Effects of Daylength and Temperature on the Reproduction of Vaucheria sessilis

League, Elizabeth A.; Greulach, Victor A.

doi:10.1086/335889

Cited by 23 publications

(10 citation statements)

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“…League & Greulach, 1955) the primary response to daylength has been shown to be a growth response which has, in turn, caused the onset of reproductive activity. League & Greulach, 1955) the primary response to daylength has been shown to be a growth response which has, in turn, caused the onset of reproductive activity.…”

Section: Resultsmentioning

confidence: 99%

Effects of Daylength on Growth and Reproduction of the Conchocelis-Phase of Porphyra Tenera

Dring

1967

J. Mar. Biol. Ass.

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The conchocelis-phase of Porphyra tenera Kjellman has been grown in in vitro culture, and subjected to a variety of daylength treatments.Details of the culture apparatus designed for these treatments are given, and quantitative techniques, which have been devised for estimating the growth and reproduction of the alga, are described and discussed.Growth was found to be directly proportional to daylength within the range 8-16 h, but abundant sporangia were only formed in daylengths of 10 h or less. The interruption of a 16 h dark period by 1 h of light completely inhibited the production of sporangia, but exposure to 8 short-day cycles, followed by long days, induced the formation of as many sporangia as were found after 25 short days. These results are discussed with reference to the photoperiodic responses of flowering plants.

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Section: Resultsmentioning

confidence: 99%

Effects of Daylength on Growth and Reproduction of the Conchocelis-Phase of Porphyra Tenera

Dring

1967

J. Mar. Biol. Ass.

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“…Some data on light and nutrient requirements for culturing Vaucheria and a few other xanthophyte algae have been published (League and Greulach, 1955;Schneider et al, 1993;Schneider et al, 1999). Vaucheria species tend to grow well in culture at 10 to15°C (the authors, unpublished data) and collections in the field are often most successful between fall and late spring; collections have even been made from under ice.…”

Section: Table 1 Overview Of Genera Of Xanthophytes Treated In This Cmentioning

confidence: 99%

“…Vegetative samples of Vaucheria may have to be placed in covered finger bowls or culture dishes, covered with water taken from the collection site or culture media (Provasoli, 1968), and kept in a growth chamber at 10-15°C. A longer photoperiod (approximately 18 hours of light) appears to induce gametogenesis more quickly (League and Greulach, 1955;Schneider et al, 1993). Often, species of Vaucheria collected from running water will produce zoospores during the early morning hours for the next two to three days after making the collection.…”

Section: Collection and Preparation For Identificationmentioning

confidence: 99%

Xanthophyte, Eustigmatophyte, and Raphidophyte Algae

Ott

Oldham-Ott

Rybalka

et al. 2015

Freshwater Algae of North America

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“…Zygotes of a brown alga Xpermatoehnus paradoxus germinated equally well a t temperatures of 20 and 9 "C (MULLER 1981). On the other hand, LEAGUE and GREULACH (1955) reported that low temperatures between 12 and 15 "C were more favourable for oospore germination of Vaucheria scsselis than high temperatures of 21 -27 "C.…”

Section: (Proctor 1967)mentioning

confidence: 99%

Effects of different factors on the akinete germination of Pithophora oedogonia (Mont.) Wittrock

Agrawal

1986

J. Basic Microbiol.

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The present study focuses on the effects of different kinds of visible light, the intensities of white light, temperature and p H on akinete germination in the green alga Pithophora oedogonia (MoNT.)WITTROCK. In addition, it was studied how different kinds of visible light applied during akinete formation influenced the subsequent germination in white light. Akinetes initiated to germinate 3 days earlier in blue and green light than in yellow, red and white light. The green light was most favourable to akinete germination, while red light had a poor effect. No photoreversible effect of red and green light was observed. Akinetes formed under green, blue and yellow light germinated quickly and showed a higher percentage of germination than those formed under red light. Germination of akinetes was initiated even when kept in total darkness. Germination of akinetes was favoured in white light a t intensities between 0.50 and 1.5 Klux. Maximum germination of akinetes occurred a t 25 "C, while progressively higher and lower temperature suppressed germination of akinetes a t different levels. Initiation of akinete germination was delayed a t a pH of 7 and 8. No germination of akinetes was observed a t a pH of 9 and 10.Very little information is available on the conditions which control spore germination in green algae. It has been reported that the presence of light is required for spore germinat,ion of Oedogonium foveolatum ( HOFFMANN 1965) and Chura sp. (PROCTOR 1967). AGRAWAL (1980) studied the effects of different kinds of light, intensities of white light, temperature and pH on the akinete germination of Stigeoclw~ium pmcheri. The present study reports the effects of variations in the type and intensity of light, temperature and p H on akinet,e germination in the green alga Pithophora oedogonia (MoNT.) W~TTROCK. In addition, it was studied how different kinds of visible light applied during akinete formation influenced t,he subsequent germination in white light. Materials and methodsThe alga was collected from a freshwater pond a t the University Campus. Clonal cultures were raised from single germinating akinete, maintained in BOLD'S basal medium (COX and BOLD 1966) a t 22 f 1 "C and illuminated with day light fluorescent tubes a t an intensity of 2 Klux for 16 hrs B day. The pH of medium was adjusted to 7.5. The alga reproduced itself by the formation of akinetes which appeared 5 days after inoculation of filaments and which required another 10 days for maturation. The akinetes harvested from basal medium were transferred to fresh medium end germinated directly into new filaments. The initiation of akinete germination was evident by a change in colour to light green and subsequent formation of a small protuberance. The emergence of protuberances originating from the wall of the akinete which subsequently developed into a germling was taken as a criterion for germination.The akinete germination was not synchronous in P. oedogonia. In control cultures about 21% of the akinetes initiated to germinate on the fifth d...

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Effects of Daylength and Temperature on the Reproduction of Vaucheria sessilis

Cited by 23 publications

References 0 publications

Effects of Daylength on Growth and Reproduction of the Conchocelis-Phase of Porphyra Tenera

Effects of Daylength on Growth and Reproduction of the Conchocelis-Phase of Porphyra Tenera

Xanthophyte, Eustigmatophyte, and Raphidophyte Algae

Effects of different factors on the akinete germination of Pithophora oedogonia (Mont.) Wittrock

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