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Relationships among carbon isotope composition, growth, and foliar nitrogen in soybean

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Title Relationships among carbon isotope composition, growth, and foliar nitrogen in soybean
Not Available
 
Creator Not Available
Miles W. Ingwers,
Clinton J. Steketee,
Sushil K. Yadav
Zenglu Li
 
Subject carbon isotope composition
foliar nitrogen
soybean
 
Description Not Available
Interactions between carbon isotope composition (δ13C), foliar
nitrogen concentration (foliar N), and biomass accumulation
(growth) merit further investigation in soybean (Glycine max
(L.) Merr.) and other species as these metrics may be valuable
for assessing moisture stress and for screening of droughtresistant
varieties. To this end, we examined the response of
six soybean genotypes to water-deficit stress in a greenhouse
study. Two treatments were imposed: low soil moisture (5–10%
volumetric water content) and high soil moisture (30–38%
volumetric water content). Above-ground biomass accumulation,
foliar N, and δ13C were measured at the end of the
experiment. Leaf water potential and midday gas exchange
(net assimilation, stomatal conductance, and transpiration)
were measured multiple times throughout the experiment.
All measurements were affected by water-deficit stress.
Significant, but weak, positive relationships were found
between δ13C and biomass accumulation in both soil moisture
treatments. Foliar N was significantly, but weakly, correlated to
growth in the high soil-moisture treatment, but not in the low
soil-moisture treatment. The data suggest that selection for
genotypes with higher δ13C values could result in improved
biomass accumulation. The relationship between foliar N and
δ13C was negative under high soil-moisture conditions and
positive under low soil-moisture conditions. The relationships
between δ13C and foliar N could be a highly informative metric
to help understand the effects of water-deficit stress and may
further indicate whether water or nitrogen acquisition is limiting
in a specific environment, which should help in breeding
improved soybean cultivars.
Not Available
 
Date 2021-08-17T08:46:19Z
2021-08-17T08:46:19Z
2021-04-04
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/57569
 
Language English
 
Relation Not Available;
 
Publisher Not Available