Involvement of rice cryptochromes in de-etiolation responses and flowering.
TLDR
Oscry1s are responsible for regulating blue light-mediated de-etiolation in rice, and OsCRY2 antisense transgenic rice flowered later than WT under both long-day and short-day conditions, indicating that Oscry2 is involved in the promotion of flowering time in rice.Abstract:
In order to elucidate the function of cryptochromes (cry) in rice, we have characterized all rice CRY genes, including OsCRY1a, OsCRY1b and OsCRY2. Our studies revealed that OsCRY1 genes were mainly expressed in the green plant tissue, while OsCRY2 gene expression was high in the coleoptile, flower and callus. Light treatment affected neither the expression of any of the OsCRY genes nor the stability of their transcripts. However, it was found that Oscry2 protein was negatively regulated by blue light. Moreover, the level of Oscry2 protein also decreased upon red light treatment, and this red light-dependent degradation was shown to be mediated by phytochrome B. Overexpression of OsCRY1 genes resulted in an increased responsiveness to blue light when measuring coleoptile growth inhibition. Moreover, growth of leaf sheaths and blades was also repressed more in OsCRY1 overexpressers than in wild type (WT) under blue light conditions. These results suggest that Oscry1s are responsible for regulating blue light-mediated de-etiolation in rice. In addition, OsCRY2 antisense transgenic rice flowered later than WT under both long-day and short-day conditions, indicating that Oscry2 is involved in the promotion of flowering time in rice.read more
Citations
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The Cryptochrome Blue Light Receptors
TL;DR: It is hypothesized that photons excite electrons of the flavin molecule, resulting in redox reaction or circular electron shuttle and conformational changes of the photoreceptors, which alters gene expression at both transcriptional and posttranslational levels and consequently the metabolic and developmental programs of plants.
Journal ArticleDOI
Cryptochrome signaling in plants.
TL;DR: Recent advances in functional and mechanism characterization of cryptochromes in plants including pea and tomato and lower plants including moss and fern are focused on.
Journal ArticleDOI
The interplay between light and jasmonate signalling during defence and development
Kemal Kazan,John M. Manners +1 more
TL;DR: Recent research that revealed new mechanistic insights into how plants might integrate light and jasmonate signals to modify their growth and development, especially when defending themselves from either pests, pathogens, or encroaching neighbours, is discussed.
Journal ArticleDOI
Phytochrome B regulates Heading date 1 (Hd1)-mediated expression of rice florigen Hd3a and critical day length in rice.
Ryo Ishikawa,Mayumi Aoki,Ken-ichi Kurotani,Ken-ichi Kurotani,Shuji Yokoi,Shuji Yokoi,Tomoko Shinomura,Tomoko Shinomura,Makoto Takano,Ko Shimamoto +9 more
TL;DR: It is reported that phytochrome B (phyB)-mediated suppression of Hd3a is a primary cause of long-day suppression of flowering in rice, based on the three complementary discoveries.
Journal ArticleDOI
Mechanisms of Cryptochrome-Mediated Photoresponses in Plants.
Qin Wang,Chentao Lin +1 more
TL;DR: These two mechanisms enable cryptochromes to integrate blue-light signals with other internal and external signals to optimize plant growth and development.
References
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Hd1, a Major Photoperiod Sensitivity Quantitative Trait Locus in Rice, Is Closely Related to the Arabidopsis Flowering Time Gene CONSTANS
Masahiro Yano,Yuichi Katayose,Motoyuki Ashikari,Utako Yamanouchi,Lisa Monna,Takuichi Fuse,Tomoya Baba,Kimiko Yamamoto,Yosuke Umehara,Yoshiaki Nagamura,Takuji Sasaki +10 more
TL;DR: It is suggested that Hd1 functions in the promotion of heading under short- day conditions and in inhibition under long-day conditions and is a homolog of CONSTANS in Arabidopsis.
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Frederico. Valverde,Aidyn Mouradov,Wim J. J. Soppe,Dean Ravenscroft,Alon Samach,George Coupland +5 more
TL;DR: It is shown that light stabilizes nuclear CO protein in the evening, whereas in the morning or in darkness the protein is degraded by the proteasome.
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HY4 gene of A. thaliana encodes a protein with characteristics of a blue-light photoreceptor
TL;DR: The hy4 mutant5 is one of several mutants that are selectively insensitive to blue light during the blue-light-dependent inhibition of hypocotyl elongation response, which suggests that they lack an essential component of the cryptochrome-associated light-sensing pathway.
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A genetic and physiological analysis of late flowering mutants in Arabidopsis thaliana.
TL;DR: A differential response of the mutants to environmental factors and their subdivision into epistatic groups is discussed in relation to a causal model for floral initiation in Arabidopsis thaliana.