Anatomy, Growth and Survival of a Long-hypocotyl Mutant of Cucumis sativus Deficient in Phytochrome B

Casal, Jorge J.; Ballaré, Carlos L.; Tourn, M.; Sánchez, Rodolfo A.

doi:10.1006/anbo.1994.1071

Cited by 54 publications

(44 citation statements)

References 20 publications

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“…Jacknifed standard errors are provided in parenthesis. Values provided in bold are significant at a = 0.05 PL petiole length, PD petiole diameter, LL leaf length, LW leaf width, SD shoot diameter, LA leaf area, Height plant height, LN leaf number, LM leaf mass, RM root mass, TM total mass, SLA specific leaf area availability, particularly in response to shading by neighbours, appears common in many species of terrestrial plants (Casal et al 1994;Ballaré et al 1995Ballaré et al , 1997Smith 1982;Smith and Whitelam 1997). Shaded plants experience a reduced red to far-red light ratio compared with individuals exposed to full sun (Smith 1982;van Hinsberg and van Tienderen 1997).…”

Section: Discussionmentioning

confidence: 99%

“…Shaded plants experience a reduced red to far-red light ratio compared with individuals exposed to full sun (Smith 1982;van Hinsberg and van Tienderen 1997). This cue for light competition triggers a cascade of phenotypic responses including an increase in functional traits such as petiole length, leaf length and width, SLA and height and a decrease in traits such as stem diameter, root mass and the number of leaves produced (Casal et al 1994;Ballaré et al 1995Ballaré et al , 1997Smith 1982;Smith and Whitelam 1997). The contribution of each plant trait to PC2 (see Table 1) suggests that the response shown by L. bonariense to a low light environment is largely consistent with this typical shade avoidance syndrome.…”

Section: Discussionmentioning

confidence: 99%

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The plasticity of phenotypic integration in response to light and water availability in the pepper grass, Lepidium bonariense

2010

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Organisms that live in a heterogeneous environment face a number of important challenges. On one hand, they require the flexibility to respond to environmental conditions and change their phenotype accordingly. On the other, they are required to be robust in their overall body plan to ensure an integrated, functional organism. Here, we examine the relationship between phenotypic plasticity and integration in the common peppergrass, Lepidium bonariense, by examining the multivariate response of a series of functional traits to a combination of light and water treatments. Lepidium bonariense displayed considerable variation in phenotype in response to water and light availability with the extraction of the first two principal components retaining 85% of the total variation in our data set. Principal component 1 (PC1) largely reflects the negative genetic correlation between specific leaf area and overall plant size, whereas PC2 was typical of a shade-avoidance syndrome displayed by many species of vascular plants. Both PC1 and PC2 exhibited considerable variation among genotypes in phenotypic plasticity in response to the combined effect of light and water availability. Despite complex plasticity in this species, we demonstrate that variation in light and water availability did not significantly influence patterns of functional trait integration, with the genetic variance-covariance matrix remaining stable across environments.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The plasticity of phenotypic integration in response to light and water availability in the pepper grass, Lepidium bonariense

2010

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“…DELLA proteins by both the receptors to strengthen the response after obtaining contingent information is also another point showing similarity between phytochrome and UV-B mediated signalling. Several researchers [130,131,132] have also suggested that entailing fitness cost under low R:FR might have led UVR8 to control the responses under canopy. All these similarities suggests towards the evolution of complex photoreceptor UVR8 from the other photoreceptors and thus, there is need of finding the missing link.…”

Section: Accepted Manuscriptmentioning

confidence: 96%

Photoreceptors mapping from past history till date

Parihar¹,

Singh²,

Singh³

et al. 2016

Journal of Photochemistry and Photobiology B: Biology

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“…The rate of extension growth decreases when the upper region of the hypocotyl becomes exposed to light. A refined adjustment of hypocotyl length is important because if it is too short the foliage can be easily covered even by weak disturbances of the soil and if the hypocotyl is too long the shoot can be damaged by the excessive exposure to wind impact (Casal et al, 1994).…”

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confidence: 99%

Cryptochrome as a Sensor of the Blue/Green Ratio of Natural Radiation in Arabidopsis

et al. 2010

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Green light added to blue light has been proposed to shift cryptochromes from their semireduced active form to the reduced, inactive state. Whether the increased proportion of green light observed under leaf canopies compared to open places reduces cryptochrome-mediated effects remained to be elucidated. Here we report that the length of the hypocotyl of Arabidopsis (Arabidopsis thaliana) seedlings grown under controlled conditions decreased linearly with increasing blue/green ratios of the light within the range of ratios found in natural environments. This effect was stronger under higher irradiances. We developed a model, parameterized on the basis of field experiments including photoreceptor mutants, where hypocotyl growth of seedlings exposed to different natural radiation environments was related to the action and interaction of phytochromes and cryptochromes. Adding the blue/green ratio of the light in the term involving cryptochrome activity improved the goodness of fit of the model, thus supporting a role of the blue/green ratio under natural radiation. The blue/ green ratio decreased sharply with increasing shade by green grass leaves to one-half of the values observed in open places. The impact of blue/green ratio on cryptochrome-mediated inhibition of hypocotyl growth was at least as large as that of irradiance. We conclude that cryptochrome is a sensor of blue irradiance and blue/green ratio.

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Anatomy, Growth and Survival of a Long-hypocotyl Mutant of Cucumis sativus Deficient in Phytochrome B

Cited by 54 publications

References 20 publications

The plasticity of phenotypic integration in response to light and water availability in the pepper grass, Lepidium bonariense

The plasticity of phenotypic integration in response to light and water availability in the pepper grass, Lepidium bonariense

Photoreceptors mapping from past history till date

Cryptochrome as a Sensor of the Blue/Green Ratio of Natural Radiation in Arabidopsis

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