The response of <i>Cuscuta planiflora</i> seedlings to red and far‐red, blue light and end‐of‐day irradiations

Haidar, M.; Orr, Gregory L.

doi:10.1111/j.1744-7348.1999.tb05242.x

Cited by 13 publications

(36 citation statements)

References 14 publications

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“…Because far-red light promotes tight coiling of Cuscuta spp. (Haidar and Orr, 1999), two incandescent 75-W bulbs (75A/CL/DL/RP 120V; Orsam Sylvania) per 15 pots in 30-cm 3 50-cm flats were placed 1 m above plants and left on for 24 h (off for 8 h of scotophase). Using this setup, C. pentagona seedlings coiled tightly around the tomato seedlings within 6 h and haustorial swellings at points of contact with the host were evident within 24 h. Control plants received the same treatment, and plants exposed to incandescent light for this short period showed no noticeable physiological effects.…”

Section: Pentagona Attachment and Growth On Tomatomentioning

confidence: 99%

Parasitism by Cuscuta pentagona Attenuates Host Plant Defenses against Insect Herbivores

2007

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Considerable research has examined plant responses to concurrent attack by herbivores and pathogens, but the effects of attack by parasitic plants, another important class of plant-feeding organisms, on plant defenses against other enemies has not been explored. We investigated how attack by the parasitic plant Cuscuta pentagona impacted tomato (Solanum lycopersicum) defenses against the chewing insect beet armyworm (Spodoptera exigua; BAW). In response to insect feeding, C. pentagona-infested (parasitized) tomato plants produced only one-third of the antiherbivore phytohormone jasmonic acid (JA) produced by unparasitized plants. Similarly, parasitized tomato, in contrast to unparasitized plants, failed to emit herbivore-induced volatiles after 3 d of BAW feeding. Although parasitism impaired antiherbivore defenses, BAW growth was slower on parasitized tomato leaves. Vines of C. pentagona did not translocate JA from BAW-infested plants: amounts of JA in parasite vines grown on caterpillar-fed and control plants were similar. Parasitized plants generally contained more salicylic acid (SA), which can inhibit JA in some systems. Parasitized mutant (NahG) tomato plants deficient in SA produced more JA in response to insect feeding than parasitized wild-type plants, further suggesting cross talk between the SA and JA defense signaling pathways. However, JA induction by BAW was still reduced in parasitized compared to unparasitized NahG, implying that other factors must be involved. We found that parasitized plants were capable of producing induced volatiles when experimentally treated with JA, indicating that resource depletion by the parasite does not fully explain the observed attenuation of volatile response to herbivore feeding. Collectively, these findings show that parasitic plants can have important consequences for host plant defense against herbivores.

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Section: Pentagona Attachment and Growth On Tomatomentioning

confidence: 99%

Parasitism by Cuscuta pentagona Attenuates Host Plant Defenses against Insect Herbivores

2007

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“…A mixture of red and far-red or blue and far-red light promoted coiling and prehaustoria development (Haidar et al, 1997). Coiling and prehaustoria were observed when estimated in vivo Pfr/Ptotal at photoequilibrium (φ) was between 0.06 and 0.67 (Haidar & Orr, 1999). Different families of photoreceptors have evolved in higher plants, including phytochromes (Quail et al, 1995), the blue/ultraviolet-A photoreceptors or cryptochromes (Cashmore et al, 1999), phototropin (a photoreceptor that mediates phototropism) and unidentified ultraviolet-B photoreceptors (Christie et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Characterisation of the interaction between cryptochromes and phytochromes in blue light‐induced coiling and prehaustoria development of dodder (Cuscuta campestris) seedlings

Haidar

2003

Annals of Applied Biology

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Previous studies demonstrated that blue, near far-red and a mixture of red and far-red light stimulate, while red light inhibits coiling and prehaustoria development in young excised de-etiolated dodder seedlings. In this study, evidence was obtained for the involvement of cryptochromes in the mediation of coiling and prehaustoria development in response to blue light. The results indicated that coiling and prehaustoria are affected by the addition of red or far-red light and therefore are dependent on the state of phytochromes. Results also suggest the occurrence of a synergistic interaction between phytochromes (Pr) and cryptochromes and an antagonistic interaction between phytochromes (Pfr) and cryptochromes in mediating coiling and prehaustoria development. Gabaculine significantly reduced coiling and prehaustoria development under far-red or a mixture of red and far-red light but not under blue or a mixture of blue and far-red light, indicating that cryptochromes are involved in blue-induced coiling and prehaustoria development.

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“…End of day (EOD) light quality treatment was studied as an eff ective method to control stem and hypocotyl elongation (Bloom 1995;Hatt Grahamm, Decoteau 1997;Haidar, Orr 1999;Chia, Kubota 2010). Due to the low light intensity requirement and recently increasing availability of lighting emitting diodes (LED), EOD light quality treatment may be an economically feasible, non-chemical means to control plant morphology in which EOD-red (R, 600-700 nm wavelength) and far-red (FR, 700-800 nm) light treatments can reduce and enhance the stem/hypocotyl elongation rate, respectively (Yang et al 2012).…”

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Effect of short-term exposure to red and blue light on dill plants growth

Frąszczak

2013

Hortic. Sci.

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Eff ect of the end-of-day and the end-of-night red and blue light in dill growth was investigated. Ambrozja dill (Anethum graveolens L.) cvs were grown in vegetation chambers in completely controlled conditions exposed to white diode light. Red and blue light was employed for 30 min before the initiation or after the end of the lighting period. Th e values of plant fresh mass, area and height parameters were the highest for plants treated with red light at the end of night. Th e application of red light at the end of day exerted a similar eff ect on plants as the exposure of plants to blue light at the end of night. Plants treated with blue light at the end of the lighting period were characterised by the poorest growth rate. Plants additionally lighted with blue light were found to have both distinctly smaller mass as well as area in comparison with plants exposed to red light. Both methods are useful to control the plants growth depending on the phase of plant development and growers' requirements.

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The response of Cuscuta planiflora seedlings to red and far‐red, blue light and end‐of‐day irradiations

Cited by 13 publications

References 14 publications

Parasitism by Cuscuta pentagona Attenuates Host Plant Defenses against Insect Herbivores

Parasitism by Cuscuta pentagona Attenuates Host Plant Defenses against Insect Herbivores

Characterisation of the interaction between cryptochromes and phytochromes in blue light‐induced coiling and prehaustoria development of dodder (Cuscuta campestris) seedlings

Effect of short-term exposure to red and blue light on dill plants growth

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