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Cytokinins: activity, biosynthesis, and translocation.
TLDR
Recent findings on the relationship between CK structural variation and activity, distinct features in CK biosynthesis between higher plants and Agrobacterium infected plants, CK translocation at whole-plant and cellular levels, and CKs as signaling molecules for nutrient status via root-shoot communication are summarized.
Cytokinin Oxidase Regulates Rice Grain Production
TLDR
It is shown that a QTL that increases grain productivity in rice, Gn1a, is a gene for cytokinin oxidase/dehydrogenase (OsCKX2), an enzyme that degrades the phytohormone cytokinIn.
PSEUDO-RESPONSE REGULATORS 9, 7, and 5 Are Transcriptional Repressors in the Arabidopsis Circadian Clock[W][OA]
TLDR
The results suggest that the repressor activities of PRR9, PRR7, and PRR5 on the CCA1 and LHY promoter regions constitute the molecular mechanism that accounts for the role of these proteins in the feedback loop of the circadian clock.
DWARF10, an RMS1/MAX4/DAD1 ortholog, controls lateral bud outgrowth in rice.
TLDR
It is shown that the concept of apical dominance can be applied to tiller bud outgrowth of rice and observations that suggest that FINE CULM1 (FC1), a rice ortholog of teosinte branched 1 (tb1), possibly works independently of the branching inhibitor pathway.
The ethylene response factors SNORKEL1 and SNORKEL2 allow rice to adapt to deep water
TLDR
It is demonstrated that the introduction of three quantitative trait loci from deepwater rice into non-deepwater rice enabled the latter to become deepwater Rice, and will contribute to rice breeding in lowland areas that are frequently flooded during the rainy season.
Dynein structure and power stroke
Dynein ATPases are microtubule motors that are critical to diverse processes such as vesicle transport and the beating of sperm tails; however, their mechanism of force generation is unknown. Each
Delayed leaf senescence induces extreme drought tolerance in a flowering plant
Drought, the most prominent threat to agricultural production worldwide, accelerates leaf senescence, leading to a decrease in canopy size, loss in photosynthesis and reduced yields. On the basis of
Direct control of shoot meristem activity by a cytokinin-activating enzyme
TLDR
The fine-tuning of concentrations and the spatial distribution of bioactive cytokinins by a cytokinin-activating enzyme as a mechanism that regulates meristem activity is proposed.
Arabidopsis CYP735A1 and CYP735A2 Encode Cytokinin Hydroxylases That Catalyze the Biosynthesis of trans-Zeatin*
TLDR
Root-specific induction of CYP735A2 expression by CK suggests that the trans-hydroxylation is involved in the regulation of CK metabolism and signaling in roots.
AtIPT3 is a key determinant of nitrate-dependent cytokinin biosynthesis in Arabidopsis.
TLDR
It is suggested that nitrogen availability differentially regulates expression of At IPT3 and AtIPT5, and that AtIPt3 is a key determinant of cytokinin biosynthesis in response to rapid changes in the availability of NO(3)(-).
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