Temperature and Photocontrol of <i>Onoclea</i> Spore Germination

Towill, Leslie R.

doi:10.1104/pp.62.1.116

Cited by 19 publications

(16 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These seeds show a striking change at 30-32°C of germination under influence of the membrane-associated protein phytochrome in its far-red absorbing form (3). A further example of this type is evident in germination of spores of the fern Onoclea sensibilis Linneaus (6).…”

Section: Discussionmentioning

confidence: 96%

Dependence of thermal responses of seeds on membrane transitions

Hendricks¹,

Taylorson²

1979

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Transitions at 28-320C in membranes of many kinds of seeds influence their germination and subsequent growth. Changes at 28-320C in the rates of loss of endogenous amino acids from imbibed Barbarea verna and Lactuca sativa seeds indicate permeation of the plasma membrane. A transition in the same temperature range is shown by the change in fluorescence with temperature ofsubstituted naphthalenesulfonate probe molecules associated with membrane fragments isolated from the seeds. Some other plant responses that appear to be causally connected with the membrane(s) transition(s) in the 28-320C region are growth of maize seedlings and tomato roots, flowering of some bulbs, and control of seed and fern spore germinations by light. Generality of the control is indicated. Plants and seeds grow best in rather narrow temperature ranges that are well within ultimately limiting high or low values. Thus, germination of many kinds of seeds is best in the 15-300C range and is greatly reduced above 320 C. Sometimes temperature variation is required for optimum response. Seeds commonly show increases in germination when held for short periods at the higher temperatures before being returned to 15-30'C. Plant growth also is often favored by alternation of day and night temperatures. The generality of the seed responses and the narrow range of critical temperatures encourages a search for cause.Correlations between germination and other properties of seeds with critical ranges of temperature change suggest an approach to the subject. Thus, many kinds of seeds imbibed in water have enhanced leakage of sugars (1) and amino acids (2) with increased temperature. The maximum rate of change of these losses often occurs in the 30-32o C range (2). Membrane fragments separated from responsive seeds show changes at 28-320C in the rate of change of fluorescence with temperature of anilinonaphthalenesulfonate probe molecules added to suspensions of the fragments (3). The phenomenon is further examined here. MATERIALS AND METHODSGermination of Barbarea verna (Miller) Aschers (early wintercress, collected locally) and Lactuca sativa Linnaeus cv. Grand Rapids (lettuce, purchased) seeds were measured on lots of 100 seeds at 1PC intervals on a thermogradient plate. Other seeds, including those of Amaranthus retroflexus Linnaeus, were collected locally and held in dry storage at -20'C. Amino acid leakage to ambient solutions was measured as described (2) on seeds held for 4 hr at the various temperatures after imbibition for 16-18 hr at 20'C.Membrane fragments were separated by grinding 0.5 g of imbibed seeds with silica in a mortar at room temperature with three successive 3-ml lots of 2 mM potassium phosphate buffer at pH 7.2. The pellets from centrifuging for 45 min between 3000 X g and 25,000 X g were resuspended in buffer. Narrow fractionation and density gradients were used in one case but not systematically because of the drastic grinding procedure required to disrupt the seed tissues. A solution of a probe compound was added to the...

show abstract

Section: Discussionmentioning

confidence: 96%

Dependence of thermal responses of seeds on membrane transitions

Hendricks¹,

Taylorson²

1979

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…Temperature and its interaction with other environmental factors may modify the response of the pteridophyte spores to light (Towill, 1978;Mahlberg & Yarus, 1977;Ranal, 1983). In many pteridophytes species, such as Onoclea sensibilis (Towill, 1978) and Lygodium japonicum (Tomizawa et al, 1982), germination is induced by a short exposure to red light.…”

Section: Introductionmentioning

confidence: 99%

“…In many pteridophytes species, such as Onoclea sensibilis (Towill, 1978) and Lygodium japonicum (Tomizawa et al, 1982), germination is induced by a short exposure to red light. However, some species need to be exposed to longer light periods for the germination process to occur (Colli, 1996;Esteves et a.l, 1985).…”

Section: Introductionmentioning

confidence: 99%

The effect of red light on the germination of a Brazilian Pteridophyte

Colli

Perez

1999

Braz. arch. biol. technol.

View full text Add to dashboard Cite

show abstract

“…The germination of fern spores and the gametophyte development are strongly controlled by the light, mineral nutrition and temperature. Photosensitive spores need mild temperatures for the inductive processes (Towill 1978, Chen and Ikuma 1979, Haupt 1990, 1991, 1992, Fernández et al 1996. According to Camloh and Gogola (1992) and Camloh (1993Camloh ( , 1999, liquid media are superior to solid media for early gametophyte development.…”

Section: Introductionmentioning

confidence: 99%