| Categories genes  | Tags starch biosynthesis  meristem  seed  shoot  phytohormone  cytokinin  endosperm  salinity  resistant  starch  cell cycle  leaf  salt  tolerance  salt stress  stress  dwarf  stress tolerance 
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    • No correlation between sucrose synthase activity and starch biosynthesis was seen in these mutants, although slight elevations of RSs1 transcript levels were observed
    • We previously showed that the rice protein RSS1, whose stability is regulated depending on the cell cycle phases, is a key factor for the maintenance of meristematic activity under stressful conditions
    • Molecular characterization of the rice protein RSS1 required for meristematic activity under stressful conditions
    • RSs1 was expressed predominantly in the endosperm of milky stage rice seeds with maximum expression at 3~5 days after pollination which were 8~10-fold over leaf levels
    • Cloning and expression of rice (Oryza sativa) sucrose synthase 1 (RSs1) in developing seed endosperm
    • Here we show that RSS1 interacts with all the PP1 expressed in the shoot apex of rice
    • These effects of RSS1 are exerted by regulating the G1-S transition, possibly through an interaction of RSS1 with protein phosphatase 1, and are mediated by the phytohormone, cytokinin
    • ) sucrose synthase 1 (RSs1) was used to determine spatial expression of the gene in rice tissues and temporal expression in developing rice endosperm
    • Here we show that a rice protein, RSS1, whose stability is controlled by cell cycle phases, contributes to the vigour of meristematic cells and viability under salinity conditions
    • RSS1 regulates the cell cycle and maintains meristematic activity under stress conditions in rice
    • Interestingly, the recombinant RSS1 protein is highly resistant to heat with respect to its anti-coagulability and binding activity to PP1
    • RSs1 transcript and activity levels were analyzed in two starch deficient mutants of rice to determine if the lesion in these mutants resides at the locus for RSs1
    • The wheat TdRL1 is the functional homolog of the rice RSS1 and promotes plant salt stress tolerance.
    • Finally, when expressed in the rice rss1 mutant, TdRL1 suppressed its dwarf phenotype upon salt stress, confirming that both proteins are true functional homologs required for salt stress tolerance in cereals
    • To further understand their function, we performed a computational analysis to compare RSS1 and TdRL1 co-expression networks revealing common gene ontologies, among which those related to cell cycle progression and regulation of microtubule (MT) networks were over-represented
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