensis) do not form a clade. This result indicates that the bulbil trait evolved in parallel within Urticeae. Our findings highlight the importance of shady and moist habitats in promoting species diversification and the parallel evolution of morphological traits that are likely to be adaptive.

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Dormancy in bulbils of several herbaceous plants: Effects of photoperiod, light, temperature, oxygen and gibberellic acid

Cited by 15 publications

References 15 publications

Dormancy in Yams

Dormancy in Yams

Bulb Dormancy In Vitro—Fritillaria meleagris: Initiation, Release and Physiological Parameters

Zhengyia shennongensis: A new bulbiliferous genus and species of the nettle family (Urticaceae) from central China exhibiting parallel evolution of the bulbil trait

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