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Subject: Biochemistry × Author: Aggarwal, Nidhi × Start date: 2021 × Type: Thesis ×
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    ThesisItemOpen Access
    Sugar metabolism of apical and basal ends of potato tuber during post-harvest storage
    (Punjab Agricultural University, Ludhiana, 2021) Aggarwal, Nidhi; Zhawar, Vikramjit Kaur
    Sugar metabolism was studied in apical and basal ends of tubers during storage at 4° and 25° C in four potato (Solanum tuberosum L.) genotypes Lady Rosetta (LR), Kufri Sindhuri (KS), MP/04 578 (MP), MS/8 1148 (MS) where LR was cold-induced sweetening (CIS)-resistant, more dormant, having quality storage, MP was cold-resistant but poor in quality storage, KS and MS were CIS-susceptible, MS was also low dormant genotype. Results showed that LR maintains high sucrose to hexose ratio, sucrose phosphate synthase (SPS), sucrose synthase in synthetic direction (SuSy-S), UDP-glucose phosphorylase (UGPase), soluble invertases, starch, and low amylases, starch phosphorylase (SP), sucrose synthase in breakdown direction (SuSyB), cell wall invertases, thus showing starch/sucrose metabolism oriented more towards synthetic direction than breakdown during storage at both 4° and 25° C. MS keeps all enzymes high except vacuolar invertases during storage at both 25° and 4° thus showing overall high metabolic activity oriented both to synthetic and catabolic modes, this may be due to its low dormant feature. KS showed cold sensitivity due to high induction of amylases and loss of starch at 4° than 25° C and genotype was also poor in sucrose/starch synthetic activities during cold storage. Cold resistance of MP related to low induction of amylases at 4° than 25° and high starch levels and also maintains high starch synthetic activity in the form of AGPase during cold storage but genotype was found very poor in sucrose to hexose ratio and sucrose synthetic activities. Overall analysis showed that orientation of both starch and sucrose metabolism towards synthesis than breakdown in tubers during storage may be important for CIS-resistance and quality storage.