Journal
PLANTS-BASEL
Volume 12, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/plants12142612
Keywords
glutamate dehydrogenase; heterozygous; homozygous; kernel yield; maize; metabolome; mutant
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The agronomic potential of glutamate dehydrogenase 2 (GDH2) in maize kernel production was investigated by examining the impact of a mutation on the corresponding gene. Heterozygous gdh2 mutant plants showed a decrease in root amino acid content and an increase in phenolic compounds in leaves. The heterozygous gdh2 mutant lines exhibited a 30 to 40% increase in kernel yield over two years of field cultivation.
The agronomic potential of glutamate dehydrogenase 2 (GDH2) in maize kernel production was investigated by examining the impact of a mutation on the corresponding gene. Mu-insertion homozygous and heterozygous mutant lines lacking GDH2 activity were isolated and characterized at the biochemical, physiological and agronomic levels. In comparison to the wild type and to the homozygous ghd2 mutants, the heterozygous gdh2 mutant plants were characterized by a decrease in the root amino acid content, whereas in the leaves an increase of a number of phenolic compounds was observed. On average, a 30 to 40% increase in kernel yield was obtained only in the heterozygous gdh2 mutant lines when plants were grown in the field over two years. The importance of GDH2 in the control of plant productivity is discussed in relation to the physiological impact of the mutation on amino acid content, with primary carbon metabolism mostly occurring in the roots and secondary metabolism occurring in the leaves.
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