A domestication-associated gene, CsLH, encodes a phytochrome B protein that regulates hypocotyl elongation in cucumber

Abstract We report here the interactive effects of three light qualities (white, red and blue) and three growth temperatures (16�C, 22�C and 28�C) on rosette growth, hypocotyl elongation and disease resistance in Arabidopsis thaliana. While an increase in temperature promotes hypocotyl elongation irrespective of light quality, the effects of temperature on rosette growth and disease resistance are dependent on light quality. Maximum rosette growth rate under white, red and blue light are observed at 28�C, 16�C and 22�C, respectively. The highest disease resistance is observed at 16�C under all three light conditions, but the highest susceptibility is observed at 28�C for white light and 22�C for red and blue light. Interestingly, rosette growth is inhibited by phytochrome B (PHYB) under blue light at 28�C and by cryptochromes (CRYs) under red light at 16�C. In addition, disease resistance is inhibited by PHYB under blue light and promoted by CRYs under red light. Therefore, this study reveals a complex interaction between light and temperature in modulating rosette growth and disease resistance as well as the contribution of PHYB and CRY to disease resistance.

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Suppressors of an Arabidopsis thaliana phyB Mutation Identify Genes That Control Light Signaling and Hypocotyl Elongation

Genetics ◽

10.1093/genetics/148.3.1295 ◽

1998 ◽

Vol 148 (3) ◽

pp. 1295-1310

Author(s):

Jason W Reed ◽

Rangasamy P Elumalai ◽

Joanne Chory

Keyword(s):

Arabidopsis Thaliana ◽

Cell Elongation ◽

Hypocotyl Elongation ◽

Light Signaling ◽

Ambient Light ◽

Phytochrome B ◽

Light Responses ◽

Genetic Analyses ◽

Control Light

Abstract Ambient light controls the development and physiology of plants. The Arabidopsis thaliana photoreceptor phytochrome B (PHYB) regulates developmental light responses at both seedling and adult stages. To identify genes that mediate control of development by light, we screened for suppressors of the long hypocotyl phenotype caused by a phyB mutation. Genetic analyses show that the shy (short hypocotyl) mutations we have isolated fall in several loci. Phenotypes of the mutants suggest that some of the genes identified have functions in control of light responses. Other loci specifically affect cell elongation or expansion.

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Effect of circularly polarized light on germination, hypocotyl elongation and biomass production of arabidopsis and lettuce: Involvement of phytochrome B

Plant Biotechnology ◽

10.5511/plantbiotechnology.19.1219a ◽

2020 ◽

Vol 37 (1) ◽

pp. 57-67

Author(s):

Enkhsukh Lkhamkhuu ◽

Kazunori Zikihara ◽

Hitomi Katsura ◽

Satoru Tokutomi ◽

Takafumi Hosokawa ◽

...

Keyword(s):

Biomass Production ◽

Polarized Light ◽

Hypocotyl Elongation ◽

Phytochrome B ◽

Circularly Polarized Light ◽

Circularly Polarized

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Photobody Localization of Phytochrome B Is Tightly Correlated with Prolonged and Light-Dependent Inhibition of Hypocotyl Elongation in the Dark

PLANT PHYSIOLOGY ◽

10.1104/pp.114.236661 ◽

2014 ◽

Vol 165 (2) ◽

pp. 595-607 ◽

Cited By ~ 32

Author(s):

Elise K. Van Buskirk ◽

Amit K. Reddy ◽

Akira Nagatani ◽

Meng Chen

Keyword(s):

Hypocotyl Elongation ◽

Phytochrome B ◽

Dependent Inhibition

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Cryptochrome 1 interacts with PIF4 to regulate high temperature-mediated hypocotyl elongation in response to blue light

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1511437113 ◽

2015 ◽

Vol 113 (1) ◽

pp. 224-229 ◽

Cited By ~ 142

Author(s):

Dingbang Ma ◽

Xu Li ◽

Yongxia Guo ◽

Jingfang Chu ◽

Shuang Fang ◽

...

Keyword(s):

High Temperature ◽

Blue Light ◽

Abiotic Factors ◽

Hypocotyl Elongation ◽

Dependent Manner ◽

Phytochrome B ◽

Environmental Signals ◽

Blue Light Receptor ◽

Light Inhibition ◽

Cryptochrome 1

Cryptochrome 1 (CRY1) is a blue light receptor that mediates primarily blue-light inhibition of hypocotyl elongation. Very little is known of the mechanisms by which CRY1 affects growth. Blue light and temperature are two key environmental signals that profoundly affect plant growth and development, but how these two abiotic factors integrate remains largely unknown. Here, we show that blue light represses high temperature-mediated hypocotyl elongation via CRY1. Furthermore, CRY1 interacts directly with PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) in a blue light-dependent manner to repress the transcription activity of PIF4. CRY1 represses auxin biosynthesis in response to elevated temperature through PIF4. Our results indicate that CRY1 signal by modulating PIF4 activity, and that multiple plant photoreceptors [CRY1 and PHYTOCHROME B (PHYB)] and ambient temperature can mediate morphological responses through the same signaling component—PIF4.

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