Germination of lettuce (Lactuca sativa L.) seed is regulated by phytochrome. The requirement for red light is circumvented by the application of gibberellin (GA). We have previously shown that the endogenous content of GA1, the main bioactive GA in lettuce seeds, increases after red-light treatment. To clarify which step of GA1 synthesis is regulated by phytochrome, cDNAs encoding GA 20-oxidase...

Seed thermoinhibition (inhibition of germination at warm temperatures) can reduce seedling emergence and stand establishment of cultivated lettuce (Lactuca sativa L.) when soil temperatures are warm (>25°C) at planting. Genetic variation for high temperature germination tolerance exists among accessions of lettuce and related wild species. Seeds of a L. serriola accession (UC96US23) germinated ...

background anxiety is a physiological state characterized by cognitive, somatic, emotional, and behavioral components. there is some evidence in traditional medicine for the effectiveness of lettuce (lactuca sativa) in the treatment of anxiety in humans. objectives the present study investigated the effects of a hydro-alcoholic extract of lettuce on rat behavior in the elevated plus-maze (epm) ...

A combination of salicylhydroxamic acid (SHAM) + cyanide (CN) is known to stimulate dark germination of Lactuca sativa L. seeds. Further studies were done to characterize SHAM and CN action in stimulating dark germination of lettuce seed. Germination was stimulated slightly by either SHAM or CN, whereas when SHAM and CN were combined germination was greatly enhanced. Treatment of seeds with ...

We have isolated five endophytic fungi from the roots of Capsicum annuum, Cucumis sativus and Glycine max. The culture filtrates (CF) of these endophytes were screened on dwarf mutant rice (Waito-C) and normal rice (Dongjin-byeo). Endophyte CAC-1A significantly inhibited the growth of Waito-C and Dongjin-byeo. Endophyte CAC-1A was identified as Paraconiothyrium sp. by sequencing the ITS rDNA re...

We have identified through bioassay guided isolation an allelochemical, eudesmane-type sesquiterpeniod, 3beta-caffeoxyl-beta1,8alpha-dihydroxyeudesm-4(15)-ene (1), from an endemic plant species growing in the Himalayas. In our search for the bioactive subfraction, the hexane one was highly significant, showing 100% inhibition of lettuce seed growth at 100 ppm while other subfractions (chlorofor...

Auxins, such as indole-3-acetic acid (IAA), are important in plant germination and growth, while physiological polyamines, such as putrescine, are involved in cell proliferation and differentiation, and their concentrations increase during germination. In this work, novel indole amides were synthesized in good yields by monoacylation of morpholine and unprotected symmetrical diamines with indol...

Various chemicals were applied to dry seeds by means of organic solvents. The gibberellic acid-treated (1 mm) lettuce seeds (Lactuca sativa L.) germinated nearly 100% in the dark even after prolonged storage, and those treated with abscisic acid (1 mm or 0.5 mm) failed to germinate in the light. The seedlings emerging from morphactin-treated (1 mm) cucumber seeds (Cucumis sativus L.) exhibited ...

Abstract The objective of this work was to assess the genetic control tolerance thermoinhibition in lettuce (Lactuca sativa) seeds. Seeds F1, F2, and F2:3 generations derived from cross between cultivars Everglades (tolerant thermoinhibition) Verônica (sensitive were used, besides seeds parents. Seed germination tests conducted a completely randomized design, with four replicates each parent, e...