Lettuce Seed Germination: Evidence for a Reversible Light-Induced Increase in Growth Potential and for Phytochrome Mediation of the Low Temperature Effect.

@article{Scheibe1965LettuceSG,
  title={Lettuce Seed Germination: Evidence for a Reversible Light-Induced Increase in Growth Potential and for Phytochrome Mediation of the Low Temperature Effect.},
  author={Joseph Scheibe and Anton Lang},
  journal={Plant physiology},
  year={1965},
  volume={40 3},
  pages={
          485-92
        }
}
Photoblastic germiinlationi in lettuce has been very extensively sttudiedl (7, 17). The process is phytochromiie-miiedliated, that is, brief irradiances with red lighlt (RZ) promote subsequent germiniation, and the red effect is repeatedly reversible by immlliediate reirradliation witlh far-redl light ( F). Some lots of freslylv harvested seed of the variety Grand( Rapids germinate little or Inot at all wihen imlHbibed in the (lark at 260. Dark germiniatioln is someiehat hig-her at lowver… 

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References

SHOWING 1-7 OF 7 REFERENCES
Action of Gibberellic Acid on Lettuce Seed Germination.
TLDR
The following experiments are an attempt to provide answers to questions as to the mechanism of light-controlled germination of seeds which ordinarily require light.
Promiiotion of lettuce see ( d ger - miinationi bv gibberellin
  • Plant Plhvsiol .
  • 1963
Interactioin in growth and germination he - tween thiourea andl indolvacetic aci ( l
  • Ann . Botany N . S
  • 1961
Analysis of germiniation l ) rocesses of lettuce seed by meanis of temperature and ( aniaerobiosis
  • Plant Physiol .
  • 1960
Inihibitioni of flowering in ( lie topodin in en blnin bY prolonge ( l farre ( d ra ( iM - tioli . Botanl
  • 1958
IKU [ MA , H . AND K . V . TmIIMANN . 1959 . Tlhe pho - tosenisitive site in lettuce seeds
  • Scienice