A new regeneration medium (SH salts and vitamins, sucrose, agar, IAA, kinetin and zeatin) substantially improved callus induction and shoot regeneration on cotyledons in most cultivars.

indole-3-acetic acid · growth · Lactuca sativa (garden lettuce)Results differ

7 papers in the same direction as this claim · 4 in the opposite direction

1. negative
   Indoleacetic acid and other IAA derivatives inhibited lettuce seed germination and root elongation.

   Inhibition of Lettuce Seed Germination and Root Elongation by Derivatives of Auxin and Reversal by Derivatives of Cycocel · 1966

   Opposite direction

2. negative
   IAA above 10−8 M inhibited root growth.

   Automated Recording of Lettuce Root Elongation as Affected by Auxin and Acid pH in A New Rhizometer with Minimum Mechanical Contact to Roots · 1986

   Opposite direction

3. negative
   IAA at 5 ppm completely inhibited germination of lettuce seeds.

   In vitro Oxidation of Indoleacetic Acid by Crude Enzyme from Rice Husk—An Aspect of Preharvest Sprouting · 1998

   Opposite direction

4. negative
   IAA inhibited lettuce cv. Cabbage seed germination.

   Lettuce Seed Germination: Interaction between Auxin and 2-Chloroethanephosphonic acid (Ethrel) · 1972

   Opposite direction

5. positive
   Indoleacetic acid (IAA) greatly stimulated root initiation in lettuce cotyledon explants.

   Interactions of growth regulators, explant age, and culture environment controlling organogenesis from lettuce cotyledons in vitro · 1984 · compared with Control explants

   Same direction

6. positive
   IAA stimulated lettuce germination in certain cases.

   Interaction in growth and germination between Thiourea and Indolyl Acetic Acid · 1958

   Same direction

7. positive
   Lettuce axillary bud explants grew shoots successfully on MS medium with 1.0 or 2.0 mg litre ‐1 kinetin and IAA.

   Propagation of lettuce (Lactuca sativa) breeding material by tissue culture · 1987

   Same direction

8. positive
   IAA significantly reduced B-9 inhibition of lettuce hypocotyl growth.

   On the interaction of growth retardants with IAA and kinetin · 1969 · compared with B-9, 0.06% solution

   Same direction

3 papers more in this group

sucrose · growth · Lactuca sativa (garden lettuce)Positive and negative results

3 papers in the same direction as this claim · 3 in the opposite direction

1. positive
   The activated charcoal medium achieved the highest frequency and speed of direct shoot organogenesis from cotyledons.

   A rapid and efficient in vitro regeneration system for lettuce (Lactuca sativa L.) · 2017

   Same directionCites this paper

2. negative
   A Hoagland, sodium chloride and sucrose solution at 25 milliosmols inhibited lettuce radicle growth by over 50%.

   Effects of Osmotic Concentration and pH on Plant Growth · 1974

   Opposite direction

3. negative
   Sucrose at 0.05 M brought about about 50% reduction in germination.

   Water Content and the Responsivity of Lettuce Seeds to Light · 1974

   Opposite direction

4. negative
   High concentrations of exogenous sucrose significantly inhibited lettuce growth.

   Promoting Anthocyanin Biosynthesis in Purple Lettuce through Sucrose Supplementation under Nitrogen Limitation · 2024

   Opposite direction

5. positive
   Exogenous sucrose alleviated nitrate stress suppression of lettuce growth.

   Effects of Exogenous Sucrose on Activities of Antioxidant Enzymes of Lettuce under NO_3~-Stress · 2014

   Same direction

6. positive
   Exogenous sucrose alleviated nitrate stress suppression of lettuce growth.

   Effects of Exogenous Sucrose on Growth and Quality of Lettuce under NO_3~- Stress · 2013

   Same direction

kinetin · growth · Lactuca sativa (garden lettuce)Positive and negative results

20 papers in the same direction as this claim · 3 in the opposite direction

1. no effect
   Kinetin could not reverse mannitol-imposed osmotic dormancy.

   Reversal of Induced Dormancy in Lettuce by Ethylene, Kinetin, and Gibberellic Acid · 1977

   Opposite direction

2. no effect
   Kinetin used alone was not effective in improving lettuce emergence.

   Emergence at High Temperature and Seedling Growth Following Pretreatment of Lettuce Seeds with Fusicoccin and Other Growth Regulators · 1986

   Opposite direction

3. negative
   Kinetin inhibited lettuce root growth.

   Post-germination Root Growth in Lettuce: Role of Ethylene under Saline and Nonsaline Conditions · 1988

   Opposite direction

4. positive
   Kinetin completely overcame the inhibition by abscisin II of seed germination and seedling growth in dark and light.

   Reversal of (±) ‐Abscisin II Induced Inhibition of Lettuce Seed Germination and Seedling Growth by Kinetin · 1968 · compared with abscisin II

   Same direction

5. positive
   At 35 C, kinetin permitted lettuce germination at 0 and —1.1 bars.

   WATER POTENTIAL, TEMPERATURE, AND KINETIN EFFECTS ON SEED GERMINATION IN SOIL AND SOLUTE SYSTEMS · 1970

   Same direction

6. positive
   Kinetin and ACC relieved salt stress on lettuce seed germination.

   Synergistic Enhancement of Ethylene Production and Germination with Kinetin and 1-Aminocyclopropane-1-Carboxylic Acid in Lettuce Seeds Exposed to Salinity Stress · 1988

   Same direction

7. positive
   GA3 plus kinetin promoted germination by 50 to 100%.

   Requirement for Ethylene Synthesis and Action during Relief of Thermoinhibition of Lettuce Seed Germination by Combinations of Gibberellic Acid, Kinetin, and Carbon Dioxide · 1986 · compared with controls

   Same direction

8. positive
   Kinetin markedly relieved 35 C inhibition of lettuce seed germination.

   Additive and Synergistic Effects of Kinetin and Ethrel on Germination, Thermodormany, and Polyribosome Formation in Lettuce Seeds · 1975 · compared with inhibition of germination

   Same direction

15 papers more in this group