2011
DOI: 10.1007/s12298-011-0061-y
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Nitrate assimilation in contrasting wheat genotypes

Abstract: The plants grown in natural conditions do not express their full potential of nitrogen (N) utilization due to limiting availability of N at later stages of growth. There is a likelihood of manifesting their full potential under non limiting nitrogen supply. In our earlier studies with 15 day old seedlings, it has been shown that high nitrate reductase (HNR) genotype with higher efficiency of the enzymes of the nitrate assimilatory pathway resulted in higher potential of this genotype for N utilization as compa… Show more

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Cited by 15 publications
(14 citation statements)
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“…Our results showed that KNO 3 source significantly increased the activities of nitrogen metabolizing enzymes and aminotransferases as also reported by Jain et al (2011);Anjana et al (2011);Asthir and Bhatia (2014);Hawkesford (2014). Whereas, NH 4 Cl elevated activities of GS-GOGAT and aminotransferases (GOT and GPT) along with increase in acid and neutral invertase activities in shoot as well as in root which indicated that unregulated uptake of ammonium supplied as a single nitrogen source is considered to exert a carbon stress on plant roots for its assimilation and subsequent translocation to shoots (Lewis et al 1987;Britto and Kronzucker 2002).…”
Section: Discussionsupporting
confidence: 90%
“…Our results showed that KNO 3 source significantly increased the activities of nitrogen metabolizing enzymes and aminotransferases as also reported by Jain et al (2011);Anjana et al (2011);Asthir and Bhatia (2014);Hawkesford (2014). Whereas, NH 4 Cl elevated activities of GS-GOGAT and aminotransferases (GOT and GPT) along with increase in acid and neutral invertase activities in shoot as well as in root which indicated that unregulated uptake of ammonium supplied as a single nitrogen source is considered to exert a carbon stress on plant roots for its assimilation and subsequent translocation to shoots (Lewis et al 1987;Britto and Kronzucker 2002).…”
Section: Discussionsupporting
confidence: 90%
“…Similarly EC inhibited nitrate uptake in loblolly pine grown on low nitrate, whereas uptake was stimulated when plants were grown on high nitrate (Larigauderie et al 1994). Nitrate uptake has been subjected to feedback regulation and is found to be inhibited by prolonged incubation with nitrate (Jain et al 2011). Feedback effects may be mediated by nitrate itself or by certain amino acids or ammonium.…”
Section: Resultsmentioning
confidence: 97%
“…In wheat, assimilate supply in the form of N is never a limiting factor rather its controlled utilization is a major phenomenon linked to grain activity as sink (Asthir and Bhatia, 2014). Enzyme activities were assayed in the flag leaves as they contribute towards grain filling and Table 6: Effect nitrogen application on plant height, grain yield, yield-related traits and total biomass of different wheat genotypes GLU 1101 85a 82a 91c 90a 57ab 83cd 86b 102a 15ab 15ab 17b 18b GLU 1356 84ab 87c 83ab 88a 80b 80ab 100a 109ab 17bc 18b 18ab 18ab GLU 2001 80b 84bc 80a 87ab 50a 93d 94a 105ab 16c 17ab 17ab 18a GLU 700 86a 87a 96ab 98a 62a 71bc 97ab 102ab 15abc 15a 16ab 19ab PH132-4836 81ab 85b 88a 89ab 69ab 84abc 94ab 99b 15abc 16ab 17ab 17a PH132-4840 85b 81ab 86ab 88b 55a 76a 77a 82a 16a 16ab 16a grain N status throughout maturity of the plants (Jain et al, 2011). Earlier reports using maize as a model plant, revealed a decreasing trend of N uptake and assimilation at leaf ageing and that the decrease was enhanced when plants were N starved (Hirel et al, 2005).…”
Section: Discussionmentioning
confidence: 99%