Impact of carbon and nitrogen metabolism on grain filling in quinoa
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation was carried out to study the impact of carbon and nitrogen
metabolism in quinoa genotypes IC411824, IC411825, EC507747 and EC507742 during pre
anthesis, anthesis and post anthesis period at different days after sowing (DAS). It was
observed that activities of acid invertase, sucrose synthase (cleavage) and sucrose phosphate
synthase (SPS) increased up to 75 DAS and this might be responsible for providing reducing
sugars for the development of vegetative parts. Increased activities of acid invertase, sucrose
synthase (cleavage) and sucrose phosphate synthase from 75 to 90 DAS of inflorescence in
quinoa genotypes might be responsible for the assimilation of carbohydrates needed for the
development of seeds during post-anthesis period. The activities of acid invertase and sucrose
synthase (cleavage) were observed to be maximum in seeds of quinoa genotypes at 110 DAS
and decreased with the progression of seed development and were found to be minimum near
seed maturity at 124 DAS. Enhanced activities of nitrate reductase, glutamate synthase,
glutamine synthtase during vegetative growth of leaves and stem at 90 DAS assists the
fixation of ammonia on glutamate molecule to synthesize amino acids at early stages.
However, the glutamate dehydrogenase and nitrite reductase had significant role in the re-
assimilation of amides from the amino group of asparginase at 90 DAS of inflorescence and
124 DAS of seed maturity. Photosynthetic products like glucose and sucrose provide both the
energy and the C-skeletons for ammonium assimilation during amino acid biosynthesis.
Carbohydrate composition, free radical scavenging activity and phenolics were observed to
be maximum during post anthesis period of seed development in quinoa genotypes.
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Citation
Sonali (2021). Impact of carbon and nitrogen metabolism on grain filling in quinoa (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.