Journal ArticleDOI
Inhibition of Leaf Senescence by Autoregulated Production of Cytokinin
Susheng Gan,Richard M. Amasino +1 more
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TLDR
This result demonstrates that endogenously produced cytokinin can regulate senescence and provides a system to specifically manipulate the senescences program.Abstract:
Controlling expression of IPT, a gene encoding isopentenyl transferase (the enzyme that catalyzes the rate-limiting step in cytokinin biosynthesis), with a senescence-specific promoter results in the suppression of leaf senescence. Transgenic tobacco plants expressing this chimeric gene do not exhibit the developmental abnormalities usually associated with IPT expression because the system is autoregulatory. Because sufficient cytokinin is produced to retard senescence, the activity of the senescence-specific promoter is attenuated. Senescence-retarded leaves exhibit a prolonged, photosynthetically active life-span. This result demonstrates that endogenously produced cytokinin can regulate senescence and provides a system to specifically manipulate the senescence program.read more
Citations
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Cytokinin-Deficient Transgenic Arabidopsis Plants Show Multiple Developmental Alterations Indicating Opposite Functions of Cytokinins in the Regulation of Shoot and Root Meristem Activity
TL;DR: The results are consistent with the hypothesis that cytokinins have central, but opposite, regulatory functions in root and shoot meristems and indicate that a fine-tuned control of catabolism plays an important role in ensuring the proper regulation of cytokinin functions.
Journal ArticleDOI
CYTOKININS: Activity, Biosynthesis, and Translocation
TL;DR: 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.
Journal ArticleDOI
What it will take to feed 5.0 billion rice consumers in 2030.
TL;DR: The availability of the rice genome sequence will now permit identification of the function of each of 60,000 rice genes through functional genomics, and it will be possible to develop new rice varieties by introduction of the gene through traditional breeding in combination with marker aided selection or direct engineering of genes into rice varieties.
Journal ArticleDOI
Hormone balance and abiotic stress tolerance in crop plants
Zvi Peleg,Eduardo Blumwald +1 more
TL;DR: The characterization of the molecular mechanisms regulating hormone synthesis, signaling, and action are facilitating the modification of hormone biosynthetic pathways for the generation of transgenic crop plants with enhanced abiotic stress tolerance.
Journal ArticleDOI
Regulation of plant growth by cytokinin
TL;DR: It is suggested that cytokinins are an important regulatory factor of plant meristem activity and morphogenesis, with opposing roles in shoots and roots.
References
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Robert B. Horsch,J. E. Fry,Nancy L. Hoffmann,Marco Wallroth,David Alan Eichholtz,Stephen G. Rogers,Robert T. Fraley +6 more
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Journal ArticleDOI
Molecular analysis of natural leaf senescence in Arabidopsis thaliana
TL;DR: It is shown that major changes in gene expression occur in Arabidopsis leaves during the process of senescence, and that these changes are accompanied by a specific pattern of decline of total RNA and proteins.
Journal ArticleDOI
Delayed Leaf Senescence in Tobacco Plants Transformed with tmr, a Gene for Cytokinin Production in Agrobacterium.
TL;DR: It is demonstrated that plant morphology and leaf senescence can be manipulated by changing the endogenous level of cytokinin, which encodes the enzyme isopentenyl transferase, which catalyzes the initial step in cytokinIn biosynthesis.
Journal ArticleDOI
Altered morphology in transgenic tobacco plants that overproduce cytokinins in specific tissues and organs.
TL;DR: The tissue- and organ-specific overproduction of cytokinins produced a number of morphological and physiological changes, including stunting, loss of apical dominance, reduction in root initiation and growth, and adventitious shoot formation from unwounded leaf veins and petioles, altered nutrient distribution, and abnormal tissue development in stems.
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