Levels of endogenous sugars, transcripts of rbcS and rbcL, and of RuBisCO protein in senescing sunflower [Helianthus annuus] leaves

Sugar content, transcript levels of rbcS and rbcL, and ribulose-1.5-bisphosphate carboxylase/oxygenase (RuBisCO) content were measured in the first leaves of sunflower plants grown under high light and low nitrogen supply. After the peak level of the photosynthetic activity was attained, photosyntha...

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Bibliographic Details
Published in:Plant and cell physiology 1997, Vol.38 (9), p.1032-1038
Main Authors: Ono, K. (Tokyo Univ. (Japan)), Watanabe, A
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
AVEJENTAMIENTO
AZUCARES
Biological and medical sciences
biosynthesis
Carbohydrate
CONTENIDO DE NITROGENO
Economic plant physiology
enzyme activity
EXPRESION GENICA
EXPRESSION DES GENES
FEUILLE
FOTOSINTESIS
Fundamental and applied biological sciences. Psychology
GENE EXPRESSION
genes
genetic regulation
Growth and development
HELIANTHUS ANNUUS
HOJAS
INHIBICION
INHIBITION
LEAVES
Morphogenesis, differentiation, rhizogenesis, tuberization. Senescence
NITROGEN CONTENT
PHOTOSYNTHESE
PHOTOSYNTHESIS
Plant physiology and development
protein composition
quantitative analysis
rbcL
rbcS
REGLAMENTACIONES
REGLEMENTATION
REGULATIONS
ribulose-bisphosphate carboxylase
RUBISCO
RuBisCO (EC 4.1.1.39 )
SENESCENCE
Senescence and abscission
SUCRES
SUGARS
Sunflower (Helianthus annuus L.)
TENEUR EN AZOTE
transcription (genetics)
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:Sugar content, transcript levels of rbcS and rbcL, and ribulose-1.5-bisphosphate carboxylase/oxygenase (RuBisCO) content were measured in the first leaves of sunflower plants grown under high light and low nitrogen supply. After the peak level of the photosynthetic activity was attained, photosynthates accumulated, and the photosynthetic activity decreased. When these plants were supplied with high nitrogen, the sugar content decreased, and the transcript level of rbcs increased. Subsequently, the amount of RuBisCO increased. To decrease the leaf sugar level without changing the nitrogen supply, we applied DCMU, an inhibitor of photosynthesis, to the first leaves of the plants. This treatment also increased the transcript level of rbcS and suppressed the decrease in RuBisCo. These results indicate that sugar repression of rbcS may play a role in the early phases of leaf senescence under nitrogen deficiency
ISSN:0032-0781
1471-9053
DOI:10.1093/oxfordjournals.pcp.a029268