posted on 2021-02-18, 12:33authored byMuhammad Junaid Rao, Umair Ahmed, Muhammad Husnain Ahmed, Mingzhen Duan, Jibin Wang, Yanting Wang, Lingqiang Wang
Secondary
metabolites perform diverse ecological functions in plants,
providing defense against abiotic and biotic stresses and acting as
a powerful antioxidant agent. The level of metabolites in each organ
or tissue changes with time and the developmental stage of the plant,
which determines its response to stress. However, few studies of the
secondary metabolites of sugarcane, a major global crop, have been
reported. This study focuses on the primary and secondary metabolites
and their antioxidant activities in new and mature leaf blades of
12 sugarcane varieties. We observed that levels of primary metabolites
such as amino acids, total glucose contents, and carbohydrates were
higher in the young leaves than in mature leaves; in contrast, the
mature sugarcane leaves showed a higher level of synthesis of secondary
metabolites (such as phenolics, flavonoids, etc.) compared to that
of new leaves. Interestingly, the antioxidant activities were higher
in mature leaves than in new leaves. The mature leaves of Taitang172
and ROC22 possess a high total flavonoid content, and these varieties
showed maximum antioxidant activities among 12 sugarcane varieties.
This study provides a broad snapshot of secondary metabolites and
their antioxidant activities in (new and mature leaves) different
sugarcane varieties. It enhances our understanding of the metabolic
localization in different leaf tissues. We speculate that exploring
the metabolome through qualitative and quantitative profiling enables
a more comprehensive examination of foliar metabolites.