Artemisia annua accumulates substantial quantities of unique and highly useful antimalarial sesquiternoid artemisinin and related phytomolecules as well as its characteristic essential oil in its glandular trichomes. The phytomolecules are mainly produced in its leaves and inflorescences. Artemisia annua plants were grown under NaCl salinity (50, 100 and 200 mM) stress conditions imposed throughout the entire life cycle of the plant. Results revealed that specialized metabolites like artemisinin, arteannuin-B, artemisinic acid + dihydroartemisinic acid and essential oil accumulation were positively modulated by NaCl salinity stress. Interestingly, total content of monoterpenoids and sesquiterpenoids of essential oil was induced by NaCl salinity treatment, contrary to previous observations. Production of camphor, the major essential oil constituent was induced under the influence of treatment. The metabolic acclimation and manifestations specific to terpenoid pathway are analysed vis-a-vis vegetative to reproductive periods and control of the modulation. WRKY and CYP71AV1 play a key role in mediating the responses through metabolism in glandular trichomes. The distinctness of the salinity induced responses is discussed in light of differential mechanism of adaptation to abiotic stresses and their impact on terpenoid-specific metabolic adjustments in A. annua. Results provide potential indications of possible adaptation of A. annua under saline conditions for agrarian techno-economic benefaction.
Staling impacts bud-sett moisture and nutrients like sucrose and reducing sugar contents of seed cane/setts. With increase in staling time bud and sett moisture, sucrose % juice decreased whereas total soluble solids and reducing sugars increased. Germination % ( at 45 DAP) and fresh weight of settlings (at 55 DAP) decreased with increasing staling time. Bud moisture affected germination and fresh weight of settlings more than the sett moisture. These growth parameters were positively influenced by sucrose content and negatively by reducing sugars and total soluble solids ( o Brix).The negative influence of the total solids could be due to non-sugars like phenolics, etc.
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