Dormancy in Seeds of Charlock: IV. INTERRELATIONSHIPS OF GROWTH, OXYGEN SUPPLY AND CONCENTRATION OF INHIBITOR

“…This inhibitor is apparently produced by the seed coat (testa) (Witcombe, Hiliman and Whittington, 1969) and seems to be present in the seed coat of all seeds in apparently similar quantities (see Edwards, 1968a for a detailed description of seed anatomy). The inhibition is broken down by oxidation (Edwards, 1969) and the effect of the seed coat in dormant seed appears to be to prevent this oxidation taking place by being impermeable to oxygen (Edwards, 1968b). The seed coat is clearly of maternal origin and hence control of dormancy is maternal.…”

Section: Introductionmentioning

confidence: 99%

The inheritance of seed dormancy in Sinapis arvensis L.

Garbutt

Witcombe

1986

Heredity

View full text Add to dashboard Cite

Selection for dormant and non-dormant seed in Sinapis arvensis was carried to the seventh and fourteenth generation, respectively. Crosses between the dormant and non-dormant lines clearly showed both a maternal and an embryonic component of seed dormancy. A model for the number of alleles controlling dormancy was constructed and tested. The maternal component of dormancy was shown to be controlled by a single locus with two alleles, the dormant allele being dominant to the non-dormant. No clear picture of the control of the embryonic component of dormancy was found.

show abstract

“…Gutterman & Evenari, 1969). In Sinapis arven.sis limited oxygen supply to the embryo elicited (he synthesis of cell elongation inhibitors (Edwards. 1969).…”

Section: Introductionmentioning

confidence: 99%

Short soaking in water inhibits germination of Datura ferox L. and D. stramonium L. seeds

1989

View full text Add to dashboard Cite

Summary. Seed coat structures may play a major role in determining the germination of seeds. The involvement of seed coat characteristics in the inhibition of germination observed when dry seeds of Datura ferox L. and D. stramonium L., were rinsed or soaked in water for 1–5 min (‘soaking effect’) was investigated. Germination was inhibited by soaking D. ferox seeds even at late stages of the germination process up to one day before root protrusion. Simulation of the ‘soaking effect’ was achieved by blocking the hilum with lanolin, enamel lacquer or agar during imbibition. Blocking the hilum did not prevent water uptake by the seeds. Seed coat integrity was necessary for the ‘soaking effect’ since germination inhibition was eliminated by removing or cracking the seed coat. Drying the seeds up to 12 h after soaking reversed the inhibitory effect. SEM observations of both species revealed a loose outer parenchymatous tissue covering the hilum, an inner spongy tissue between the nucellus and the hilum and a space between the seed coat and the nucellus. We concluded that during soaking, water is trapped in the space between the seed coat and the nucellus, and in the intracellular spaces of the spongy tissue within the hilum. This water ‘plug’ may limit the diffusion of gas(es) to and from the embryo through the hilum, thus inhibiting germination.

show abstract

Dormancy in Seeds of Charlock: IV. INTERRELATIONSHIPS OF GROWTH, OXYGEN SUPPLY AND CONCENTRATION OF INHIBITOR

Cited by 24 publications

References 16 publications

The Effect of Sodium Hypochlorite, Gibberellic Acid and Light on Seed Dormancy and Germination of Stinkweed and Wild Mustard

The Effect of Sodium Hypochlorite, Gibberellic Acid and Light on Seed Dormancy and Germination of Stinkweed and Wild Mustard

The inheritance of seed dormancy in Sinapis arvensis L.

Short soaking in water inhibits germination of Datura ferox L. and D. stramonium L. seeds

Contact Info

Product

Resources

About