Germination of Light-Inhibited Seed of Nemophila insignis

Chen, Shepley S. C.

doi:10.2307/2440738

Cited by 11 publications

(12 citation statements)

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“…Similar conclusions were reached with respect to photoperiod by Wareing (1957, 1960), and Chen (1968) demonstrated that seed germination was inversely proportional to light intensity at 13 °C. Chen ( 1968) also found that at a given light intensity seed germination decreased with increased temperature.…”

Section: Response To Lightmentioning

confidence: 82%

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The Adaptive Nature of Seed Germination in Nemophila Menziesii Aggr.

Cruden¹

1974

Ecology

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Nemophila menziesii aggr, includes three closely—related winter annual plants found in many communities in cismontane California and Oregon. The germination response is adapted to the Mediterranean climate that characterizes the region, i.e., wet winters and dry summers. The seeds germinate in late fall or early winter and are inhibited from germinating during late spring, summer, and early fall by high temperatures, long photoperiods, and low available moisture. Temperature and photoinhibition are proportional to the length of the inhibitory period and, in the case of photoinhibition, to light intensity. In combination these factors interact synergistically to inhibit the germination response. Seeds of all ages are able to germinate but germination of young seed is inhibited at temperatures that do not affect mature seed. Seed maturation is a function of high summer temperatures and aging. Populations from more northern and/or higher—elevation communities require more water and lower temperatures to germinate than more southern and/or lowest—elevation communities. These adaptations reflect the greater precipitation and cooler temperatures of the former sites as compared to the latter sites. The ecological parameters and germination responses change gradually both latitudinally and elevationally; hence the adaptations are ecoclinal in nature.

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Section: Response To Lightmentioning

confidence: 82%

“…A light-sensitive "receptor" is located in the micropylar end of the seed coat. Surgical removal of this area results in normal germination in an inhibitory photoperiod (Cruden 1967, Chen 1968).…”

Section: Response To Lightmentioning

confidence: 99%

The Adaptive Nature of Seed Germination in Nemophila Menziesii Aggr.

Cruden¹

1974

Ecology

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“…However, germination rate was significantly greater in the dark than under light conditions 12 months after seed collection, suggesting that light inhibition of seed germination occurred. Light inhibition of seed germination is common in plants (Chen 1968;Felippe 1980;Oliver et al 1983;Hilton 1984). However, the reason for light inhibition when F. qinlingensis seed germination was delayed is unclear and requires further study.…”

Section: Discussionmentioning

confidence: 99%

“…Other bamboo species also display dormancy characteristics, e.g., Bashania fangiana (Camus) Keng et Wen seeds remain dormant for at least 2 years (Taylor and Qin 1988) and F. scabrida seeds remain dormant for up to 5 years (Qin 1985). One factor that represses seed germination is light inhibition of seed germination, which is common in plants (Chen 1968;Felippe 1980;Oliver et al 1983;Hilton 1984).…”

Section: Introductionmentioning

confidence: 99%

Seed germination and seedling growth in the arrow bamboo Fargesia qinlingensis

Wang

Franklin

Cirtain

2006

Ecological Research

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Improving natural regeneration of bamboos after they die following mass flowering is critical for conservation of giant pandas. However, little is known about factors that affect seed germination and seedling growth of bamboos. We studied seed germination and seedling growth in Fargesia qinlingensis, which mass flowered in a giant panda habitat in the Qinling Mountains of China in early 2000, in laboratory and greenhouse conditions. Seed germination rate was tested under light and dark conditions 5 and 12 months after seed collection. Germination rate displayed no significant difference under light or dark conditions 5 months after seed collection, but was significantly greater in the dark than under light 12 months after seed collection, suggesting light inhibition of seed germination. A 2·2 factorial design was conducted to test the effects of nitrogen (N fertilization and non-N fertilization) and light [full sun and shade (i.e., 14% full sun)] on seedling growth and biomass allocation. N fertilization significantly increased seedling growth, resulting in greater seedling height, more branches, more leaves, greater stem biomass, and greater leaf biomass. Seedlings under 14% full sun conditions had a significantly lower percentage of biomass allocated to the stem. The root/shoot ratio was significantly greater in non-N/shade than non-N/full sun, while there was no significant difference in this ratio between N/shade and N/full sun, suggesting that nitrogen fertilization compensated for the effect of shade on biomass allocation. Our results suggest that N fertilization could be employed in restoration of F. qinlingensis stands after die-off following mass flowering.

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“…The germination response ofN. menziesii to light (Black andWareing, 1957, 1960;Rollin and Maignan, 1967) and combinations oflight, temperature and osmotic potential (Chen, 1968;Cruden, 1974) have previously been studied. Highest germination success is achieved in the dark and under low temperatures (0-1 O°C).…”

Section: Studymentioning

confidence: 99%

ENVIRONMENTAL AND GENETIC MATERNAL EFFECTS ON SEED CHARACTERS IN NEMOPHILA MENZIESII

1993

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Nuclear genetic, maternal genetic and maternal environmental effects on seed characters were estimated in the California native annual plant Nemophila menziesii using two greenhouse crosses. In one cross, according to a nested mating design, the narrow sense heritability of seed weight was small (3.9%). A subset of full-sib progenies produced in this cross was grown singly and in competition with the introduced grass Bromus diandrus. In a second cross, these plants were used as mothers (dams) and were each mated to the same three sires. Seeds produced by mothers competing with B. diandrus showed a significant reduction in weight, increase in time to germination, and increase in the incidence of dormancy, when compared to seeds from mothers grown singly. Significant sire components were found for time to germination and incidence of dormancy. Maternal genetic variation for seed weight was largely expressed as maternal genotype by maternal environment interaction, and showed no significant maternal genetic main effect. Time to germination and dormant fraction showed a relatively large maternal genetic effect. Evolution of seed characters in N. menziesii is more likely to occur via indirect response to selection among maternal plants than among the seeds themselves. Maternal genotype by maternal environment interaction could potentially contribute to the maintenance of maternal genetic variation in seed weight, but this does not appear likely for dormancy.

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Germination of Light-Inhibited Seed of Nemophila insignis

Cited by 11 publications

References 0 publications

The Adaptive Nature of Seed Germination in Nemophila Menziesii Aggr.

The Adaptive Nature of Seed Germination in Nemophila Menziesii Aggr.

Seed germination and seedling growth in the arrow bamboo Fargesia qinlingensis

ENVIRONMENTAL AND GENETIC MATERNAL EFFECTS ON SEED CHARACTERS IN NEMOPHILA MENZIESII

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